Numerical Simulation on the Impact Cooling of Multi-Nozzle Jet for Hot-Rolled L-Beam and Industrial Test

The consistency of cooling greatly influences the quality of L-beams. In this paper, the process of cooling high-temperature L-beams by multi-jet impingement is numerically simulated. The VOF model and Realizable k-epsilon turbulence model were used, and the reliability of the Realizable k-epsilon turbulence model was verified using experiments. The jet flow rate is mainly 3-11 L/min. Numerical simulation calculations were used to obtain the distribution law of pressure, streamline, and wall shear of the flow field of the multi-nozzle jet impinging on the surface of the L-beam, as well as the distribution of Nusselt number of the L-beam and the temperature distribution at 1/2 thickness. The results suggest that the cooling uniformity of the L-beam can be enhanced by extending the cooling duration of the short edge or by concurrently increasing the water flow and time of the short edge. Based on the above strategy, a relevant industrial test program was developed. After the jet impingement cooling experiment, the L-beam's surface temperature differential decreased by 43.9 degrees C, and the bending of the L-beam was decreased by 10.4 cm. The maximum value of the magnetic field gradient associated with the stress in the L-beams was reduced by up to 80.2%.