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首页> 外文期刊>Heat Transfer Research >NUMERICAL STUDY OF THERMAL ENHANCEMENT IN MODIFIED RACCOON MICROCHANNELS
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NUMERICAL STUDY OF THERMAL ENHANCEMENT IN MODIFIED RACCOON MICROCHANNELS

机译：改性浣熊微通道热增强的数值研究

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摘要

An improved design of raccoon microchannel heat sink with a combined change in wave amplitude and wavelength along the channel length is proposed in this work. A three-dimensional conjugate heat transfer model studies the characteristics of fluid flow and heat transfer numerically. The total channel length is divided into three zones of equal length where the channel expansion factor (alpha) and waviness (gamma) are varied in each zone to create six sets of modified raccoon microchannels (MRMC). The results indicate that changing the waviness (gamma) along an equally divided length of the channel in MRMC contributed to disturbance of the core fluid region and intensified the mixing of laminar boundary layer that enhances the thermal performance of the microchannel. The assessment of MRMC is based on the thermal performance factor (eta), and the results indicate that there exists an optimal combination of wave amplitude and wavelength arrangement along the channel length, which has an additive effect on the thermal performance. The Nusselt number and friction factor of the new heat-sink design is well demonstrated by comparison with the simple raccoon microchannel (SRMC). In addition, a wide range of parametric variations is also considered to indicate the axial wall conduction effect in raccoon microchannels.
机译：在这项工作中提出了一种改进的浣熊微通道散热器的浣熊微通道散热器，以及沿沟道长度的波长变化的变化。三维共轭传热模型研究了数控流体流动和热传递的特性。总通道长度被分成三个相等长度的区域，其中通道膨胀因子（α）和波纹（伽马）在每个区域中变化，以创建六组改进的浣熊微通道（MRMC）。结果表明，沿MRMC中的通道的相同划分的长度改变波状（γ）导致核心流体区域的干扰，并强化了层边界层的混合，该混合层增强了微通道的热性能。 MRMC的评估基于热性能因子（ETA），并且结果表明沿沟道长度存在波幅和波长布置的最佳组合，这对热性能具有添加效果。通过与简单的浣熊微通道（SRMC）进行比较，阐明了新的散热器设计的营养数和摩擦系数。另外，还考虑了广泛的参数变型来指示浣熊微通道中的轴向壁传导效应。

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