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首页> 外文期刊>International Journal of Heat and Mass Transfer >An experimental study on the effects of agitation on convective heat transfer
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An experimental study on the effects of agitation on convective heat transfer

机译：搅拌对流换热影响的实验研究

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In this study, agitation is produced inside a channel by a plate that is periodically oscillating normal to the channel side walls. The test channel simulates a deep-finned rectangular channel open on one end to a plenum and with a gap to allow flow over the tip of the agitator plate. The purpose of agitation is to strongly mix the near-wall flow, to thin the thermal boundary layer and to increase the convective heat transfer coefficient. Heat transfer and velocity measurements are made within different regions of the channel to study the effectiveness of such agitation. The entry region which is closest to the open end (plenum) is characterized by unsteadily driven periodic flow. The base region close to the channel base and agitator tip gap has high vortical activity and turbulent flow. The central region between the two has an unsteadily driven channel flow in one direction of oscillation and is rich in adverted turbulence in the other direction. A parametric study is done to identify parameters that are critical to enhancing heat transfer. The amount of agitation produced in the channel directly scales with increasing frequency. Agitation is found to scale almost entirely with agitation velocity, the product of amplitude and frequency, with amplitude being only slightly more important than frequency in a few cases. Though this study finds application in electronics cooling where agitation can be used inside finned, air-cooled heat sinks to enhance heat transfer with walls, the results could be applied to any similar situation with such enhancement of heat or mass transfer with active surfaces. Very few experimental studies can be found in the literature on flow agitation effects on wall transport.
机译：在这项研究中，搅动是通过一块板产生的，该板周期性地垂直于通道侧壁振荡。该测试通道模拟了一条深鳍矩形通道，该通道的一端通向气室，并带有一定的间隙，以允许流过搅拌板的尖端。搅拌的目的是使近壁流强烈混合，使热边界层变薄并增加对流传热系数。在通道的不同区域内进行传热和速度测量，以研究这种搅拌的有效性。最接近开口端（气室）的进入区域的特征在于不稳定的周期性驱动流动。靠近通道底部和搅拌器尖端间隙的底部区域具有高涡旋活动性和湍流。两者之间的中心区域在一个振荡方向上具有不稳定的驱动通道流动，而在另一方向上具有丰富的湍流。进行了参数研究，以确定对增强传热至关重要的参数。通道中产生的搅拌量随频率增加而直接成比例。发现搅拌几乎完全随搅拌速度而定，搅拌速度是振幅和频率的乘积，在某些情况下振幅仅比频率重要。尽管这项研究发现了在电子冷却中的应用，其中可以在翅片式风冷散热器中使用搅拌来增强与壁的传热，但该结果也可以应用于任何类似的情况，例如通过活动表面增强传热或传质。关于流动搅拌对壁运输的影响的文献中很少有实验研究。

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