Experimental Study on Heat Transfer Characteristics of a Moving Single-Nozzle Jet Impingement

抄録

A heat transfer model developed under conditions analogous to industrial online quenching demonstrates enhanced relevance and applicability to real-world manufacturing processes. This research explores the heat transfer characteristics of a single nozzle jet impinging on a steel plate closely resembling industrial environments, primarily focusing on the wetted area, heat flux density, and temperature drop at different widths and depths in the wetted zone. Key experimental parameters include the initial temperature of the steel plate (T₀), jet impingement velocity (v_j), and the moving speed (v_m) of the plate. The T₀ ranges from 750°C to 450°C, v_j varies between 2 and 7 m/s; and v_m ranges from 0.07 to 0.28 m/s. Heat transfer characteristics within the wetted region strongly correlate with T₀, v_j and v_m, with the impact point exhibiting the highest sensitivity. Furthermore, the temperature drop along the depth is influenced not only by these parameters but also by the depth itself. Mathematical expressions are proposed to predict the peak heat flux density and temperature drop based on external parameters (T₀, v_j, v_m). This study deepens the understanding of heat transfer dynamics in moving jet cooling and provides a comprehensive three-dimensional perspective on jet impingement heat transfer.