纳米流体饱和池沸腾传热及CHF模型研究

纳米流体传热是一种新兴的换热方式,目前研究多集中在单相研究领域,而纳米流体沸腾传热特性的相关研究较少。本文采用热通量拆分方法,将壁面传热分为4种模型(微液层蒸发、气泡脱离前的瞬态导热、气泡脱离后的瞬态导热以及微对流换热),对这4种模型的传热量分别进行计算,结合壁面核化中心密度等参数,计算了壁面平均传热系数和CHF。结果表明,本文计算结果与国际上已发表的实验数据符合较好,充分验证了所建立模型的合理性。

Study of Nanofluid Saturated Pool Boiling Heat Transfer and CHF Model

Nanofluid heat transfer is a new heat transfer form,most studies focus on single phase heat transfer,while two-phase boiling heat transfer on nanofluid is not studied so much.In this paper,the total heat transfer was divided into four parts using heat flux partitioning method,including microlayer evaporation,transient conduction before bubble departure,transient conduction after bubble departure and micro-convection.The heat transfer for the four models was calculated individually and other parameters such as nucleation site density were calculated to predict the average heat transfer coefficient and CHF.The results show that the analytical results and experimental data agree well,which verifies the analytical model.