Spray impingement cooling is the major method currently used to cool steel after the hot-rolling process. In this study, dual nozzles are used to investigate the cooling character of the flat plate using for the spray impingement cooling process. Based on an experimental temperature measurement, a three-dimensional numerical model is set up to calculate the transient heat transfer coefficient of the cooling plate by solving the inverse heat conduction problem with the conjugate gradient method. Both the experimental and numerical results indicated that an interference region appeared between the two jet spray impingement regions. The interference pitch varied with the flow rates, the height from the plane to the jet outlet, and the distance between the two jets. As water spread over the plate, the heat dissipation region gradually stretched from the impingement region to the interference and flow regions. A peak in the heat flux curve was observed when the water arrived at the wet front of the flow. Meanwhile, the peak in the heat flux decreased as the distance from the impingement region increased. A maximum local heat transfer coefficient 23,000 W/(m²K) was observed in this experiment. The global average heat transfer coefficient increased with increases in the water flow rate, but it decreased with increases in the pitch.

喷射冲击冷却是目前热轧后冷却钢的主要方法。在这项研究中，使用双喷嘴研究用于喷雾冲击冷却过程的平板的冷却特性。在实验温度测量的基础上，建立了三维数值模型，通过共轭梯度法求解逆热传导问题，计算了冷却板的瞬态传热系数。实验和数值结果均表明在两个喷射喷雾撞击区域之间出现了干扰区域。干扰节距随流速，从飞机到喷嘴出口的高度以及两个喷嘴之间的距离而变化。当水散布在盘子上时，散热区域从撞击区域逐渐扩展到干扰和流动区域。当水到达流的湿前沿时，观察到热通量曲线的峰值。同时，热通量的峰值随着距撞击区域的距离增加而减小。最大局部传热系数23,000 W /（m在此实验中观察到² K）。全球平均传热系数随水流量的增加而增加，但随着螺距的增加而减小。