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Abstract:
实验研究了液体射流垂直冲击在加热竖直小壁面上的局部换热特性,在Re_d=4.04×10~3~1.37×10~4范围内,驻点换热可以用方程 Nu_d=1.29P_r~m·Re_d~(0.5)表示,对于湍流,势流核心长度L/d与速度无关,L/d=5,建议势流核心外驻点Nu与Z/d的关系用 Nu_d/Nu_(max)=[(L/d)/(Z/d)]~(0.5)表示,势流核心区内换热系数的径向分布用以下方程表示: 驻点区:Nu_d/Nu_(max)=(r/d)~(-0.5)tanh~(0.5)(0.88r/d) 壁面射流区:Nu_d/Nu_(max)=0.348Re_(d,u_0)~(n-0.5)·(r/...
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Source :
北京工业大学学报
Year: 1989
Issue: 03
Page: 20-26
Cited Count:
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30 Days PV: 0