HEAT TRANSFER FROM A PULSED TURBULENT IMPINGING JET AT LARGE TEMPERATURE DIFFERENCES

Impinging jet flows of various geometric designs are commonly used in industrial drying applications for drying of paper, coatings, textiles etc. Despite the massive R&D effort in this field there are still gaps in our fundamental knowledge and ability to predict the flow and heat transfer characteristics under a wide variety of geometric, flow and thermal conditions encountered in practice. In this work we apply a turbulence model with unique near wall treatment for a rather complex case of a planar impinging jet subjected to medium frequency oscillations cooling a heated surface with large temperature differences between the jet fluid and the wall. Such predictive ability will be helpful for designers who wish to consider pulsing impinging jets for enhanced heat transfer for drying, heating or cooling applications.