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首页> 外文期刊>International Journal of Heat and Mass Transfer >Influence of height ratio on flow and heat transfer around trapezoidal geometry (a generic sharp-edged body) covering transition to periodic flow
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Influence of height ratio on flow and heat transfer around trapezoidal geometry (a generic sharp-edged body) covering transition to periodic flow

机译：高度比对梯形几何形状（通用的尖边物体）周围的流动和传热的影响，涵盖了过渡到周期性流动的过程

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摘要

Flow around an isolated generic sharp-edged object with varying height ratio (beta= 0-1) i.e. height from the rear end of the object to the front end (beta = H-2/H-1) has been investigated in cross-flow configuration covering steady and periodic regimes at Reynolds number (Re) from 1 to 150 using air as a working fluid. Flow separation is delayed with a decrease in beta. Wake formed is the highest for beta = 1 (square object) and progressively decreases with the decrease in beta. The vortex shedding effect has been demonstrated on the heat transfer phenomena around the objects. For all the cases of height ratios, as Re increases the flow undergoes supercritical Hopf bifurcation to periodic state as steady-state condition loses its stability. Stuart-Landau theory has been used to determine the value of critical Re or the onset of vortex shedding for all the cases of height ratios. As beta increases from 0 to 0.7, the value of critical Re increases. Influence of surface vorticity and surface pressure on the overall drag coefficient (C-D) has been explored. Effect of beta on the Strouhal number (St) has been investigated and the findings are in agreement with previous results. Finally, correlations relating Lr, C-D, (Nu) over bar and St with Re and beta have been developed. (C) 2018 Elsevier Ltd. All rights reserved.
机译：已经在交叉实验中研究了具有变化的高度比（β= 0-1）（即从物体的后端到前端的高度（β= H-2 / H-1））的孤立的通用锐边物体周围的流动。流量配置涵盖了使用空气作为工作流体的雷诺数（Re）从1到150的稳定和周期性状态。 β的减少会延迟流动分离。对于β= 1（正方形物体），形成的唤醒最高，并且随着β的降低而逐渐降低。已经证明了涡旋脱落效应对物体周围的传热现象有影响。对于所有高度比的情况，随着Re的增加，由于稳态条件失去了稳定性，流经历了超临界Hopf分叉而变成了周期性状态。 Stuart-Landau理论已用于确定所有高度比情况下的临界Re值或涡旋脱落的开始。当β从0增加到0.7时，临界Re值增加。已经研究了表面涡度和表面压力对总阻力系数（C-D）的影响。已经研究了β对Strouhal数（St）的影响，研究结果与先前的结果一致。最后，已经开发出与bar和St有关的Lr，C-D，（Nu）与Re和β的相关性。 （C）2018 Elsevier Ltd.保留所有权利。

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