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首页> 外文会议>American Society of Mechanical Engineers(ASME) Heat Transfer/Fluids Engineering Summer Conference 2004(HT/FED 2004) vol.3; 20040711-15; Charlotte,NC(US) >Heat transfer in a narrow channel roughened by 45° ribs with twin-blow entrances
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Heat transfer in a narrow channel roughened by 45° ribs with twin-blow entrances

机译：在狭窄的通道中进行传热，该通道被带有双吹气入口的45°肋粗糙化

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摘要

This experimental study investigates the heat transfer in a narrow, rib-roughened, rectangular channel with the width-to-height ratio of 10 for its cross-sectional shape. Two flow entrances with equal areas are respectively opened at the upper and side ends of this channel that allows for increasing the coolant-flow fed into the enhanced channel without increasing the height of cooling device. At a fixed total coolant mass flow rate, three test scenarios, namely the single-blow from the side or upper entrance and the twin-blow with the coolant mass flow ratio of 2:1 between the side and upper blows are performed. A selection of detailed heat transfer measurements, evaluated from infrared thermal images over the rib-roughened surface, illustrates the manner by which the flow entry direction and the twin-blow condition affect the local and spatially averaged heat transfers. Relative to the heat transfer results acquired from the single-blow tests, the present twin-blow entry condition could augment the spatially averaged heat transfers to the levels of 150-180% of the single-blow reference levels. A regression-type analysis is subsequently performed to develop the correlation of spatially-averaged Nusselt numbers over rib-roughened surface, which permits the effect of Reynolds number, evaluated from the total amount of coolant consumption, on heat transfer to be determined for three test scenarios.
机译：这项实验研究调查了在一个狭窄的，肋状的，矩形的通道中的传热，该通道的横截面形状的宽高比为10。在该通道的上端和侧端分别开有两个面积相等的流入口，这允许在不增加冷却装置高度的情况下增加流入增强通道的冷却剂流量。在固定的总冷却剂质量流量下，执行三种测试方案，即从侧面或上部入口的单吹和在侧面吹气与上部吹气之间的冷却剂质量流量比为2：1的双吹。根据肋肋粗糙表面上的红外热图像评估的一系列详细的传热测量结果，说明了进风方向和双吹条件影响局部和空间平均传热的方式。相对于单吹测试获得的传热结果，当前的双吹进入条件可以将空间平均传热提高到单吹参考水平的150-180％的水平。随后进行回归类型分析，以开发肋骨粗糙表面上空间平均Nusselt数的相关性，从而可以确定制冷剂消耗总量评估的雷诺数对传热的影响，这需要进行三个测试场景。

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