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变物性磁蠕动中的最小熵产生(EGM)。

Entropy generation minimization (EGM) in magneto peristalsis with variable properties.

机构信息

Deparment of Mathematics and Statistics, PMAS Arid Agriculture University Shamsabad, 46300 Rawalpindi, Pakistan.

Department of Mathematics, Quaid-I-Azam University 45320, Islamabad 44000, Pakistan; Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudia Arabia.

出版信息

Comput Methods Programs Biomed. 2020 Apr;186:105045. doi: 10.1016/j.cmpb.2019.105045. Epub 2019 Oct 11.

DOI:10.1016/j.cmpb.2019.105045
PMID:31734470
Abstract

OBJECTIVE AND BACKGROUND

This article featuring the peristaltic transport of viscous material with variable properties (i.e. temperature dependent viscosity and thermal conductivity) through curved configuration. Fluid saturating through porous channel walls of uniform space. Entropy generation consideration here is to analyze irreversibility aspects. Channel boundaries retain the velocity and thermal slip conditions.

METHOD

Wave frame of reference is attained with the utilization of long wavelength and small Reynolds number approach. Solution of the simplified coupled system of dimensionless constraints is obtained numerically. Detailed analysis of important quantities of interest has been presented in discussion portion.

RESULTS

Entropy generation variation near center is very small whereas in the vicinity of the channel wall is larger. Bejan number has reverse variation as observed for entropy generation.

CONCLUSION

Variable characteristics of viscosity has opposite impact on velocity and temperature is observed. It is also noticed small irreversibility effects are obtained for higher varying viscosity and thermal conductivity near the vicinity of the channel walls.

摘要

目的和背景

本文研究了通过弯曲结构输送具有可变特性(即温度依赖粘度和热导率)的粘性物质的蠕动输送。流体通过均匀空间的多孔通道壁饱和。此处的熵产生考虑是为了分析不可逆性方面。通道边界保留速度和热滑移条件。

方法

利用长波长和小雷诺数方法获得波参考系。通过数值方法获得简化的无量纲约束耦合系统的解。在讨论部分给出了感兴趣的重要数量的详细分析。

结果

中心附近的熵产生变化很小,而在通道壁附近则较大。正如观察到的熵产生一样,贝淡数具有相反的变化。

结论

发现粘度的变化特性对速度和温度有相反的影响。还注意到,在通道壁附近,较高的粘度和热导率的变化会导致较小的不可逆性效应。

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