Jet impingement cooling of vertical moving plate is widely employed in the energy and metallurgical industries. To improve heat transfer and the cooling of these plates in a vertical channel, an innovative stepwise jet cooling design model was proposed in the present study. To investigate the heat transfer enhancement mechanism of this multiple jet cooling, mixed convection in a three-dimensional model of a soaking zone and a jet impingement cooling tower was simulated using the commercial program ANSYS CFX. Navier–Stokes equations, which were solved using the SIMPLEC algorithm, enclosed by an RNG k-ε two-equation turbulence model were employed to calculate the fluid flow and heat transfer. Based on observations of the airflow velocity vector and temperature distribution, the critical equilibrium state for buoyancy and the inertia force was found to occur at a combined Reynolds number of 1.40 × 10⁷. Based on this double-enhancement effect and the effect of different nozzle heights, a multiple stepped jet impingement cooling design that jet velocity decreased with its height increasing was applied to a vertical alloying furnace. The Nusselt number for stepwise jet cooling in the vertical alloying furnace was 111–118% higher than that for constant jet cooling. Therefore, the stepped jet cooling model offers greater energy conservation than does constant velocity when the total jet flow mass is held constant.

垂直移动板的射流冲击冷却广泛应用于能源和冶金行业。为了改善垂直通道中这些板的传热和冷却，本研究提出了一种创新的逐步喷射冷却设计模型。为了研究这种多射流冷却的传热增强机制，使用商业程序 ANSYS CFX 对均热区和射流冲击冷却塔的三维模型中的混合对流进行了模拟。使用 SIMPLEC 算法求解的 Navier-Stokes 方程被 RNG k-ε 两方程湍流模型包围，用于计算流体流动和传热。基于对气流速度矢量和温度分布的观察，⁷ . 基于这种双重增强效应和不同喷嘴高度的影响，将射流速度随高度增加而降低的多级射流冲击冷却设计应用于立式合金化炉。立式合金化炉中逐步喷射冷却的努塞尔数比恒定喷射冷却的努塞尔数高 111-118%。因此，当总射流质量保持恒定时，阶梯式射流冷却模型比恒定速度提供更大的能量守恒。