FLOW BOILING HEAT TRANSFER OF THERMAL NANOFLUIDS IN MICROCHANNELS

热纳米流体是一种含高导电性纳米材料的悬浮液，是本课题提出的一种先进的传热流体，用于实现微电子、微机械系统和化学微反应器等微系统的高热流密度冷却。由于热纳米流体的研究大多集中在大通道上，因此提出了对稳定热纳米流体在微通道（0.01-1 mm）内流动沸腾换热的系统研究。与纯液体在微通道中的流动相比，这种新型热纳米流体的应用可以进一步增强微通道中的传热能力，并克服微通道中存在的一些相关问题，特别是干化现象。该项目将主要是实验性的，但将结合一些模型来帮助理解沸腾机制。

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.