  In this work, some of the parameters influencing the cooling capacity of a
liquid jet impinging onto Inconel 718 and C45 plates were experimentally
investigated. The experiment included a high-speed camera to record the dynamic
of the jet during the cooling process while an infrared camera was used to
record the temperature field at the opposite surface. Jets made of water and
oil-in-water emulsion were analysed as well as the influence of the oil
concentration. Other parameters studied here include initial temperature of the
plate, nozzle-to-plate distance, nozzle diameter, jet velocity, and impinging
angle. The cooling performance was analysed by solving a full 3D inverse heat
transfer problem (IHTP) with the Conjugate Gradient Method (CGM) implemented in
a new solver in OpenFoam. The basic organization and implementation of the
solver is shown, followed by its validation with a made-up case. Finally, the
growth of the wetting front was analysed for different oil concentrations and a
combination of nozzle diameters and jet velocities for the same flow rate. For
the latest, unexpected results emerged when comparing the wetting growth for
the two plate materials.
