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Experimental investigation of laminar mixed convection heat transfer from arrays of protruded heat sources

机译：突出热源阵列层流混合对流换热的实验研究

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摘要

Laminar mixed convection heat transfer in a top and bottom heated rectangular channel with protruded discrete heat sources has been investigated experimentally for air. The lower and upper surfaces of the channel were equipped with 8×4 protruded heat sources subjected to uniform heat flux. Side walls, the lower and upper walls were insulated and adiabatic. An experimental study was made for Height/ Width (H/W) ratios of (1/2), (1/4), (3/20) at various Reynolds (Re) and modified Grashof (Gr~*) numbers. From experimental measurements, row-average surface temperature and Nusselt (Nu) number distributions of the discrete heat sources were obtained and effects of Reynolds and modified Grashof numbers on these distributions were investigated. The results show that the buoyancy affected secondary flow is more effective at the greater values of H/W ratios.
机译：在顶部和底部加热的矩形通道中，带有突出的离散热源的层流混合对流换热已经通过实验研究了空气。通道的下表面和上表面装有经受均匀热通量的8×4突出热源。侧壁，下壁和上壁是绝热的和绝热的。对各种雷诺数（Re）和改进的Grashof（Gr〜*）数下的（1/2），（1/4），（3/20）的高/宽（H / W）比进行了实验研究。通过实验测量，获得了离散热源的行平均表面温度和Nusselt（Nu）数分布，并研究了雷诺数和修改的Grashof数对这些分布的影响。结果表明，受浮力影响的二次流在较高的H / W比值下更为有效。

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