Entropy generation and pumping power in a turbulent fluid flow through a smooth pipe subjected to constant heat flux

Ahmet Z. Sahin
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引用次数: 63

Abstract

In a heat exchange process, heat transfer and pumping power requirements are the two main considerations. Efforts made to increase heat transfer in a fluid flow usually cause increase in the pumping power requirement. In an effort to avoid inefficient utilization of energy through excessive entropy generation, a thermodynamic analysis of turbulent fluid flow through a smooth duct subjected to constant heat flux has been made in this study. The temperature dependence of the viscosity was taken into consideration in determining the heat transfer coefficient and friction factor. It was shown that the viscosity variation has a considerable effect on both the entropy generation and the pumping power. Pumping power to heat transfer ratio and the entropy generation per unit heat transfer can become very large especially for low heat flux conditions.

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在恒定热通量下,紊流流经光滑管道时的熵的产生和泵送功率
在热交换过程中,传热和泵送功率要求是两个主要考虑因素。在流体流动中增加热传递的努力通常会导致泵送功率需求的增加。为了避免由于产生过多的熵而导致能量的低效利用,本研究对紊流在恒定热通量下流过光滑管道进行了热力学分析。在确定换热系数和摩擦系数时,考虑了粘度对温度的依赖性。结果表明,粘度的变化对系统的熵产和泵浦功率都有较大的影响。特别是在低热流密度条件下,泵送功率与换热比和单位换热的熵产会变得非常大。
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