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微槽群表面喷雾冷却换热特性

Keywords: 喷雾冷却,微槽群表面,换热特性研究,热流密度

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Abstract:

在闭式循环喷雾冷却系统中,以蒸馏水为工质,喷雾体积通量从0.938L/(m2·s)增至12.73L/(m2·s)的情况下,实验研究了微槽群表面的槽道尺寸对喷雾冷却换热性能的影响.结果表明:微槽群表面可明显提升换热效果,提升程度取决于槽道尺寸和喷雾流量.小流量(1.146~1.604L/(m2·s))时,最佳槽面结构槽深、宽、间距分别为0.5、0.4、0.6mm;大流量(12.73L/(m2·s))时,最佳槽面槽深、宽、间距分别为0.5、0.2、0.4mm,在表面温度为80℃时,其热流密度达202.5W/cm2.从光面喷雾与微通道流动换热相结合的角度,给出了微槽群表面喷雾冷却强化换热机理;推导了反映蒸发换热特性和槽道尺寸对换热影响的微槽群表面量纲一换热准则方程,可方便用于工程设计.

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