摘要
随着现代设备的微型化发展,微通道换热器由于体积小、换热强而受到广泛关注。由于在微尺度下,宏观传热机理已经不能适用,这使得在微尺度换热受更多因素影响。对微通道内相变传热、非相变传热等研究进行了综述,分析对比了微通道内不同的换热形式的研究现状。在非相变问题上,发现通道形状对流型并无影响,纳米流体能够有效促进换热,但两相流的换热问题以及不同种类的纳米流体优越性问题尚未研究。在相变问题上,质量流量、水力直径和热流量会影响冷凝换热和压降,工质种类、宽高比等会影响蒸发换热,但壁面粗糙度、通道形状等对相变传热的影响程度并未研究。
With the miniaturization development of modern equipment, the microchannel heat exchangers have attention due to their many advantages, such as small size and strong heat transfer. Microchannel heat exchange has become a focus of modern scholars. The researches on the phase transition heat transfer and non-phase transition heat transfer in microchannels are reviewed, and the research status of different heat transfer modes in microchannels is analyzed and compared. On the non-phase transition issue, it is found that flow pattern has not been affected by channel shape, nanofluids can effectively promote heat transfer, but the two-phase flow heat transfer and the superiority of different types of nanofluids have not been studied. On the phase transition issue, mass flow, hydraulic diameter and heat flow will affect the condensing heat transfer and pressure drop. The type of work fluid, and aspect ratio will affect the evaporative heat transfer. However, the influence of wall roughness and channel shape on the phase transition heat transfer has not been studied.
作者
张灿
祁影霞
ZHANG Can;QI Ying-xia(School of Energy and Power Engineering,University of Shanghai for Sci. & Tech. ,Shanghai 200093,China)
出处
《建筑节能》
CAS
2019年第3期75-80,共6页
BUILDING ENERGY EFFICIENCY
关键词
微通道
相变传热
非相变传热
microchannel
phase transition heat transfer
non-phase transition heat transfer
