New thermodynamics of entropy generation minimization with nonlinear thermal radiation and nanomaterials

被引:145
作者
Hayat, T. [1 ,2 ]
Khan, M. Ijaz [1 ]
Qayyum, Sumaira [1 ]
Alsaedi, A. [2 ]
Khan, M. Imran [3 ]
机构
[1] Quaid I Azam Univ 45320, Dept Math, Islamabad 45320, Pakistan
[2] King Abdulaziz Univ, Fac Sci, Dept Math, Nonlinear Anal & Appl Math NAAM Res Grp, POB 80257, Jeddah 21589, Saudi Arabia
[3] Heriot Watt Univ, Edinburgh Campus, Edinburgh EH14 4AS, Midlothian, Scotland
关键词
Entropy generation; Brownian motion and thermophoresis; Stagnation point; Bejan number; Nonlinear thermal radiation; Heat absorption generation; STAGNATION POINT FLOW; HOMOGENEOUS-HETEROGENEOUS REACTIONS; WATER NANOFLUID FLOW; CHRISTOV HEAT-FLUX; VISCOUS DISSIPATION; CHEMICAL-REACTION; STRETCHING SHEET; MAGNETIC-FIELD; CASSON FLUID; MHD;
D O I
10.1016/j.physleta.2018.01.024
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
This research addressed entropy generation for MHD stagnation point flow of viscous nanofluid over a stretching surface. Characteristics of heat transport are analyzed through nonlinear radiation and heat generation/absorption. Nanoliquid features for Brownian moment and thermophoresis have been considered. Fluid in the presence of constant applied inclined magnetic field is considered. Flow problem is mathematically modeled and governing expressions are changed into nonlinear ordinary ones by utilizing appropriate transformations. The effects of pertinent variables on velocity, nanoparticle concentration and temperature are discussed graphically. Furthermore Brownian motion and thermophoresis effects on entropy generation and Bejan number have been examined. Total entropy generation is inspected through various flow variables. Consideration is mainly given to the convergence process. Velocity, temperature and mass gradients at the surface of sheet are calculated numerically. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:749 / 760
页数:12
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