双侧加热窄环隙流道强迫对流换热

本文用一回路水对竖直窄环隙流道进行了双侧加热强迫对流换热实验,将双侧加热和单侧加热时的换热特性进行了对比分析。结果表明,双侧加热使流道内侧的换热得到加强,而外侧换热却受到削弱,具有与单侧加热时相似的变化规律,综合因素影响使换热量基本保持不变。

Forced Convection Heat Transfer in Narrow Annulus with Bilateral Heating

Experiments were conducted to study the single-phase forced convection heat transfer with water in vertical narrow annulus which is simultaneously heated from inside and outside by primary water. A comparative analysis on heat transfer performance between bilateral and unilateral heating was carried out.The results indicate that double side heating enhances the heat transfer on inside surface when Reynolds number is higher and reduces the heat transfer on outside surface when Reynolds number is small, compared with single-side heating. For both heating modes, the varying trend of Nusselt number is similar and the total heat transfer rate keeps almost equal in value.