No abstract

No abstract

A minimally intrusive multi-thermocouple probe for the measurement of instantaneous wall heat fluxes in a boundary layer was developed. It was based on a phenomenological model involving the temperature equation in the flow and a Taylor series development of the conductive heat flux at the wall. The flux-meter was applied to a non-isothermal T-junction operating at a low value of the momentum flux ratio, exhibiting Kelvin–Helmholtz rolls in the interface between the hot and cold fluid. The results demonstrated that instantaneous wall heat fluxes presented large fluctuations due to fluid flow events. In addition, a narrow region was found where film cooling occurs. Such results could not be obtained by using correlations based on a reference temperature or employing embedded measuring devices.

No abstract