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A parametric study of heat transfer in an air-cooled heat sink enhanced by actuated plates

机译:致动板增强的风冷散热器传热的参数研究

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Heat transfer in air-cooled heat sinks must be improved to meet thermal management requirements of modern microelectronics devices. This need is addressed by putting agitator plates into channels of a heat sink so that heat transfer is enhanced by agitation. A proof-of-concept exercise was computationally conducted in a single channel consisting of uniform-temperature base and two side walls and an adiabatic fourth wall. The channel side walls are fins of the heat sink fin array. The agitator plate is within the channel. Air flows through the channel and the agitator plate generates periodic motion in a transverse direction to the air flow and to the channel surface. Turbulence is generated along the tip of the agitator plate due to its periodical motion, resulting in substantial heat transfer enhancement in the channel. Heat transfer is enhanced by 61% by agitation for a representative situation. Translational operation of the plate induces 33% more heat transfer than a corresponding flapping operation. Heat transfer on the base surface increases sharply as the tip gap size between it and the agitator plate tip is decreased, while heat transfer on the sidewalls is insensitive to the tip gap size. Heat transfer from the channel wall to the flow increases linearly with increases of amplitude or frequency of the agitator plate. The primary operational parameter to the problem is the product of amplitude and frequency, with amplitude being slightly more influential than frequency.
机译:必须改进风冷散热器中的热传递,以满足现代微电子设备的热管理要求。通过将搅拌器板放入散热器的通道中来解决此需求,以便通过搅拌来增强热传递。在一个由均温基座,两个侧壁和一个绝热第四壁组成的通道中,通过计算进行了概念验证。通道侧壁是散热器鳍片阵列的鳍片。搅拌板在通道内。空气流过通道,而搅拌板在气流和通道表面的横向产生周期性运动。由于搅拌器板的周期性运动,沿搅拌器板的尖端产生湍流,导致通道中的传热大大增强。在典型情况下,通过搅拌可使传热增加61%。平板的平移操作比相应的拍打操作引起的热传递高33%。随着底表面与搅拌板尖端之间的尖端间隙尺寸减小,底面上的热传递急剧增加,而侧壁上的热传递对尖端间隙尺寸不敏感。从通道壁到流的热传递随着搅拌板的振幅或频率的增加而线性增加。该问题的主要操作参数是幅度和频率的乘积,幅度的影响比频率稍大。

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