The application of exergy destruction minimization in convective heat transfer optimization
The application of exergy destruction minimization in convective heat transfer optimization
复制标题
火用破坏最小化在对流传热优化中的应用
DOI：
10.1016/j.applthermaleng.2014.09.076
复制
发表时间：
2015-09
影响因子：
6.4
通讯作者：
Liu, Zhichun
中科院分区：
文献类型：
--
作者：
Wang, Junbo;Liu, Wei;Liu, Zhichun
从理论上讨论了一种通过降低过程不可逆性来强化换热的方法。用(火用)分析了传热过程的不可逆性。换热过程的不可逆性可以用(火用)破坏来表示。在此基础上，提出了一种新的优化传热过程的方法，即火用破坏最小化方法。以(火用)损失率为优化目标，以流体功率消耗为约束条件，通过泛函变分建立附加体积力的动量方程，与能量方程耦合进行对流换热的数值模拟。将(火用)破坏最小化方法应用于对流换热优化，并在圆管中进行了数值计算，验证了方法的有效性。通过对优化方程的数值计算，找到了数值增加380%、流阻增加5%的最佳速度场。结果表明，流场中出现了多涡纵向旋流，强化了换热。涡旋越多，可以得到的数值越高。研究发现，多涡纵向旋流是圆管内具有良好换热性能的流型。数值计算结果可用于指导管内嵌件的设计。
An approach of heat transfer enhancement by reducing the irreversibility of process is discussed theoretically. The irreversibility of heat transfer process has been analysed with exergy. The irreversibility of heat transfer process can be expressed with exergy destruction. Other than entropy generation minimization and entransy dissipation minimization, a new approach called exergy destruction minimization is proposed to optimize heat transfer process based on the analysis. By setting exergy destruction rate as an optimization objective and fluid power consumption as a constraint condition, a momentum equation with an additional volume force is constructed through functional variation to numerically simulate convective heat transfer in coupling with energy equation. The approach of exergy destruction minimization is applied in the optimization of convective heat transfer and numerical calculation is carried out to validate this approach in circular tubes. The optimum velocity field with 380% increase inNunumber and 5% increase in flow resistancefis found by the numerical calculation on optimization equations. The results disclose that longitudinal swirl flow with multi-vortexes appears in the flow field, which leads to heat transfer enhancement. The more the vortexes are, the higherNunumber can be gotten. It is found that longitudinal swirl flow with multi-vortexes is a flow pattern with good heat transfer performance in circular tubes. The results of numerical calculation can be used to guide the design for tube inserts.
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