On Numerical Investigation of Non-dimensional Constant Representing the Occurrence of Secondary Peaks in the Nusselt Distribution Curves

The characteristic study of heat dissipation rate is done with by numerically evaluating the radial distribution of Nusselt magnitudes over a flat plate. These profiles are reported for various injection and geometric parameters in the present research. A very contagious look towards these profiles shows the occurrence of secondary and localized rise. However these local rises are observed provided the Nusselt profiles are accurately predicted. To achieve this, the present research takes an effort in numerically simulating a computational domain, analogous to actual experimental conditions. The computational simulations at lower nozzle-target spacing and higher impinging velocity revels the occurrence of secondary rise in Nusselt profiles. A very less light is observed in determining the exact cause and the intervening range for the occurrence of such peaks in the profiles. Looking into this, the current research focuses on the determination of the critical constant and its magnitude within which these peaks exist in the profile. The non-dimensional constant representing the critical magnitude is defined as a ratio of diameter based Reynolds number with nozzle - target spacing (Z/d). A very judicious look towards the velocity contour conveys the occurrence of turbulence flow in near wall region to be responsible for the secondary rise in heat transfer rate.