Experimental Study of Air Slot Jet Impingement Cooling From Cylinder Placed on a Flat Plate

The experimental study for air slot jet impingement cooling from the heated cylinder is carried out. The heated cylinder is placed on a flat plate. The flat plate has an effective dimension as plate length (P) from heat transfer point of view. The heating of the cylindrical surface is done by providing a constant heat flux. The various parameters which affect the heat transfer from the cylinder are Re-D, h/S, S/D, and P/D. The range of the parameters considered are Re-D= 10,000-25,000, h/S = 4-12, S/D = 0.072-0.108, and P/D = 0-2. The effect of various parameters on heat transfer distribution (stagnation and local Nusselt number) from the cylinder is investigated. The local Nusselt number has a maximum value at theta = 0 deg and then it decreases upto theta = 180 deg. This trend is observed for all the parametric variations. The stagnation Nusselt number (Nu(stag)) and local Nusselt number increases with the change of parameters as increase in Re(D)and S/D and decrease in h/S. However, Nu(stag)remains independent with the change in P/D. The correlation for stagnation and mean Nusselt number is developed using regression analysis as a function of Re-D, h/S, S/D, and P/D. The maximum error associated with the correlated value of Nu(stag)and Nu(m)as compared with the experimental data is observed as +/- 13% and +/- 25%.