竖直矩形可视化流动沸腾换热实验台的设计及初步研究

Design and Preliminary Study on Vertical Rectangle Visualization of Flow Boiling Heat Transfer Experiment Platform

为了了解矩形窄通道内流动沸腾及传热现象的机理,建立了单面加热竖直矩形窄通道可视化流动沸腾换热实验台进行了实验。实验结果表明:矩形窄通道流动沸腾过程的换热系数存在最大值;随着干度的增加(即热流密度的增加)其换热系数逐渐降低,转为以液膜蒸发为主的流动沸腾换热,此时需控制热流密度,避免干涸现象的发生。

A single-side heating apparatus is set up to study the flow boiling and heat transfer in vertical narrow rectangular channel together with high speed video camera to get the flow images in the channel. The experiment results show that： the heat transfer coefficient exists a maximum value; Heat transfer coefficient gradually decreases with increasing thermodynamic vapour quality （heat flux increasing）, and flow type tunas to liquid film evaporation, at this case it necessarily needs to control heat flux to avoid the occurrence of dry-out.