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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical study of turbulent slot jet impingement cooling on a semi-circular concave surface
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Numerical study of turbulent slot jet impingement cooling on a semi-circular concave surface

机译：半圆形凹面湍流射流冲击冷却的数值研究

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摘要

An investigation of the flow field and heat transfer characteristics of a slot turbulent jet impinging on a semi-circular concave surface with uniform heat flux has been carried out numerically in this study. The turbulent governing equations are solved by a control-volume-based finite-difference method with a power-law scheme and the well-known k-ε turbulence model and its associate wall function to describe the turbulent structure. In addition, a body-fitted curvilinear coordinate system is employed to transform the physical domain into a computational domain. Numerical computations have been conducted with variations of jet exit Reynolds number Re_(28) (5920 ≤ Re_(28) ≤ 23,700), dimensionless jet-to-surface distance H/B (0.5 ≤ H/B ≤ 12), dimensionless jet width BID (0.033 ≤ B/D ≤ 0.05) and the heat flux q" (1663 W/m~2 < q" < 5663 W/m~2). The theoretical model developed is validated by comparing the numerical predictions with available experimental data in the literature. The variations of local Nusselt numbers along the semi-circular concave surface decrease monotonically from its maximum value at the stagnation point. The numerical results show that the local Nusselt numbers are reasonably predicted with a maximum discrepancy within 15%. As the Reynolds number fixes, the effect of the impingement distance (H/B) on the average Nusselt (Nu_(avg)) is not significant except at low H/B = 0.5. This study provides fundamental insight into turbulent slot jet impingement cooling on the semi-circular concave surface.
机译：数值研究了缝隙湍流射流撞击在均匀热通量的半圆形凹面上的流场和传热特性。湍流控制方程通过具有幂律方案的基于控制量的有限差分法和著名的k-ε湍流模型及其相关的壁函数来描述湍流结构。另外，采用人体曲线坐标系将物理域转换为计算域。对射流出口雷诺数Re_（28）（5920≤Re_（28）≤23,700），无因次射流与表面的距离H / B（0.5≤H / B≤12），无因次射流宽度的变化进行了数值计算BID（0.033≤B / D≤0.05）和热通量q“（1663 W / m〜2

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