Heat transfer to a row of impinging circular air jets including the effect of entrainment
Heat transfer to a row of impinging circular air jets including the effect of entrainment
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DOI：
10.1016/0017-9310(91)90223-2
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发表时间：
1991-08
影响因子：
5.2
通讯作者：
R. J. Goldstein;W. Seol
中科院分区：
文献类型：
--
作者：
R. J. Goldstein;W. Seol
实验研究了由长径比为1的方形孔板形成的一排圆形浸没空气射流与平板表面的对流换热特性。确定了恢复因子、有效性和局部传热系数的分布。展向平均和表面平均传热系数由局部传热系数计算。传热系数是独立的射流和环境之间的温差，如果它被定义为（加热）壁温度和绝热壁温度之间的差异。有效性是独立的，不仅之间的温差射流和环境，但也射流雷诺数的范围内研究。展向平均和表面平均传热系数在冲击线上最大，并随着距离的增加而减小。
An experimental investigation is performed to characterize the convective heat transfer from a flat surface to a row of impinging, circular, submerged air jets formed by square-edged orifices having a length/diameter ratio of unity. Distributions of recovery factor, effectiveness, and local heat transfer coefficient are determined. Spanwise-average and surface-average heat transfer coefficients are calculated from the local heat transfer coefficients. The heat transfer coefficient is independent of the temperature difference between the jet and the ambient, if it is defined with the difference between the (heated) wall temperature and the adiabatic wall temperature. The effectiveness is independent not only of the temperature difference between the jet and the ambient but also of the jet Reynolds number in the range studied. Spanwise-average and surface-average heat transfer coefficients have the largest values on the impingement line and decrease with increasing distance away from it.