紊流狹長噴流衝擊冷卻半圓凹面之數值研究

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紊流狹長噴流衝擊冷卻半圓凹面之數值研究

Numerical Study of Turbulent Slot Jet Impingement Cooling on a Semi-Circular Concave Surface

魏子傑 , Masters　　Advisor：楊玉姿　　

繁體中文

數值模擬；凹面；狹長噴流；衝擊冷卻；紊流熱傳； Impingement cooling ； Turbulent heat transfer ； Slot jet ； Concave surface ； Numerical simulation

Abstract │ Reference (26) │ Altmetrics

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The 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 power-law scheme and the well-know k-epson turbulence model and its associate wall function to describe the turbulent structure. In addition, 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, dimensionless jet-to-surface distance H/B, dimensionless jet width B/D and the heat flux. The theoretical model developed is validated by comparing the numerical predictions with available experimental data in the literature. In these studied ranges, the variations of local Nusselt numbers along the semi-circular concave surface decrease monotonically from its maximum value at the stagnation point except that at low H/B=0.5, the maximum Nu shift to S/B=1.5. 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 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.

Reference ( 26 ) 〈TOP〉

Agarwal, P.K., Bower, W.W., 1982. Navier-Stokes Computations of Turbulent Compressible Two-Dimensional Impinging Jet Flowfields. AIAA Journal 20, 577-584.
連結：
Antonio, J., Muhammad M.R., John, E.L., 2000. Numerical Modeling of Conjugate Heat Transfer during Impingement of Free Liquid Jet Issuing from a Slot Nozzle. Numerical Heat Transfer 38, 45-66.
連結：
Albert, Y.T., 2003. A numerical Study on the Hydrodynamics and Heat Transfer of a Circular Liquid Jet Impinging onto a Substrate. Taylor & Francis, Numerical Heat Transfer 44, 1-19.
連結：
Cornaro, C., Fleischer, A.S., Goldstein, R.J., 1999. Flow visualization of a round jet impinging on cylindrical surfaces. Experimental Thermal and Fluid Science 20, 66-78.
連結：
Choi, M., Yoo, H.S., Yang, G., Lee, J.S., Sohn D.K., 2000. Measurements of Impinging Jet Flow and Heat Transfer on a Semi-Circular Concave Surface. International Journal of Heat and Mass Transfer 43, 1811-1822.
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