Abstract:
Heat and flow pattern of a vertical free jet impinging on a hot disk were numerically investigated. A
cylinder with various thicknesses and materials exposed simultaneously to uniform heat flux on one
side and a free impinging jet on the other side is simulated by ANSYS Fluent 19.3. For simulations, the
thermal boundary condition on the hot surface might differ due to the nature of the heat flow. The
Volume of Fluid (VOF) approach is used to model the free jet heat transfer and fluid dynamics with the
presence of air, while only the energy equation is solved in the cylinder. Heatline equation is solved to
reveal the heat flow direction and effects of different geometry conditions. The maximum heat flux
of 2.5MW/m2was obtained at the edge of stagnation region for hot target made of copper, while the
value was 1.5 MW/m2 when the material was combined with stainless steel. However, the general
thermal and hydrodynamic features of the jet flow were not influenced. It means that hot object
condition may only affect the balance between heat flux and temperature, and the ideal uniform
heat flux on the impinging wall may not be achieved in any experimental conditions.
