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A 2D numerical study on the condensation characteristics of three non-azeotropic binary hydrocarbon vapor mixtures on a vertical plate

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Chinese Journal of Chemical Engineering 2020年第11期28卷 2746-2757页

作者： Lili Zhang Guanmin Zhang Yi Zhang Maocheng Tian Jingzhi Zhang School of Energy and Power Engineering Shandong UniversityJinan 250061China

To improve the transportation efficiency and reduce the supply cost,the liquefaction becomes an important technology to store and transport the natural *** the liquefaction,the various components(***,ethane,methane etc.)undergo fractional condensation phenomenon due to their different boiling *** means that when one component condenses,others play a role of non-condensable gas(NCG).In order to reveal the influence mechanism of NCG on this condensation process,a numerical method was employed in this paper to study the condensation characteristics of three non-azeotropic binary hydrocarbon vapor mixtures,namely the propane/methane(80%–95%),ethane/methane(65%–85%)and methane/nitrogen(2%–13%)mixtures,on a vertical *** model was proposed based on the diffusion layer model,and the finite volume method was used to solve the governing equations.A user defined function was developed by cell iterative method to obtain the source terms in the condensation *** numerical results show that the gas phase boundary layer formed by the NCG becomes the main resistance to the reduction of heat transfer *** for the above three mixtures,there is a negative correlation between the NCG concentration and the heat transfer ***,the results show a good agreement with the experimental data,meaning that the proposed model is *** mixtures within same non-condensable mole fraction of 20%were also investigated,indicating that the mixtures with a higher binary hydrocarbon molecular ratio have a lower heat transfer *** a result,the presence of the lighter NCG contributes to a thicker boundary layer.

关键词： Condensation characteristics Non-azeotropic hydrocarbon mixtures Heat and mass transfer Liquid film distribution vertical plate

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Effects of magnetohydrodynamic flow past a vertical plate with variable surface temperature

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Applied Mathematics and Mechanics(English Edition) 2010年第3期31卷 329-338页

作者： Ibrahim A.ABBAS G.PALANI Department of Mathematics Faculty of Sciences and ArtsNajran University Department of Mathematics Faculty of ScienceSohag University Department of Mathematics S.S.Govt.Arts College

An analysis is performed to study the magnetohydrodynamic flow of an electrically conducting, viscous incompressible fluid past a semi-infinite vertical plate with variable surface temperature under the action of transversely applied magnetic field. The heat due to viscous dissipation and the induced magnetic field are assumed to be negligible. The dimensionless governing equations are unsteady, two-dimensional, coupled and non-linear governing equations. It is found that the magnetic field parameter has a retarding effect on the velocities of air and water.

关键词： finite element vertical plate skin friction velocity Nusselt number

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MHD flow of Boungiorno model nanofluid over a vertical plate with internal heat generation/absorption

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Propulsion and Power Research 2016年第3期5卷 211-222页

作者： B.Ganga S.Mohamed Yusuff Ansari N.Vishnu Ganesh A.K.Abdul Hakeem Department of Mathematics Providence College for WomenCoonoor 643104India Department of Mathematics Jamal Mohamed CollegeTrichy 620020India Department of Mathematics Sri Ramakrishna Mission Vidyalaya College of Arts&ScienceCoimbatore 641020India

A mathematical analysis has been carried out to investigate the effect of internal heat generation/absorption on steady two-dimensional radiative magnetohydrodynamics(MHD)boundary-layer flow of a viscous,incompressible nanofluid over a vertical plate.A system of governing nonlinear PDEs is converted into a set of nonlinear ODEs by suitable similarity transformations and then solved analytically using HAM and numerically by the fourth order Runge–Kutta integration scheme with shooting *** effects of different controlling parameters on the dimensionless velocity,temperature and nanoparticle volume fraction profiles are discussed *** reduced Nusslet number and the local Sherwood number are *** is found that the nanosolid volume fraction profile decreases in the presence of heat generation and increases in the case of heat absorption and a reverse trend is observed in velocity *** excellent agreement is observed between present analytical and numerical ***,comparisons have been made with bench mark solutions for a special case and obtained a very good agreement.

关键词： Heat generation/absorption Homotopy analysis method Magnetohydrodynamics(MHD) Nanofluid vertical plate

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A Study of Two Dimensional Unsteady MHD Free Convection Flow over a vertical plate in the Presence of Radiation

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Open Journal of Fluid Dynamics 2021年第1期11卷 20-33页

作者： Mohammad Sharif Ullah Absana Tarammim Mohammed Jahir Uddin Department of Mathematics Feni University Feni Bangladesh Department of Mathematics Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh Department of Mathematics Chittagong University of Engineering and Technology (CUET) Chittagong Bangladesh Department of Mathematics Feni Government College Feni Bangladesh

This paper compacts with an exact analysis of radiative effects on the magnetohydrodynamic (MHD) free convection flow of an electrically conducting incompressible viscous fluid over a vertical plate. The non-dimensional continuity, momentum, and energy equations are solved using appropriate transformation. The dimensionless momentum and energy equations are solved numerically through an explicit finite difference method. The stability and convergence analysis also discussed. Finally, outcomes of the parameters on velocity and temperature profiles are displayed graphically and qualitatively.

关键词： Heat Transfer Mass Transfer MHD vertical plate Convection Flow

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Soret and Dufour effects on unsteady MHD flow past an infinite vertical porous plate with thermal radiation

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Applied Mathematics and Mechanics(English Edition) 2010年第12期31卷 1481-1496页

作者： S.R.VEMPATI A.B.LAXMI-NARAYANA-GARI Department of Mathematics University College of ScienceOsmania University

The objective of the present study is to investigate the effect of flow parameters on the free convection and mass transfer of an unsteady magnetohydrodynamic flow of an electrically conducting, viscous, and incompressible fluid past an infinite vertical porous plate under oscillatory suction velocity and thermal radiation. The Dufour （diffusion thermo） and Soret （thermal diffusion） effects are taken into account. The problem is solved numerically using the finite element method for the velocity, the temperature, and the concentration field. The expression for the skin friction, the rate of heat and mass transfer is obtained. The results are presented numerically through graphs and tables for the externally cooled plate （Gr 〉 0） and the externally heated plate （Gr 〈 0） to observe the effects of various parameters encountered in the equations.

关键词： mass transfer magnetohydrodynamic flow vertical plate suction velocity,Soret and Dufour number thermal radiation finite element method

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Fully Developed Convective Heat Transfer of Power Law Fluids in a Circular Tube

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Chinese Physics Letters 2008年第1期25卷 195-197页

作者：郑连存张欣欣马连喜 Department of Mathematics and Mechanics University of Science and Technology Beijing Beijing 100083 School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 Department of Physics Texas A & M University College Station Texas 77843-4242 USA

We present a theoretical analysis for fully developed convective beat transfer in a circular tube for power law fluids by assuming that the thermal diffusivity is a function of temperature gradient. The analytical eolution is obtained and the heat transfer behaviour is investigated under a constant heat flux boundary condition. It is shown that the Nusselt number strongly depends on the value of power law index n. The Nusselt number sharply decreases in the range of 0 〈 n 〈 0.1. However, for n 〉 0.5, the Nusselt number decreases monotonically with the increasing n, and for n 〉 20, the values of Nusselt number approach a constant.

关键词： NON-NEWTONIAN FLUIDS CONTINUOUS MOVING SURFACE BOUNDARY-VALUE PROBLEM MIXED CONVECTION PSEUDOPLASTIC FLUIDS vertical plate LAYER-FLOW MOMENTUM INJECTION WALL

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