Heat transfer studies of the oblique impingement of round jets upon a curved surface

摘要

The effect of jet inclination of the local heat transfer under an obliquely impinging round air jet striking on isothermal circular cylinder is experimentally investigated. The circumferential heat transfer distribution as well as axial Nusselt number is measured. The consid- ered parameters are jet Reynolds number in range of 3800-40,000, and jet inclination angle, ranging from 90 to 20. the experiments are carried out for nozzle sizes, d =3, 5 and 7 mm, and separation distance from 7 to 30 of the nozzle diameter. The output results indicated that the point of maximum heat transfer along the x-axis is shifted upstream and the local heat transfer distribution changed as a function of jet inclination. The magnitude of the shift was found to be significantly higher than that observe for a flat plate.