Structure optimization of straight cone nozzle and its effect on jet impingement heat transfer

In order to reduce the pressure loss of the nozzle and boost the efficiency of jet impingement heat transfer, this article takes the flow coefficient as the target variable and uses response surface methodology to optimize the straight cone nozzle's internal structure. The optimal structural parameters obtained are as follows: the contraction angle is 30° and the lengths of the contraction section and the outlet section are 5 and 2 times of the outlet diameter, respectively. Besides, the influence of nozzle structural parameters on the heat transfer characteristics of a single water jet impinging on a high-temperature steel plate are simulated by ANSYS-Fluent. According to the results, the optimized nozzle has the largest flow coefficient, and the average Nusselt number on the steel plate is also the largest under the same inlet pressure.