HEAT-TRANSFER IN HIGH-TEMPERATURE LIQUID JETS

This study focuses on the hydrodynamics and heat transfer of a very hi gh temperature liquid jet moving through air. The purpose was to deter mine the velocity and temperature fields in a jet of molten materials flowing from a furnace into casting devices. Understanding hydrodynami c and heat transfer properties of the jet is essential in controlling the flow and the solidification of molten products. The nonlinear equa tions that govern this physical problem were solved numerically using a finite-difference method applied to a laminar and axisymmetric flow with no fluctuation of the interface between the liquid jet and the co ntinuous phase. The exit velocity profile was analyzed in terms of its effect on liquid jet hydrodynamics and cooling properties; and the Pe clet number and jet emissivity in terms of their influence on the ther mal exchange. In addition to the theoretical approach, experimental va lues were provided to validate the numerical model. Jet diameter and s urface temperature profile values were measured and compared. The nume rically analyzed jet diameter contraction and surface temperature valu es were consistent with those obtained experimentally.