Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Kinetics and Isotherm Studies of the Immobilized Lipase on Chitosan Support1319133172800ENGhasem NajafpourBiochemical & Chemical Engineering, Noshirvani University of Technology, Babol0000-0001-9505-7146Journal Article19700101The kinetics and isotherm studies of the immobilized lipase and the mechanism of immobilization on chitosan beads and activated chitosan beads with glutaraldehyde were investigated. The effect of glutaraldehyde on porosity of chitosan was evaluated by FESEM analysis. It was observed that the porosity of the carrier which has activated by glutaraldehyde was substantially increased. The validity of experimental data fitted to Langmuir, Freundlich, Hill, Sips, Temkin, Redlich-Paterson and Dubini-Radushkevich isotherm models for both immobilization methods were examined. The isotherm models were compatible and confirmed immobilization techniques. Amongst the isotherm models have described experimental data, the best fit was obtained by Langmuir isotherm model for chitosan beads; which is consistent with the heterogeneous behavior of the adsorption sites on the chitosan structure. However, Freundlich isotherm model have corresponded immobilization of lipase on chitosan beads activated by glutaraldehyde so that it can reveal the multilayer adsorption. Also, pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion were studied by experimental results in different concentration of lipase. Pseudo-first order kinetic model were described immobilization of lipase on chitosan beads and corresponds to physical adsorption of enzyme on the carrier. While chitosan beads activated by glutaraldehyde have followed pseudo-second order kinetic model indicating chemical adsorption of enzyme on the carrier. In addition, intra-particle diffusion equation is properly fitted experimental data for both immobilization method with high regression coefficient.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001An Investigation on Stability, Electrical and Thermal Characteristics of Transformer Insulting Oil Nanofluids1332134072801ENMehdi Akbarichem eng, ACER, University of TehranMahdieh Yavarichem eng, ACER, University of TehranNasrin Nematichem eng, Shiraz UniversityJaber Babaee Darbandchem eng, ACER, University of TehranHoda Molavichemistry and materials, Niroo research instituteMonireh Asefichem eng, University of TehranJournal Article19700101Transformer insulating oil nanofluid is made to improve dielectric and thermal properties of the oil by employing nanoparticles with proper properties. In the current work, nanofluids based on transformer mineral oil were prepared by three procedures using diamond nanoparticles with high thermal conductivity, as well as high dielectric properties. It was tried to consider the impacts of surfactants’ presence and ball milling process in the preparation procedures. The effects of a variety of stabilizers (the amount and type) and also the ultrasonic time on diamond nanoparticles’ stability in the oil were investigated and optimized experimentally. Using the optimized nanofluids, thermal conductivity and viscosity of the oil nanofluids were compared and discussed. In addition, the consistency of the thermal conductivity results with Maxwell and also Hamilton and Crosser theoretical models was examined. It was revealed that, the nanofluid preparation procedure, temperature and nanoparticles’ concentration have effects on thermal conductivity of the transformer oil nanofluid, while the presence of the nanoparticles has a slight impact on the viscosity of the fluid. Also the effect of diamond nanoparticles’ presence on the electrical properties of transformer oil was studied. Based on the experimental results, adding diamond nanoparticles could lead to an increase in the transformer oil breakdown voltage, while it has nearly no effect on dielectric loss in low concentrations.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Synthesis and Characterization of Amine-modified Mesoporous SBA-15 for Carbon Dioxide Sequestration at High Pressure and Room Temperature (RESEARCH NOTE)1341134672802ENSamira SalehiChemistry, Iran University of Science and TechnologyMohammad Javad HabibiChemistry, IUSTMansoor AnbiaResearch Laboratory of Nanoporous Materials, Iran University of Science and TechnologyJournal Article19700101Amine-modified mesoporous SBA-15 adsorbent has been prepared by impregnation method using tetraethylenepentamine. The samples of this modified SBA-15 have been characterized by small angle X-ray scattering (SAXS), Scanning electron microscopy (SEM), Nitrogen adsorption-desorption isotherm and FT-IR. The adsorption capacity of CO2 on unmodified and modified samples were measured at high pressure (up to 20 bar) and room temperature and were 2.69, 4.02 and 3.62 mmol CO2/g for SBA-15, TEPA (55%)-SBA-15 and TEPA (65%)-SBA-15, respectively. The increment in the CO2 adsorption capacity of amine modified mesoporous material (TEPA (55%)-SBA-15) is attributed to the increased amine mass interaction with CO2. Further increase of amine content clogs the pores of the sorbent which results in slight reduction of CO2 adsorption in TEPA (65%)-SBA-15).Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Identification of Volatile Organic Compounds from Trichoderma virens (6011) by GC-MS and Separation of a Bioactive Compound via Nanotechnology1347135372803ENKamran RahnamaDepatement of Plant Protection, Gorgan University of Agricultural SciencesMohsen JahanshahiNanotechnology Research Institute, Babol Noshirvani University of TechnologySaeed NasrollanejadDepatement of Plant Protection, Gorgan University of Agricultural SciencesMohammad Hosein FatemiDepartment of Chemistry, Mazandaran UniversityMaede Shahiri TabarestaniDepartment of Plant Protection, Gorgan University of Agricultural Sciences & Natural ResourcesJournal Article19700101Fungal volatile organic compounds (VOCs) have the potential of being used as biocontrol agents for biotechnological applications in agriculture, industry and medicine. In this research, different VOCs from secondary metabolites of biocontrol fungus Trichoderma virens (6011) KP671477 were separated using n-hexane, n-butanol and methanol solvents and identified by gas chromatography–mass spectrometry (GC-MS) device. According to mass spectra library searching, more than 200 volatile compounds (with spectral match factor higher than 80%) such as alkanes, alkenes, alcohols, organic acids, aromatic compounds, aldehyde, etheric, esteric, phenolic, kenotic derivatives and, sulfur and nitrogen compounds, have been detected. Some of the VOCs such as di-butyl phthalate (DBP) had antifungal activity. The antifungal effect of DBP as a case study was checked and confirmed in in-vitro conditions. DBP as a bioactive compound was separated from secondary metabolites using Molecularly Imprinted Polymers (MIPs) as a solid sorbent. Two kinds of the MIPs were synthesized via bulk polymerization and precipitation polymerization. Nanoporous MIPs for DBP, with binding capacity ca.462 mg.g-1 and the specific surface area 479m2.g-1 were synthesized via bulk polymerization method while the synthesized MIPs via precipitation technique had the binding capacity ca.830 mg.g-1 with specific surface area 690 m2.g-1. The synthesized MIPs were evaluated by scan electron microscopy (SEM) device and Brunner Emmett-Teller (BET) analysis. Results showed that, the MIPs nanotechnology can be suggested as a suitable alternative method for separation of the chemical toxins. This study introduces a simple method under laboratory conditions to separate the bioactive compounds from fungal secondary metabolites.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Investigation of Generic House Components and Their Practical Ways to Be Assessed by House Buyers During Defect Liability Period in Malaysia1354136372804ENNorfarahayu KariyaDept. of Building and Construction Engineering, Universiti Tun Hussein Onn MalaysiaJournal Article19700101The newly built residential house basically had undergone a period where any defects toward the house will be rectified by the particular developer. Defect Liability Period (DLP) which commenced from the day of Vacant Possession (VP) by house owners generally in effect between eighteen (18) months and twenty four (24) months. During DLP, new house owner have the right to issue any complaints regarding the quality of the said building. Unfortunately, complaints were believed to widespread in the recent era where profitability is the main concerned for most of the developers. Since the quality of the finished product is of minor consideration, added with less knowledgeable new house owners on issues of house defect, the situation is going from bad to almost heedless. To add salt to the wound, scarcity on research and dissemination of knowledge were deemed to shut the issue until almost no existence. Therefore, the research is taking a leap by focusing on sense perceptions house components that received recurring complaints and provides corresponding practical ways to check for defects on behalf of new house owners. A mixed method of methodology has been imposed, starting with literature analysis, questionnaire survey, and structured interview, respectively. Questionnaire surveys were conducted using online distribution towards developers and contractors within southern states, namely; Johor, Melaka, and Negeri Sembilan. Meanwhile, the latter method was accomplished by interviewing several senior construction practitioners. In order to ease the analysis processes, SPSS, and NVivo were used as main software. Finally, the findings suggest that, sense perceptions, house components consist of several important parts such as roof, walls, and floors, along with their sub-components. However, not all components received similar trend of complaints from the house buyers. Further, interestingly, most of the senior construction practitioners proposed several unique and unaware practical ways for defect identification, such as by using torch light, water, and other simple testing methods. Last but certainly not least, the research embarks on application-based software as knowledge management and distribution effort, which is anchored on Android by Google Incorporation.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001New Analytic Method for Subgrade Settlement Calculation of the New Cement Fly-ash Grave Pile-slab Structure1364137172805ENDingbang ZhangSchool of civil Engineering, Hubei Polytechnic UniversityJournal Article19700101At present, reducing subgrade settlement of soft soil foundation is a key problem in high-speed railway construction. Pile-slab structure is a widely-utilized form of foundation structure to reduce the subgrade settlement in China. In order to save the engineering cost for high-speed railway construction in developing countries, the author developed a pile-slab structure and named it as the new CFG pile-slab structure. This work analyzed the settlement controlling effect of new CFG pile-slab structure and summarized two calculation methods on its subgrade settlement which are further formulated into an analytic method. Three methods were used to calculate the subgrade settlement of CFG pile-slab structure for a soft soil foundation in Chinese Shanghai-chengdu high-speed railway. The research showed that: (1)The settlement controlling effect of CFG pile-slab structure can satisfy the requirement of high-speed railway construction. (2) The new analytic method is proved to be more accurate and can reflect the mechanism of load transferring.Furthermore,the new analytic method can provide theoretical guidances for engineering designs and constructions of the CFG pile-slab structure.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Control Simulation and Experimental Verification of Maximum Power Point Tracking Based on RT-LAB (TECHNICAL NOTE)1372137972806ENKavin ZhangInternational Center of Scientific Research, International Center of Scientific ResearchJournal Article19700101The maximum power point tracking (MPPT) control in the Photovoltaic system is the key control technology, however present controller has the disadvantages of long development cycle, high cost and complex verification, and there are some disadvantages carrying out totally physical simulation or totally digital simulation of different control algorithms. This paper carried out design of hardware controller by researching different kinds of MPPT algorithms together with the improved MPPT algorithm, then digital-analog hybrid real-time simulation was carried out based on the digital main circuit using RT-LAB developed by Opal-RT company, effectiveness and superiority of the improved MPPT algorithm were verified in comparison with control effects of the improved MPPT algorithm and control effects of traditional MPPT algorithms.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Radio Frequency-micro Electromechanical System Switch with High Speed and Low Actuated Voltage1380138372807ENJavad YaghoubiElecterical Engineering, Babol University of TechnologyBahram Azizollah GanjiElectrical Engineering, Babol University of TechnologyJournal Article19700101This paper presents a novel RF MEMS (Micro Electromechanical System) fixed-fixed switch for very fast switching. Using the obtained equations, the switching time depends on the stiffness and effective mass of the switch beam so that the switching time will be decreased by higher stiffness (spring constant) and lower effective mass. In new design, the suspension bridge is a three-layer beam so that the middle layer is aluminum and outer layers are alumina. The reduced dimensions and three layers of beam cause to increase stiffness and reduce the mass of the beam. This led to increase the resonance frequency and as result, the switching time is reduced. The results show that, the switching time is 127 ns for the applied voltage of 27v and also the pull-in voltage is 18V. The return loss is 12 dB at frequency of 60 GHz that is desirable and the achieved results is better than the previous works. Thus, this switch is suitable for high frequency applications.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001A General Framework for 1-D Histogram-baesd Image Contrast Enhancement1384139172808ENSahar IravaniElectrical and Computer Engineering, Noshirvani University of Technology, BabolMehdi EzojiComputer & Electrical Engineering, Noshirvani University of Technology, BabolJournal Article19700101In this paper, a general framework for image contrast enhancement algorithm based on an optimization problem is presented. Through this optimization, the intensities can be better distributed. The algorithm is based on the facts that the histogram of the enhanced image is close to the input image histogram and uniform distribution, simultaneously. Based on this fact, we obtain a closed form optimal solution for the histogram of the enhanced image. Experimental results in a wide range of images demonstrate the high-performance of the proposed method.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Dynamic Modeling and Controller Design of Distribution Static Compensator in a Microgrid Based on Combination of Fuzzy Set and Galaxy-based Search Algorithm1392140072809ENHajar Bagheri TolabiEngineering, Islamic Azad University-Khorramabad BranchS.b.m Ayob, lorestan universityJournal Article19700101This paper presents a nonlinear controller for a Distribution Static Compensator (DSTATCOM) of a microgrid incorporating the Distributed Generation (DG) units. The nonlinear control has been designed based on partial feedback linearization theory and Proportional-Integral-Derivative (PID) controllers try to adjust the voltage and trace the output. This paper has proposed a combination of a fuzzy system and Galaxy-based Search Algorithm (GbSA) to optimize the parameters of the PID controllers. The results confirm that the characteristics of the response of the proposed controller (i.e. settling and rise times, the maximum overshoot and the steady-state error of the voltage step response of the DSTATCOM) is significantly improved by finding a high-quality solution. The proposed hybrid tuning method for the Partial Feedback Linearizing (PFL) controller concluded a better DC voltage regulation for the capacitor within the DSTATCOM. Furthermore, in the event of fault the proposed controller tuned by the fuzzy-GbSA method has shown a better performance in comparison with the conventional controller or controllers tuned by Genetic Algorithm (GA) or Particle Swarm Optimization (PSO) methods on both fault duration and after clearing times.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001The Reliable Hierarchical Location-allocation Model under Heterogeneous Probabilistic Disruptions1401141172810ENMohammad Saber Fallah NezhadIndusterial Engineering, Yazd UnivarsityNaeme ZarrinpoorIndusrial Engineering, Shiraz University of TechnologyMir Saman PishvaeeIndustrial Engineering, Iran University of Science and TechnologyJournal Article19700101This paper presents a novel reliable hierarchical location-allocation model where facilities are subject to the risk of disruptions. Based on the relationship between various levels of system, a multi-level multi-flow hierarchy is considered. The heterogeneous probabilistic disruptions are investigated in which the constructed facilities have different site-dependent and independent failure rates. In the occurrence of facility disruptions, to achieve system reliability, the mitigation operation is considered in such a way as to reassign the demand nodes to other operational facilities that can provide services. The problem is modeled from both cost and risk perspectives such that the fixed installation cost as well as the expected costs in normal disruption-free and disruptive conditions are minimized. A Benders decomposition algorithm is developed which seeks to find exact solution of the proposed model. Two efficient accelerating techniques including valid inequalities and knapsack inequalities are also proposed to expedite the convergence of solution procedure. The numerical results illustrate the applicability of the proposed model as well as the efficiency of the designed solution procedure.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001A Hybrid Dynamic Programming for Inventory Routing Problem in Collaborative Reverse Supply Chains1412142072811ENMitra MoubedIndustrial Engineering, Yazd universityYahia Yahia MehrjerdiDepartment of Industial Engineering, Faculty of En, Yazd UniversityJournal Article19700101Inventory routing problems arise as simultaneous decisions in inventory and routing optimization. In the present study, vendor managed inventory is proposed as a collaborative model for reverse supply chains and the optimization problem is modeled in terms of an inventory routing problem. The studied reverse supply chains include several return generators and recovery centers and one collection center. Since the mathematical model is an NP-hard one, finding the exact solution is time consuming and complex. A hybrid heuristic model combining dynamic programming, ant colony optimization and tabu search has been proposed to solve the problem. To confirm the performance of proposed model, solutions are compared with three previous researches. The comparison reveals that the method can significantly decrease costs and solution times. To determine the ant colony parameters, four factors and three levels are selected and the optimized values of parameters are defined by design of experiments.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Numerical Study of Interaction of Two Plane Parallel Jets1421143072812ENSaloua Marzoukenergy department, National Engineering School of MonastirHabib Ben Aissiaenergy department, National Engineering School of MonastirJacques JayCentre de Thermique de Lyon, INSA de Lyon, FranceNidhal Hnaienenergy department, National Engineering School of MonastirJournal Article19700101In the present work, a numerical simulation of two parallel turbulent jets was performed. The simulations were carried out by using the standard, the standard and the RSM models. A parametric study was also presented to determine the effect of the nozzles spacing and velocity ratio on the axial and transverse positions of the merge and combined points. Correlations between the various parameters governing this type of flow were also provided in this study. An investigation in the velocity ratio effect on the strong and weak jet spreading was also performed. Results show that the velocity ratio significantly affects the positions of the merge and combined points. Furthermore, increasing the velocity ratio favors the weak jet spreading while it decelerates that of the strong jet.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001On Numerical Investigation of Non-dimensional Constant Representing the Occurrence of Secondary Peaks in the Nusselt Distribution Curves1431144072813ENNITIN GULHANEMechanical Engg, VJTIUmair SiddiqueMechanical, Veermata jijabai technological institute0000-0003-1188-8423Journal Article19700101The Study of heat transfer augmentation in micro scale and electronic packaging systems are some of the paramount areas of the impending universe. In such systems the cooling of the heat sinks are generally achieved through the impingement of air jet. Assuming the air jet to be continues & incompressible fluid, the heat dissipation rate over the target surface seems to either uniform or well characterized in radial direction. In order to study the characteristic of heat dissipation rate, a graph of Nusselt number versus radial distance over the target surface is plotted. This is done at various injection and geometric parameters. The resulting trend of Nusselt profile manifests a gradual decrement in its magnitude with increase in the radial distance from the stagnation point. This is the property of characterized Nusselt distribution profile. In order to study the Nusselt distribution profile in more accurate sense, the present research takes an effort in numerically simulating the present geometry. A 2-D axis-symmetric geometric model is being proposed which consists of air (fluid) and aluminum (solid) as two vital computational domains. The computational simulations are being carried out using an appropriate turbulence model, in order to correctly predict the most accurate flow regime. This also enables the recording of necessary heat interactions. As far as the transition and intermediacy in the flow structure which occurs at target surface is concerned, prediction of accurate flow profile using commercial turbulence model becomes difficult. In order to predict these vital phenomenon, SST turbulence model along with Gamma – Theta transitional model is solved simultaneously in a commercial CFX solver. At lower nozzle - target spacing and higher impinging velocity, Nusselt distribution curve was observed to posses some unpredicted and localized secondary rise. The occurrence of such secondary peaks increases the magnitude of area average heat transfer rate. As per the survey, very less light is observed in the research areas of determining the exact cause and the intervening range for the occurrence of such peaks. Looking into this issue the current research focuses over the determination of the critical constant and its magnitude within which these peaks exists. The non dimensional constant representing the critical magnitude is defined as a ratio of diameter based Reynolds number with nozzle - target spacing (Z/d). While the corresponding critical magnitude was approximately investigated to be 6000. Not only that the present work takes an initiative in mapping the velocity contours at different values of this non dimensional constant. This enables a physical understanding of the flow profile at different impinging condition. A very contiguous observation of such contours demonstrates the occurrence of a transition region in the flow regime to be responsible for the origin of such peaksMaterials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Evaluation of Ductile Damage Criteria in Hot Forming Processes1441144972814ENFarhad Haji AboutalebiEngineering, university of EsfahanHossein AlijaniMechanical Eng., University of IsfahanJournal Article19700101The process of ductile fracture which occurs due to the accumulation, growth and combination of defects or cracks of material is called ductile damage. Failure in materials can be predicted, using damage mechanics and damage criteria. On the other hand, most of the materials depended to the manufacturing process, are formed in warm or hot conditions so that; the temperature also affects on the probable damage initiation. In this study, a number of conventional hot forming processes of aluminum alloys such as forming process by tail gas, hydroforming, and blank forming with punch are simulated by finite element method and different damage criteria, and damage initiation in them is predicted. Then, the obtained numerical results are compared with the experimental results, achieved from empirical experiments and are validated. Finally, the damage criteria are classified based on the accuracy of the predicted results and the most appropriate criteria for predicting the damage in hot forming processes is introduced. It is concluded that Brozzo and Ayada damage criteria are the most proper criteria for predicting the damage initiation in the hot forming processes.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Experimental Analysis of Heat Transfer and Friction Factor in Plate Heat Exchanger with Different Orientations Using Al2O3 Nanofluids1450145872815ENGURPREET SINGHMechanical Engineering, Chandigarh UniversityPrashant .Mechanical Engineering Department, Chandigarh UniversityJournal Article19700101Experimental investigations has been done to find out the heat transfer characteristics and friction factor of water based Al2O3 nanofluids as a coolant in brazed plate heat exchanger. Plate heat exchanger either use horizontally or vertically. The base plate of the plate heat exchanger was kept inclined at (0⁰, 30⁰ ,60⁰, 90⁰). The experimentation have been done on the two different concentration of the nanofluids (0.1 v/v% and 0.2 v/v%). It was observed that the heat trasnfer characterstics improves with increase in Reynolds number. It has been studied that nanofluids in a plate heat exchanger has maximum of 34% heat transfer rate over the base fluid. It has been observed that from horizontal to vertical heat transfer rate decreases with increase in Reynolds number. Results shows that there is (10-15) % has been found out when the base plate of plate heat exchanger made inclined from horizontal to 30⁰ of inclination. Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Comparison of Properties of Ti/TiN/TiCN/TiAlN Film Deposited by Cathodic Arc Physical Vapor and Plasma-assisted Chemical Vapor Deposition on Custom 450 Steel Substrates1459146872816ENEsmaeil PoursaeidiDepartment of Mechanical Engineering, University of Zanjan, Zanjan, IranAkbar SalarvandDepartment of Mechanical Engineering , Islamic Azad University, Doroud Branch, IranJournal Article19700101This study investigated the effects of deposition techniques on the microstructural and tribological properties of Ti/TiN/TiCN/TiAlN multilayer coatings onto a Custom 450 steel substrate. The coatings were produced using cathodic arc physical vapor deposition (CAPVD) and plasma-assisted chemical vapor deposition (PACVD). The microstructural of the coatings was evaluated using (SEM), and phase formation was analyzed by (XRD). The mechanical properties of the coatings were examined by nano-indentation testing machine. Erosion behavior was studied using an erosion tester and the electrochemical behavior of the deposited films in 3.5% (wt) NaCl solution was investigated using potentiodynamic polarization. XRD analysis indicated that TiN, TiCN, and TiAlN featured different chemical compositions in each coating. Nano-indentation showed that the hardness of the CAPVD coating was 23.35 GPa and of the PACVD coating was 12.92 GPa. The coefficient of friction was 0.22 for the CAPVD and 0.17 for the PACVD coatings. Erosion testing was conducted using two abrasive powders at impact angles of 30° and 90°. The results showed that erosion rate at an impingement angle of 90° was greater than at 30° and the CAPVD coating showed better performance. The potentiodynamic polarization curves showed that the CAPVD coating provided better corrosion resistance than the PACVD coating.Materials and Energy Research CenterInternational Journal of Engineering1025-2495291020161001Two-fluid Electrokinetic Flow in a Circular Microchannel (RESEARCH NOTE)1469147772817ENAli Jabari MoghadamMechanical Engieering, Shahrood University of Technolgy0000-0002-3838-3807Journal Article19700101The two-fluid flow is produced by the combined effects of electroosmotic force in a conducting liquid and pressure gradient force in a non-conducting liquid. The Poisson-Boltzmann and Navier-Stokes equations are solved analytically; and the effects of governing parameters are examined. Poiseuille number increases with increasing the parameters involved. In the absence of pressure gradient, the two fluids demonstrate plug-like velocity profiles. The results reveal that the two-fluid electroosmotic pumping flow rate is feasible for a relatively small interface zeta potential; or large wall zeta potential and electrokinetic radius. For particular values of the governing parameters, the flow rate approaches a specific value as the electrokinetic radius tends to infinity. A back flow (a negative value of the resultant flow rate) occurs for sufficiently small values of the wall zeta potential or sufficiently large values of the interface zeta potential (even in the case of pressure-assisted flow). Zero-value flow rates may also be attained.