高温平板滞止区内饱和水喷流沸腾传热最大热流密度

Critical Heat Flux of Saturated Water Jet Impingement on Stagnation Zone of Hot Surface

对高温平板滞止区内饱和水喷流冲击沸腾的临界热流密度进行了理论解析和实验研究.根据气液两相流稳定性理论得到了气泡层下最大液膜底层厚度,并由最大液膜底层厚度和液膜平均流速,建立了一个预示临界热流密度的半理论方程.方程系数由稳态实验数据拟合得到.研究结果证明,临界热流密度取决于滞止冲击速度和喷流直径,半理论半经验式能较好地预示实验结果.

A theoretical analysis and an experimental investigation were carried out for predicting the critical heat flux (CHF) of convective boiling for a round saturated water jet impingement on the jet stagnation zone of a hot surface. The model of the maximum liquid subfilm thickness based on the Helmholtz instability was used to derive a semi-theoretical equation for predicating CHF, and the correlation factor was determined from the experimental data and other researchers. The experimental results found that the CHF is a function of the impact velocity and the jet diameter. Finally, a semi-theoretical correlation was proposed for predicting the CHF of convective boiling for saturated water jet impinging on the jet stagnation zone. The obtained correlation agrees reasonably well with the existing experimental data.