AN EXPERIMENTAL INVESTIGATION OF REWETTING OF HOT HORIZONTAL SURFACE BY BOTTOM JET IMPINGEMENT
Present paper reports the rewetting behavior of 0.15mm thick hot horizontal stainless steel foil (SS-304) by circular impinging jet from bottom side through experimental investigation. The transient temperature of the hot foil is recorded by using thermal imaging camera (A655sc, FLIR system). Tests are performed for varied range of Reynolds number (Re=2500-10000), nozzle to plate distance (z/d=4-10) and initial surface temperature 500±10°C. Transient temperature obtained from thermal imaging camera is used to evaluate various parameters such as: rewetting time, rewetting temperature and rewetting velocity. Based on the experimental investigation correlations have been proposed to predict various parameters such as: rewetting temperature and non-dimensional rewetting velocity as a function of various parameters, namely, Reynolds number, non-dimensional radial distance and non-dimensional nozzle to plate distance.