Thermal boundary condition analysis of cooling objects exposed to a free impinging jet using the heatline concept

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