Heat Transfer Analysis of Force Fed Evaporation on Microgrooved Surfaces

Force Fed Evaporation (FFE) technique was parametrically analyzed using refrigerant R245fa over a 1cm² microgrooved surface. The heat transfer tests were performed so as to isolate the effects of heat flux, mass flux, and saturation pressure and to identify the dominant heat transfer mechanism in FFE. In particular, results were obtained for selected values of mass flux with various heat flux levels, as well as for selected values of heat flux with various saturation pressure levels. Tests were performed for heat fluxes up to 562W/cm2 and qualities up to 29%. For these conditions, it was found that heat transfer is mainly dependent on heat flux, and not on mass flux or quality. This further implies that the dominant heat transfer mechanism is nucleate boiling.