Simulation of Jet Impingement Cooling of a Stationary Hot Steel Plate

The flow interaction and the heat transfer between an impinged water jet and a hot steel surface affects the cooling process at the run-out table (ROT) of the steel mills facility. Eventually, the steel quality in terms of the metallurgical and mechanical properties are affected. Most of the flow interaction and heat transfer for the jet impingement flow occurs at the near-wall region or the boundary layer. This work numerically investigates the multiphase jet impingement flow from a single circular nozzle over a stationary hot steel plate. The numerical study focuses on the boundary layer region using the CFD simulation package of ANSYS FLUENT software. As a result, refined mesh layers are modeled mathematically based on specific wall y+ numbers at three sublayer locations of the turbulent boundary layer region; viscous, buffer and fully turbulent sublayer. The u+ vs. y+ has been plotted at 15 mm radial location (from the axis of the circular nozzle jet). It shows a good agreement with the law of the wall for Von-Karman. Furthermore, the CFD simulation results have been verified by comparing the cooling curves of the available experimental data.