Investigation of the unsteady-state heat transfer in the region of a stagnation point in plane and axisymmetric flows

Attention is given to experimental and theoretical results for heat transfer on the upstream side of a sphere and a transversely oriented cylinder that are immersed in a gas flow, under the steady state conditions that result from a stepwise change in the flow or the body temperature. In the case of viscous flow at low velocities, heat transfer coefficient change due to a single stepwise change of flow temperature outside the boundary layer can be detected by the experimental method described in the literature. The present calculations also show that the thermophysical properties of the barrier material and its thickness influence the formation of heat transfer characteristics in an unsteady state process.