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Conflnement effects on nucleate boiling and critical heat flux in buoyancy- driven microchannels

机译:约束对浮力驱动微通道中核沸腾和临界热通量的影响

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摘要

Pool boiling and CHF experiments were performed for vertical, rectangular parallel-plate channels immersed in the dielectric liquid FC-72 at atmospheric pressure to elucidate the effects of geometrical confinement in immersion cooled electronics applications. Heat transfer enhancement in the low flux region of the nucleate boiling curve was observed for channel spacings near and below expected bubble departure diameters, but was widely different for two different heater materials. Relative degradation of CHF with decreasing channel spacing was found to be a strong function of channel aspect ratio and independent of surface material and finish.
机译:对于在大气压下浸入电介质液体FC-72中的垂直矩形平行板通道进行了池沸腾和CHF实验,以阐明在浸没冷却电子设备应用中几何限制的影响。对于接近和低于预期气泡离开直径的通道间距,观察到了在核沸腾曲线的低通量区域中的传热增强,但是对于两种不同的加热器材料却有很大的不同。发现随着通道间距的减小,CHF的相对降解是通道长宽比的强函数,并且与表面材料和表面光洁度无关。

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