FLOW BOILING HEAT TRANSFER OF THERMAL NANOFLUIDS IN MICROCHANNELS

为了实现微电子、微机械系统和化学微反应器等微系统的高热流密度冷却，本项目提出了热纳米流体，即含有高导电性纳米材料的悬浮液作为先进的换热流体。针对目前对热纳米流体的研究主要集中在大通道上的现状，提出了对稳定的热纳米流体在微通道(0.01-1 mm)内的流动沸腾换热进行系统的研究。与纯液体在微通道中的流动相比，这种新型的热纳米流体的应用可以进一步强化换热，克服微通道中的一些相关问题，特别是干涸现象。该项目将主要是试验性的，但将包括一些模型，以帮助理解沸腾机理。

Thermal nanofluids, suspensions containing high conductivity nanomaterials, are proposed as advanced heat transfer fluids in this project to achieve high heat flux cooling of micro systems such as the micro-electronics micro-mechanical-systems and chemical micro-reactors. As most of the research on thermal nanofluids has been focused on large channels, a systematic investigation of the flow boiling heat transfer of stable thermal nanofluids in microchannels (0.01-1 mm) is proposed. Compared with pure liquid flow in microchannels, such novel application of thermal nanofluids could further enhance heat transfer and overcome some associated problems in microchannels especially the dryout phenomena. The project will be primarily experimental but will incorporate some modelling to help to understand boiling mechanisms.