首页> 外文期刊>Numerical Heat Transfer, Part A. Application: An International Journal of Computation and Methodology >Heat Transfer and Flow Characteristics in Rib-/Deflector-Roughened Cooling Channels with Various Configuration Parameters
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Heat Transfer and Flow Characteristics in Rib-/Deflector-Roughened Cooling Channels with Various Configuration Parameters

机译:带有各种配置参数的肋/偏导板粗化冷却通道中的传热和流动特性

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The present paper deals with a detailed numerical investigation of the turbulent flow inside a stationary rib-/deflector-roughened cooling channel. Various downstream-shaped deflectors including sloping-board deflectors [Cases A1, A2], guide-shaped deflectors [Cases B1, B2], and drop-shaped deflectors [Cases C1, C2] and configuration parameters such as channel aspect ratio (AR=0.5, 1 and 2), and rib-pitch-to-rib-height ratio (P/e=5, 8, and 10) are investigated. The main objective is to design an appropriate deflector to improve the flow characteristics in the wake of the deflectors and guide the flow between two neighboring rib turbulators to enhance the heat transfer performance. A quasi-three-dimensional flow structure, supported by the stream tracer field in some planes, is established to improve and deepen the understanding as well as the analysis of the complex flow field in the rib-/deflector-roughened channels. In addition, the thermal performance corresponding to various rib-pitch-to-rib-height ratios and aspect ratios emphasizes the role of the configuration parameters in the heat transfer and flow resistance performance. The results demonstrate that the deflectors trip the boundary layer and blend the fluid flow, and that the sloping board deflectors contribute to enlarging the turbulence level of the whole cooling channel, more than in the wake region. It is found that Cases A1 and A2 provide the best heat transfer performance, while Case C1 presents the largest thermal enhancement factor Nu/Nu(0)/(f/f(0))(1/3) at high Reynolds number. The wide-aspect-ratio channel with deflectors and large pitch-to-height ratio ribs exhibits much better heat transfer performance.
机译:本文对固定的肋/偏转器粗糙的冷却通道内的湍流进行了详细的数值研究。各种下游形偏转器,包括斜板偏转器[情况A1,A2],导向形偏转器[情况B1,B2]和水滴形偏转器[情况C1,C2]以及配置参数,例如通道纵横比(AR =分别为0.5、1和2),以及肋距与肋高的比率(P / e = 5、8和10)。主要目的是设计一种合适的导流板,以改善导流板尾部的流动特性,并引导两个相邻的肋状湍流器之间的流动,从而提高传热性能。建立了在某些平面上由流示踪剂场支撑的准三维流结构,以改善和加深对肋/偏转器粗糙通道中复杂流场的理解和分析。另外,对应于各种肋距与肋高比和纵横比的热性能强调了配置参数在热传递和流阻性能中的作用。结果表明,导流板使边界层脱离并混合了流体流,斜板导流板比尾流区域更有助于增大整个冷却通道的湍流度。发现案例A1和案例A2提供了最佳的热传递性能,而案例C1在高雷诺数下表现出最大的热增强因子Nu / Nu(0)/(f / f(0))(1/3)。具有偏转器和大的螺距/高比肋的宽宽比通道表现出更好的传热性能。

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