本研究以微槽道结构蒸发器为研究对象,以TiO2/R141b纳米流体为工作介质,在不同运行压力条件、不同纳米流体体积分数下对蒸发器的传热特性进行了实验研究.运行压力为0.86×105 Pa、1.0×105 Pa,纳米颗粒的体积分数范围为0.001％～0.1％.运行压力为0.86× 105 Pa时,体积分数为0.001％、0.01％纳米流体会具有明显的强化换热的效果;体积分数为0.1％的纳米流体在高热流密度时出现传热恶化的状况.在运行压力为1.0×105 Pa时,体积分数为0.001％、0.01％的强化效果不明显,而体积分数为0.1％的纳米流体随着压力的增加,传热恶化程度加剧.本研究还对纯工质在微槽道结构表面纳米颗粒沉积层的蒸发/沸腾传热特性进行了实验研究,实验结果表明;纳米粒子沉积层的存在对纳米流体在微槽道结构内蒸发/传热特性具有重要的影响.
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