Entropy Analysis for Non-Newtonian Fluid Flow in Annular Pipe: Constant Viscosity Case

Entropy

Bekir Sami Yilbas¹  Muhammet Yürüsoy¹ 

[1] ¹Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, P.O. Box 1913, Dhahran 31261, Saudi Arabia ²Technical Education Faculty, Afyon Kocatepe University, Afyon, Turkey ³Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, P.O. Box 805, Dhahran 31261, Saudi Arabia

关键词: non-Newtonian;    third grade fluid;    annular pipe;    entropy;   

DOI  :  10.3390/e6030304

来源: mdpi

【 摘 要 】

In the present study, non-Newtonian flow in annular pipe is considered. The analytical solution for velocity and temperature fields is presented while entropy generation due to fluid friction and heat transfer is formulated. The third grade fluid with constant properties is accommodated in the analysis. It is found that reducing non-Newtonian parameter increases maximum velocity magnitude and maximum temperature in the annular pipe. Total entropy generation number attains high values in the region close to the inner wall of the annular pipe, which becomes significant for low non-Newtonian parameters. Increasing Brinkman number enhances entropy generation number, particularly in the region close to the annular pipe inner wall.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.