NUMERICAL STUDY ON COOLING CHARACTERISTICS OF MULTIPLE IMPINGING JETS INCLUDING THE EFFECT OF TURBULENCE

난류 효과를 포함한 다중 충돌 제트의 냉각 특성에 대한 수치적 연구

Free surface impinging jet on a moving plate, which is applicable to cooling of hot metals in a steel-making process, is investigated numerically by solving the Navier-Stokes equations in the liquid and gas phases. The free surface of liquid-gas interface is tracked by a level-set method which is improved by incorporating the ghost fluid approach based on a sharp-interface representation. The method is further improved by employing a nonequilibrium $\kappa-\varepsilon$ turbulence model including the effect of low Reynolds number. The computations are made to investigate the effects of the nozzle pitch, moving velocity of plate and jet velocity on the interfacial motion and the associated flow and temperature fields.