동심 환형관 내 난류 열전달의 직접 수치 모사DNS of turbulent heat transfer in a concentric annulus

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A direct numerical simulation is performed for turbulent heat transfer in a concentric annulus at $Re_{Dh}=8900\;and\;Pr=0.71$ for two radius ratios ($R_{1}/R_{2}=0.1\;and\;0.5$) and $q^{\ast}=1.0$. Main emphasis is placed on the transverse curvature effect on near-wall turbulent thermal structures. Near-wall turbulent structures close to the inner and outer walls are scrutinized by computing the lower-order statistics. The fluctuating temperature variance and turbulent heat flux budgets are illustrated to confirm the results of the lower-order statistics. The present numerical results show that the turbulent structures near the outer wall are more activated than those near the inner wall, which may be attributed to the different vortex regeneration processes between the inner and outer walls.
Issue Date
2002-01-01
Language
KOR
Citation

2nd National Congress on Fluids Engineering, pp.827 - 830

URI
http://hdl.handle.net/10203/137351
Appears in Collection
ME-Conference Papers(학술회의논문)
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