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Accuracy analysis of predicted velocity profiles of laminar duct flow with entropy generation method

Applied Mathematics and Mechanics(English Edition) 2013年第8期34卷 971-984页

作者： J.A.ESFAHANI M.MODIRKHAZENI S.MOHAMMADI Center of Excellence on Modeling and Control Systems (CEMCS) & Department of Mechanical Engineering Faculty of Engineering Ferdowsi University of Mashhad

The objective of this work is to estimate the accuracy of a predicted velocity profile which can be gained from experimental results, in comparison with the exact ones by the methodology of entropy generation. The analysis is concerned with the entropy generation rate in hydrodynamic, steady, laminar, and incompressible flow for Newtonian fluids in the insulated channels of arbitrary cross section. The entropy generation can be calculated from two local and overall techniques. Adaptation of the results of these techniques depends on the used velocity profile. Results express that in experimental works, whatever the values of local and overall entropy generation rates are close to each other, the results are more accuracy. In order to extent the subject, different geometries have been investigated. Also, the influence studied, and the distribution of volumetric geometries is drawn. of geometry on the entropy generation rate is local entropy generation rate for the selected geometries is drawn.

关键词： entropy generation velocity profile duct arbitrary cross section laminarinternal flow

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Accuracy analysis of predicted velocity profiles of laminar duct flow with entropy generation method

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应用数学和力学 2013年第8期 971-984页

作者： J. A. ESFAHANI M. MODIRKHAZENI S. MOHAMMADI Center of Excellence on Modeling and Control Systems CEMCS& Department of Mechanical Engineering Faculty of Engineering Ferdowsi University of Mashhad Mashhad 91775-1111 Iran

The objective of this work is to estimate the accuracy of a predicted velocity profile which can be gained from experimental results, in comparison with the exact ones by the methodology of entropy generation. The analysis is concerned with the entropy generation rate in hydrodynamic, steady, laminar, and incompressible flow for Newtonian fluids in the insulated channels of arbitrary cross section. The entropy generation can be calculated from two local and overall techniques. Adaptation of the results of these techniques depends on the used velocity profile. Results express that in experimental works, whatever the values of local and overall entropy generation rates are close to each other, the results are more accuracy. In order to extent the subject, different geometries have been investigated. Also, the influence of geometry on the entropy generation rate is studied, and the distribution of volumetric local entropy generation rate for the selected geometries is drawn.

关键词： entropy generation velocity profile duct arbitrary cross section laminar internal flow

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The Normalized Analysis of a Surface Heterogeneous Reaction of a Propane/Air Mixture into a Micro-Channel

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Chinese Physics Letters 2012年第12期29卷 132-136页

作者： A.Fanaee J.A.Esfahani Center of Excellence on Modelling and Control Systems(CEMCS)&Mechanical Engineering Department Ferdowsi University of MashhadMashhad 91775-1111Iran

The effect of catalytic surface reaction on non-reactive flow in micro-channels is *** hydraulic diameter of the channel is considered within the range of 0.2-1.2 mm,and the channel length is considered to be 5 *** whole length of the channel wall is coated with a *** sensitivity analysis shows that the effect of normalized hydraulic diameter is more than the normalized longitude coordinates in accordance with the existence of the large ratio of surface area to volume in the *** validation of this model,the variation of fuel conversion is compared with the published experimental data and shows an acceptable agreement.

关键词： catalyst. normalized coordinates

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Laminar film condensation on a nanosphere

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Journal of Nanotechnology in engineering and Medicine 2012年第1期3卷 1-7页

作者： Esfahani, J.A. Koohi-Fayegh, S. Center of Excellence on Modelling and Control Systems (CEMCS) Mechanical Engineering Department Ferdowsi University of Mashhad Mashhad P.O. Box 91775-1111 Iran

The present work investigates an analytical study on the problem of laminar film condensation on a nanosphere. Due to the microscale interaction, the problem is analyzed by taking into account the effects of slip in velocity and jump in temperature. A relation is derived for the liquid film thickness in the form of a nonlinear differential equation which is solved numerically using the fourth order Runge-Kutta method. Finally, the effect of velocity slip and temperature jump on different condensation parameters including the liquid film thickness, velocity and temperature profiles, Nusselt number, and liquid mass flow rate is discussed. It is found that the increase in the velocity slip and temperature jump results in a thinner liquid film and therefore increases the heat transfer coefficient. © 2012 by ASME.

关键词： Film condensation Nanosphere Nusselt number Temperature jump Velocity slip

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Detailed investigation of hydrodynamics and thermal behavior of nano/micro shear driven flow using DSMC

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Scientia Iranica 2014年第4期20卷 1228-1240页

作者： Ejtehadi, O. Roohi, E. Esfahani, J. Abolfazli Department of Mechanical Engineering Faculty of Engineering Ferdowsi University of Mashhad P. O. Box: 91775-1111 Mashhad Iran Center of Excellence on Modeling and Control Systems Ferdowsi University of Mashhad P.O. Box: 91775-111 Mashhad Iran

In the present work, we simulate rarefied gas flow between two moving nano/micro parallel plates maintained at the same uniform temperature using the direct simulation Monte Carlo (DSMC) method. We perform simulations for monatomic argon and diatomic nitrogen gas and compare mon/diatomic gas behavior. For both gases, we study heat transfer and shear stress and investigate the effects of compressibility and rarefaction in the entire Knudsen regime and for a wide range of wall Mach numbers. Slip velocity, temperature jump, wall heat flux and wall shear stress are directly sampled from the particles striking the surfaces and reported for monatomic and diatomic cases for different rarefaction regimes. We also study deviation from the equilibrium using the probability density function for argon and nitrogen gas molecules. © 2013 Sharif University of Technology. All rights reserved.

关键词： Argon

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Erratum to: Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

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Meccanica 2015年第12期50卷 3133-3133页

作者： Fanaee, S. A. Esfahani, J. A. Mechanical Engineering Department University of Birjand Birjand Iran Mechanical Engineering Department Center of Excellence on Modelling and Control Systems (CEMCS) Ferdowsi University of Mashhad Mashhad Iran

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