Numerical study of Jet Impingement Subcooled Boiling on the Superheated Surfaces
Numerical study of Jet Impingement Subcooled Boiling on the Superheated Surfaces
复制标题
过热表面射流冲击过冷沸腾的数值研究
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
S. Hosseinalipour
中科院分区：
文献类型：
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作者：
Kazem Esmailpour;Arad Azizi;S. Hosseinalipour
利用相变现象即沸腾传热对过热表面进行射流冲击冷却是一种有效的方法，因为它具有很高的传热速率。此外，在特定的传热系数下，与自由壁平行流相比，冷却目的所需的流可以减少两个数量级，这对于各种行业中的能量和水可持续性问题是重要的。本文主要研究相变射流冲击核态沸腾区的流体力学和传热现象。采用基于欧拉多相模型的Rensselaer Polytechnic Institute壁面沸腾模型和RNG K-ε湍流模型.根据与真实的物理现象的接近程度，考虑并选择每个界面项。本研究中所选用的模型是通过先前所做的受限射流冲击过冷沸腾实验（介质流体-PF 5060）进行验证的。在滞止点处，最小误差为4%，最大误差为15%。作为参数研究，在Re 2500至10000范围内，研究了基于喷嘴水力直径的射流雷诺数的影响，以及在H/D为2、4和6时，射流喷嘴距靶面的喷射距离的影响。
Cooling techniques of superheated surfaces by jet impingement with taking advantage of phase change phenomena i.e. boiling heat transfer has proven to be an efficient method because of its high rates of heat transfer. Furthermore, at a specified heat transfer coefficient, flow required for cooling purposes can reduce two orders of magnitude comparing to free-wall parallel flow which is important regarding to energy and water sustainability issues in various industries. This research mainly concerns numerical simulation of hydrodynamics and heat transfer phenomena regarding phase-change jet impingement on nucleate boiling region. Rensselaer Polytechnic Institute wall boiling model based on Eulerian multiphase model and RNG K-ɛ turbulence model were employed. Each interfacial term was considered and selected based on proximity to real physical phenomena. The selected model in this research was validated by a previously done confined jet impingement subcooled boiling experiment (dielectric fluid-PF5060). Minimum error of 4% and maximum error of 15% were reached at stagnation point. As parametric study, the effect of jet Reynolds number based on nozzle hydraulic diameter at Re 2500 to 10000 and the effect of standoff distance of jet nozzle from target surface at H/D 2, 4 and 6 were investigated.