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MHD flow and heat transfer of a hybrid nanofluid past a permeable stretching/shrinking wedge

Applied Mathematics and Mechanics(English Edition) 2020年第3期41卷 507-520页

作者： i.waini A.iSHAK i.POP Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan Universiti Teknikal Malaysia MelakaHang Tuah JayaDurian Tunggal 76100MelakaMalaysia Department of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaUKM Bangi 43600SelangorMalaysia Department of Mathematics Babe¸s-Bolyai UniversityCluj-Napoca 400084Romania

The steady flow and heat transfer of a hybrid nanofluid past a permeable stretching/shrinking wedge with magnetic field and radiation effects are studied. The governing equations of the hybrid nanofluid are converted to the similarity equations by techniques of the similarity transformation. The bvp4c function that is available in MATLAB software is utilized for solving the similarity equations numerically. The numerical results are obtained for selected different values of parameters. The results discover that two solutions exist, up to a certain value of the stretching/shrinking and suction strengths. The critical value in which the solution is in existence decreases as nanoparticle volume fractions for copper and wedge angle parameter increase. it is also found that the hybrid nanofluid enhances the heat transfer rate compared with the regular nanofluid. The reduction of the heat transfer rate is observed with the increase in radiation parameter. The temporal stability analysis is performed to analyze the stability of the dual solutions, and it is revealed that only one of them is stable and physically reliable.

关键词： dual solution hybrid nanofluid stretching/shrinking wedge magnetic field radiation stability analysis

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Magnetohydrodynamic flow past a shrinking vertical sheet in a dusty hybrid nanofluid with thermal radiation

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Applied Mathematics and Mechanics(English Edition) 2022年第1期43卷 127-140页

作者： i.waini A.iSHAK i.POP Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan Universiti Teknikal Malaysia MelakaDurian Tunggal76100Malaysia Department of Mathematical Sciences Universiti Kebangsaan MalaysiaBangi43600Malaysia Department of Mathematics Babeş-Bolyai UniversityCluj-Napoca400084Romania

The magnetohydrodynamic(MHD)mixed convection flow past a shrinking vertical sheet with thermal radiation is ***,the effects of Cu-Al_(2)O_(3) nanoparticles and dust particles are *** similarity variables reduce the governing equations to the similarity equations,which are then solved *** outcome shows that,for the shrinking case,the solutions are not *** rate of heat transfer and the friction factor enlarge with increasing the values of the copper nanoparticle volume fraction as well as the magnetic ***,the assisting flow and the rise of the thermal radiation reduce these *** solutions are found,and the boundary layer separation is dependent on the mixed convection parameter.

关键词： dusty fluid hybrid nanofluid magnetohydrodynamic(MHD) mixed convection shrinking sheet thermal radiation dual solution

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Hybrid Nanofluid Flow with Homogeneous-Heterogeneous Reactions

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Computers, Materials & Continua 2021年第9期68卷 3255-3269页

作者： iskandar waini Anuar ishak ioan Pop Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan Universiti Teknikal Malaysia MelakaHang Tuah Jaya76100Durian TunggalMelakaMalaysia Department of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Mathematics Babe¸s-Bolyai University400084Cluj-NapocaRomania

This study examines the stagnation point flow over a stretching/shrinking sheet in a hybrid nanofluid with homogeneous-heterogeneous *** hybrid nanofluid consists of copper(Cu)and alumina(Al2O3)nanoparticles which are added into water to form Cu-Al2O3/water hybrid *** similarity equations are obtained using a similarity ***,the function bvp4c in MATLAB is utilised to obtain the numerical *** dual solutions are found for limited values of the stretching/shrinking ***,the turning point arises in the shrinking region(λides,the presence of hybrid nanoparticles enhances the heat transfer rate,skin friction coefficient,and the concentration *** addition,the concentration gradient is intensified with the heterogeneous reaction but the effect is opposite for the homogeneous ***,the velocity and the concentration increase,whereas the temperature decreases for higher compositions of hybrid ***,the concentration decreases for larger values of homogeneous and heterogeneous *** is consistent with the fact that higher reaction rate cause a reduction in the rate of ***,the velocity and the temperature are not affected by these *** these observations,it can be concluded that the effect of the homogeneous and heterogeneous reactions is dominant on the concentration *** solutions are obtained for a single value of *** temporal stability analysis shows that only one of these solutions is stable and thus physically reliable over time.

关键词： Homogeneous-heterogeneous reactions stagnation point hybrid nanofluid shrinking sheet dual solutions stability analysis

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Stability Scrutinization of Agrawal Axisymmetric Flow of Nanofluid through a Permeable Moving Disk Due to Renewable Solar Radiation with Smoluchowski Temperature and Maxwell Velocity Slip Boundary Conditions

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Computer Modeling in Engineering & Sciences 2023年第2期134卷 1371-1392页

作者： Umair Khan Aurang Zaib Anuar ishak iskandar waini El-Sayed M.Sherif Dumitru Baleanu Department of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaBangi43600Malaysia Department of Mathematics and Social Sciences Sukkur IBA UniversitySukkur65200Pakistan Department of Mathematical Sciences Federal Urdu University of ArtsScience&TechnologyKarachi75300Pakistan Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan Universiti Teknikal Malaysia MelakaMelaka76100Malaysia Mechanical Engineering Department College of EngineeringKing Saud UniversityRiyadh11423Saudi Arabia Department of Mathematics Cankaya UniversityAnkara06790Turkey institute of Space Sciences Magurele077125Romania Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung40447Taiwan

The utilization of solar energy is essential to all living things since the beginning of *** addition to being a constant source of energy,solar energy(SE)can also be used to generate heat and *** technology enables to convert the solar energy into electricity by using thermal solar *** energy is perhaps the most easily accessible and plentiful source of sustainable ***-based nanofluid has been considered as a method to improve solar collector performance by absorbing incoming solar energy *** goal of this research is to explore theoretically the Agrawal axisymmetric flow induced by Cu-water nanofluid over a moving permeable disk caused by solar ***,the impacts of Maxwell velocity and Smoluchowski temperature slip are incorporated to discuss the fine points of nanofluid flow and characteristics of heat *** primary partial differential equations are transformed to similarity equations by employing similarity variables and then utilizing bvp4c to resolve the set of equations *** current numerical approach can produce double solutions by providing suitable initial *** addition,the results revealed that the impact of solar collector efficiency enhances significantly due to nanoparticle volume *** suction parameter delays the boundary layer ***,stability analysis is performed and is found that the upper solution is stable and physically trustworthy while the lower one is unstable.

关键词： Agrawal axisymmetric flow solar energy nanofluid heat transfer slip conditions

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