The submerged jet impingement boiling is one of the most effective heat transfer methods in dissipating both transient and steady concentrated heat loads. However, studies on the submerged jet impingement boiling still lack experimental data, especially for the heat transfer characteristics of the onset of nucleate boiling (ONB). Therefore, an experimental study of a submerged circular jet impinging on a polished copper surface is conducted in the subcooled water. The experiments investigate the steady-state heat transfer characteristics at the stagnation point from single phase convection to partial nucleate boiling. The effects of jet Reynolds number, liquid subcooling, and nozzle diameter on the onset of nucleate boiling are systematically studied. The experimental results show that the single phase convective heat transfer can be enhanced by increasing jet velocity at a fixed nozzle diameter or decreasing nozzle diameter under the same jet Reynolds number. The liquid subcooling seems to have negligible effect on the single phase heat transfer coefficient. For the ONB point, it is found that the ONB wall superheat is not influenced by liquid subcooling or jet parameters. The ONB heat flux, on the other hand, is found to depend on the experimental parameters. Increasing the jet Reynolds number and liquid subcooling, or decreasing the nozzle diameter could broaden the single phase convective regime and delay the onset of nucleate boiling, in terms of heat flux. Empirical correlations are proposed for predicting the stagnation point heat transfer coefficient, heat flux, and wall superheat at the ONB point. The comparison between the predicted values and the experimental data indicates that the empirical correlations are able to predict the heat transfer characteristics of the onset of nucleate boiling within an acceptable accuracy under the applicable range.

浸没射流冲击沸腾是消散瞬态和稳态集中热负荷最有效的传热方法之一。然而，对浸没射流冲击沸腾的研究仍然缺乏实验数据，特别是关于开始核沸腾（ONB）的传热特性。因此，在过冷水中进行了浸没圆形射流撞击抛光铜表面的实验研究。实验研究了从单相对流到部分核沸腾的驻点处的稳态传热特性。系统研究了射流雷诺数、液体过冷度和喷嘴直径对核沸腾开始的影响。实验结果表明，在相同的射流雷诺数下，通过增加喷嘴直径固定的射流速度或减小喷嘴直径可以增强单相对流传热。液体过冷似乎对单相传热系数的影响可以忽略不计。对于ONB点，发现ONB壁面过热不受液体过冷度或射流参数的影响。另一方面，发现 ONB 热通量取决于实验参数。就热通量而言，增加射流雷诺数和液体过冷度或减小喷嘴直径可以扩大单相对流状态并延迟核沸腾的开始。提出了经验相关性来预测驻点传热系数、热通量、和 ONB 点的壁过热。预测值与实验数据的比较表明，经验相关性能够在适用范围内在可接受的精度内预测核沸腾开始的传热特性。