Experimental average Nusselt number characteristics with inclined non-confined jet impingement of air for cooling application

• Experimental inclined jet heat transfer characteristics are investigated.
• Experiments are performed at angle of 15° < θa < 75°, with inclined jet at Reynolds Number 2000 ⩽ Re ⩽ 20,000.
• Average Nusselt Number are analyzed for inclined jet cooling.
• Imperial correlations of H/D, Reynolds Number, and Angle Ratio developed.

Jet impingement is exceedingly operational for numerous field applications including electronics cooling and process industry. Its implementation comfort makes it common for many applications. The paper deals with investigation of heat transfer characteristics of a cooling flat surface. It is cooled by air jet impinged at an inclination of 15–75° to target plate. For understanding variation in cooling performance, comprehensive experiments are performed with different configurations of inclined jets on hot surface. For simplicity in using air, it is recommended for verity of applications as cooling fluid. Air Inclined jet with Reynolds Number in the range of 2000 ⩽ Re ⩽ 20,000 is examined for the circular Inclined jet. The target to inclined jet perpendicular height (H) is varied from 0.5 ⩽ H/D ⩽ 6.8 for understanding effect of H on cooling performance of different locations on target plate. The investigation leads to equations for average Nusselt Number for inclined non-confined air jet for cooling applications.