ライブラリ登録: Guest
Begell Digital Portal Begellデジタルライブラリー 電子書籍 ジャーナル 参考文献と会報 リサーチ集
Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN 印刷: 1940-2503
ISSN オンライン: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2016018890
pages 29-47

HEAT TRANSFER AND ENTROPY GENERATION DUE TO A NANOFLUID OVER STRETCHING CYLINDER: EFFECTS OF THERMAL STRATIFICATION

Sameh Elsayed Ahmed
Department of Mathematics, Faculty of Science, Abha, King Khalid University, Saudi Arabia; Department of Mathematics, Faculty of Science, South Valley University, Qena, Egypt
Shadia S. Mohamed
Mathematics Department, Faculty of Science, South Valley University, Qena, Egypt
M. A. Mansour
Department of Mathematics, Assuit University, Faculty of Science, Assuit, Egypt
A. Mahdy
Mathematics Department, Faculty of Science, South Valley University, Qena, Egypt

要約

In this paper, the effects of thermal stratification and uniform suction/injection on the heat transfer and entropy generation by forced convective flow of nanofluids over a horizontal stretching tube are analyzed. The model used for the nanofluid contains the effects of Brownian motion and thermophoresis. Similarity transformations are used to transform the fundamental governing nonlinear boundary layer equations to a system of nonlinear ordinary differential equations for fitting boundary conditions and those are solved, numerically, using the function bvp4c from the MATLAB package. Also, the effects of the different physical parameters on the velocity, pressure distributions, temperature profiles, and nanoparticles concentration distributions are presented in graphs and used to find the stable system via entropy generation minimization. The values of the skin-friction coefficient and Nusselt number are presented in tables. The obtained results are compared with previously published works and found to be in excellent agreements. The numerical results show that the effect of the suction parameter gives the highest entropy near the surface of the cylinder, while the injection parameter minimizes the entropy generation.