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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of angle of incidence on mixed convective wake dynamics and heat transfer past a square cylinder in cross flow at Re = 100
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Effect of angle of incidence on mixed convective wake dynamics and heat transfer past a square cylinder in cross flow at Re = 100

机译：入射角对Re = 100时横流中混合对流尾流动力学和传热的影响

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摘要

In this paper, a numerical investigation is performed to study the mixed convective flow and heat transfer characteristics past a square cylinder in cross flow at incidence. Utilizing air (Pr=0.71) as an operating fluid, computations are carried out at a representative Reynolds number (Re) of 100. Angles of incidences are varied as, 0° ≤ α ≤ 45°. Effect of superimposed positive and negative cross-flow buoyancy is brought about by varying the Richardson number (Ri) in the range -1.0 ≤ Ri ≤ 1.0. The detail features of flow topology and heat transport are analyzed critically for different angles of incidences. The thermo fluidic forces acting on the cylinder during mixed convection are captured in terms of the drag (C_D), lift (C_L), and moment (C_M) coefficients. The results show that the lateral width of the cylinder wake reduces with increasing a and the isotherms spread out far wide. In the range 0° ＜ α ＜ 45°, C_D reduces with increasing Ri. The functional dependence of C_M with Ri reveals a linear relationship. Thermal boundary layer thickness reduces with increasing angle of incidences. The global rate of heat transfer from the cylinder increases with increasing α.
机译：在本文中，进行了数值研究，以研究在入射时横流通过方形圆柱体的混合对流和传热特性。使用空气（Pr = 0.71）作为工作流体，以雷诺数（Re）的代表值为100进行计算。入射角的变化范围为0°≤α≤45°。通过在-1.0≤Ri≤1.0的范围内改变Richardson数（Ri），可以实现叠加的正负错流浮力的效果。严格分析了流动拓扑和传热的详细特征，以适应不同的入射角。混合对流过程中作用在气缸上的热流体力根据阻力系数（C_D），升程（C_L）和力矩（C_M）来捕获。结果表明，圆柱尾流的横向宽度随α的增加而减小，等温线分布得很宽。在0°＜α＜45°范围内，C_D随着Ri的增加而降低。 C_M与Ri的功能依赖性揭示了线性关系。热边界层的厚度随着入射角的增加而减小。汽缸的总传热率随α的增加而增加。

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