The European Physical Journal E ( IF 1.8 ) Pub Date : 2021-03-15 , DOI: 10.1140/epje/s10189-021-00024-x H Thameem Basha 1 , R Sivaraj 1
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Abstract
Evaluating the entropy generation is essential in thermal systems to avoid the unnecessarily wasted thermal energy during the thermal processes. Nowadays, researchers are greatly fascinated to scrutinize the entropy generation in a human system because it is utilized as a thermodynamic approach to understand the heat transfer characteristics of cancer systems or wounded tissue and their accessibility status. Further, numerous nanoparticles have been employed as an agent to control the heat transfer of blood and wounded tissue. As a result, the present model manifests the entropy generation, flow characteristics and heat transport of Ag/Fe\(_3\)O\(_4\)-blood flow of a nanofluid in a permeable circular tube with the influence of variable electrical conductivity and linear radiation. Nonlinear transport equations are converted into ordinary differential equations by suitable similarity variables which are solved with weighted residual method. Significant parameters like Reynolds number, dimensionless permeability parameter, extending/contracting parameter, Eckert number and Hartmann number on the radial pressure, axial velocity, radial velocity and temperature are explored through graphs. The obtained results show that temperature distribution of Fe\(_3\)O\(_4\) nanoparticles is higher than Ag nanoparticle, in case of suction. The dimensionless permeability parameter has an opposite nature on the radial pressure for the suction and injection cases. Growing values of Hartmann number enhance the total entropy generation for the cases of suction and injection.
Graphic Abstract
中文翻译：
探索Ag/Fe $$_3$$ 3 O $$_4$$ 4 -血液纳米流体在多孔管中的传热和熵产生：搭配解决方案
抽象的
评估热系统中的熵产生至关重要，以避免热过程中不必要的热能浪费。如今，研究人员非常着迷于仔细研究人体系统中的熵产生，因为它被用作热力学方法来了解癌症系统或受伤组织的传热特性及其可及性状态。此外，许多纳米颗粒已被用作控制血液和受伤组织的热传递的试剂。因此，本模型体现了可变电导率影响下可渗透圆管中纳米流体的Ag/Fe \(_3\) O \(_4\) -血流的熵产生、流动特性和热传递和线性辐射。通过合适的相似变量将非线性输运方程转化为常微分方程，并用加权残差法求解。通过图表探讨了雷诺数、无量纲渗透率参数、伸缩参数、埃克特数和哈特曼数等对径向压力、轴向速度、径向速度和温度的重要参数。结果表明，在吸力情况下，Fe \(_3\) O \(_4\)纳米颗粒的温度分布高于 Ag 纳米颗粒。无量纲渗透率参数对于抽吸和注入情况下的径向压力具有相反的性质。哈特曼数的增大值增强了抽吸和注射情况下的总熵产生。
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