Mesh Independent Analysis of Heat Transfer of a Pipe Flow under Supercritical Conditions
Because of large variations of thermal properties of supercritical water, heat transfer characteristicsare very different from that in sub critical conditions, which also brings about some difficulty ininvestigating its mechanism with CFD tools. This essay took Sarahs experiments as a reference;compared the differences of four meshes and analyzed the impact of the first grid size on the walltemperature profile. The tests suggest that wall temperature is very sensitive to the mesh parametersnear the wall while bulk fluid temperature is not. The first grid size should be small enough to makey+<1 to resolve the viscous boundary layer, or big enough to let the wall adjacent cell locate in theturbulence log law zone. The medial size which makes the first cell in the transition region willbring about numerical instability. Moreover, the wall law with Van Direst transformation is used toillustrate the near wall velocity distributions. Although the meshes have big differences among eachother, they obey the same wall law as long as their results are very similar.
Jinguang Zang Xiao Yan Shangfang Huang Juncong Yu
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Chengdu,China Tsinghua Universi CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Chengdu,China Tsinghua University,Beijing,China
国际会议
3rd China-Canada Joint Workshop on Supercritical Water-Cooled Reactors(第三届中国-加拿大超临界水堆研讨会 (CCSC-2012)
西安
英文
1-12
2012-04-18（万方平台首次上网日期，不代表论文的发表时间）