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针对高热流密度负荷下大功率电力电子设备散热冷却,该文以带有微槽道强化传热面的小型重力型平板热管蒸发器为研究对象,以水-氧化铜纳米颗粒组成的纳米流体为工质,在不同运行压力和不同纳米流体浓度下对平板热管蒸发器的沸腾换热特性以及临界热通量(CHF)进行了实验研究。结果表明:压力对平板热管蒸发器的沸腾换热特性和CHF有强烈影响,沸腾换热系数和CHF随压力降低而大幅度增加。纳米流体浓度对沸腾换热系数和CHF也有重要影响,在低浓度时,沸腾换热系数和CHF随浓度增加而缓慢增加。但是在浓度超过1.0%时,浓度对CHF的影响基本消失,换热特性反而恶化。研究证明,以水-氧化铜纳米颗粒组成的纳米流体可以明显地强化重力型热管蒸发器换热特性。
Aiming at the cooling and cooling of high power electronic devices with high heat flux density, this paper takes a small gravity plate heat pipe evaporator with micro-channel enhanced heat transfer surface as the research object. The nano-fluid consisting of water-copper oxide nanoparticles The boiling heat transfer characteristics and critical heat flux (CHF) of flat plate heat pipe evaporator under different operating pressures and different nanofluid concentrations were studied experimentally. The results show that the pressure has a strong influence on the boiling heat transfer characteristics and CHF of the flat tube heat pipe evaporator. The boiling heat transfer coefficient and CHF increase with the decrease of pressure. The nanofluid concentration also has an important effect on the boiling heat transfer coefficient and CHF. At low concentrations, the boiling heat transfer coefficient and CHF increase slowly with increasing concentration. However, when the concentration exceeds 1.0%, the effect of concentration on CHF almost disappears, and the heat transfer characteristics deteriorate instead. Studies have shown that nano-fluid consisting of water-copper oxide nanoparticles can significantly strengthen the heat transfer characteristics of gravity heat pipe evaporator.