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Entropy Generation in Water- Based Natural Circulation Loop

机译：水基自然循环回路中的熵产生

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摘要

Natural circulation loop (NCL) based secondary fluid systems are simple, reliable, and inexpensive due to the absence of any moving components such as pumps. Water-based NCLs are widely used in applications such as solar collectors and nuclear reactors. Also, most of the studies on NCLs do not consider the three-dimensional (3D) variation of the field variables. In the subject work, 3D steady flow simulation of water based, single-phase rectangular NCL with isothermal source and sink has been carried out to study the effects of different design and operating parameters such as loop height, temperature lift, in plane and out of plane tilt angles on the rate of heat transfer, and the rate of entropy generation due to both fluid flow and heat transfer. The rate of entropy generation due to both heat transfer and fluid flow for turbulent flow regimes in a NCL is calculated for a wide range of design and operating parameters. In turbulent flow regimes, the rate of entropy generation due to fluid flow is significant although the rate of entropy generation due to heat transfer is dominant. All the above-mentioned design and operating parameters have significant effect on the rate of entropy generation and the rate of heat transfer as well. With increases in loop height and temperature lift, the rate of entropy generation increases. As the tilt angle increases in the XY plane, the rate of the entropy generation initially increases but after certain tilt angle it starts decreasing.
机译：由于没有任何活动部件（例如泵），基于自然循环回路（NCL）的二次流体系统简单，可靠且便宜。水性NCL广泛用于太阳能收集器和核反应堆等应用中。而且，大多数关于NCL的研究都没有考虑场变量的三维（3D）变化。在主题工作中，已经进行了带有恒温源和汇的水基单相矩形NCL的3D稳态流仿真，以研究不同设计和操作参数（例如回路高度，温度提升，平面内和外）的影响平面倾角取决于传热速率，以及由于流体流动和传热引起的熵产生速率。对于广泛的设计和操作参数，可以计算出NCL中湍流状态下由于传热和流体流动而产生的熵产生率。在湍流状态下，尽管由于传热引起的熵产生速率占主导地位，但由于流体流动产生的熵产生速率却很高。所有上述设计和操作参数都对熵的产生速率和热传递速率具有显着影响。随着回路高度和温度提升的增加，熵的产生速率增加。随着在XY平面中倾斜角的增加，熵的生成速率最初会增加，但是在某些倾斜角之后，熵的生成率会开始减小。

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