Hi'/> Size dependences of hydraulic resistance and heat transfer of fluid flow in elliptical microchannel heat sinks with boundary slip
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首页> 外文期刊>International Journal of Heat and Mass Transfer >Size dependences of hydraulic resistance and heat transfer of fluid flow in elliptical microchannel heat sinks with boundary slip
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Size dependences of hydraulic resistance and heat transfer of fluid flow in elliptical microchannel heat sinks with boundary slip

机译：具有边界滑移的椭圆形微通道散热器中水力阻力和流体流动传热的尺寸依赖性

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Highlights•Size dependence of hydraulic resistance of fluid flow in a microchannel is studied.•Size dependence of heat transfer of microchannel heat sink is studied.•Effects of slip on hydraulic resistance and heat transfer are investigated.AbstractAs a well-accepted interfacial property, boundary slip condition is believed to affect hydraulic and thermal performances of various microanofluidic applications. By considering the boundary slip for water flow through a microchannel heat sink, size dependences of hydraulic resistance and heat transfer of the water flow in a group of elliptical microchannel heat sinks with the same channel cross-sectional area but different length ratios of semi-major and minor axes are re-examined. The present work finds that hydraulic resistance and heat transfer of water flow in a microchannel are strongly dependent on the geometric parameters of the channel and the boundary slip condition. Both the hydraulic resistance and the convective heat transfer coefficient of the water flow in the elliptical shaped microchannel decrease with the increasing hydraulic diameter of the channel. An elliptical shaped microchannel having the largest hydraulic diameter, namely a microtube with the minimum length ratio of semi-major and minor axes being equal to one, has the smallest hydraulic resistance and the smallest heat transfer coefficient. Boundary slip at the solid-liquid interface can attenuate the hydraulic resistance and enhance the heat transfer capacity of the water flow in a microchannel, and these effects of slip on the mass and heat transfer are size-dependent. For the microchannel with a smaller hydraulic diameter, slip has a more significant attenuation effect on the hydraulic resistance and a more significant enhancement effect on the heat transfer. Geometric size optimization combined with the effective regulation of boundary slip can be a potential method to improve the mass and heat transfer of fluid flow over the microanoscale.
机译： 突出显示 • 研究了微通道中流体流动的水力阻力的大小依赖性。 • 微通道散热器传热的尺寸依赖性为 • 研究了滑移对水力阻力和传热的影响。 摘要 作为公认的界面属性，边界滑移条件据信会影响各种微/纳流体应用的水力和热性能。通过考虑流经微通道散热器的边界滑移，在具有相同通道横截面面积但半长径比不同的一组椭圆形微通道散热器中，水流阻力与水流传热的大小相关性重新检查短轴。本工作发现，微通道中水流的水力阻力和传热与通道的几何参数和边界滑移条件密切相关。椭圆形微通道中水流的水力阻力和对流传热系数都随着通道水力直径的增加而减小。具有最大水力直径的椭圆形微通道，即半长轴和短轴的最小长度比等于一的微管，具有最小的水力阻力和最小的传热系数。固-液界面处的边界滑移可以减弱水力阻力，并增强微通道中水流的传热能力，并且滑移对质量和传热的这些影响取决于尺寸。对于具有较小水力直径的微通道，滑移对水力阻力具有更显着的衰减效果，并且对热传递具有更显着的增强效果。几何尺寸优化与边界滑移的有效调节相结合，可以成为改善微纳尺度上流体流动的质量和传热的一种潜在方法。

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