Exergy destruction minimization: A principle to convective heat transfer enhancement
Exergy destruction minimization: A principle to convective heat transfer enhancement
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火用破坏最小化：对流传热强化的原理
DOI：
10.1016/j.ijheatmasstransfer.2018.01.048
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发表时间：
2018-07
影响因子：
5.2
通讯作者：
Z. C. Liu
中科院分区：
文献类型：
--
作者：
Wei Liu;Peng Liu;Junbo Wang;Nianben Zheng;Z. C. Liu
摘要通过加强流体扰动来增强对流换热是提高能源系统利用效率的有效途径。本研究为了引入对流强化传热的原理，定义了有效势能这个物理量，并推导了有效势能方程，得到了传热和流体流动引起的局部火能破坏的表达式。然后，采用适当的目标函数和约束条件，以火能破坏最小化为原则，建立了对流换热优化数学模型，通过求解优化控制方程得到了多涡纵向旋转流场的最优流场。最后，通过数值模拟和PIV实验，研究了由中心连接的锥形片组成的换热单元在管内实现多涡纵向旋转流动，结果表明换热强化效果良好。
Abstract Enhancing convective heat transfer, by strengthening fluid disturbance, is an effective way of raising the utilization efficiency of an energy system. In this study, in order to introduce a principle for convective heat transfer enhancement, a physical quantity called available potential was defined, and an equation of available potential was derived to obtain an expression of local exergy destruction caused by heat transfer and fluid flow. Then, a mathematical model of convective heat transfer optimization was established by adopting adequate objective function and constraint condition based on exergy destruction minimization, and an optimal flow field of longitudinal whirling flow with multi-vortexes was obtained by solving the optimization controlling equations. Finally, through numerical simulation and a PIV experiment, a heat transfer unit consisting of center-connected awl-shaped slices was studied to realize longitudinal whirling flow with multi-vortexes in a tube, which indicated an excellent effect of heat transfer enhancement.
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