适于窄缝流动沸腾传热的关系式

Flow Boiling Heat Transfer Correlation for Narrow Channel

由于受窄缝间隙几何尺寸的限制,在加热的窄缝流道中沸腾气泡随着其长大和流动将受挤而变形、聚合,其表面张力的作用将大幅度改变。本文通过引入Bond无量纲数来考虑窄缝流道的窄缝几何效应和气泡表面张力作用,修正了Chen沸腾传热关系式,并提出了相应的窄缝流动沸腾传热计算的关系式。通过与实验数据的验证比较,修正Chen沸腾传热关系式的计算结果与实验结果比较吻合,因此,该关系式能够用来预测在单面加热窄缝流道中的两相沸腾传热系数。

As a result of dimensional limit in narrow gap,bubbles are deformed and coalesced by squeeze as they are growing and flowing along a heating narrow channel.And their surface tension effects are altered greatly.In this paper a flow boiling heat transfer correlation is putted forward by modifying the Chen correlation with dimensionless Bond number,which considers the geometrical effect of narrow channel and bubble surface tension effect.The calculation results with the modified Chen correlation and original Chen correlation are compared with experimental data and it shows that the modified Chen correlation agrees well with the experimental data.Herewith,the correlation can be used to predict two -phase flow boiling heat transfer coefficient in narrow channel with one side heating.