COOLING OF A HOT SURFACE BY ORIFICE NOZZLE

Main Article Content

Kengkla Kunnarak

Abstract

          This paper studied cooling of a hot surface by orifice nozzle with 3 different styles, orifice nozzle, orifice nozzle with narrow chamfer and orifice nozzle with wide chamfer. The results obtained are compared with conventional nozzle. Orifice nozzle diameter D = 20 mm and the tip of the orifice nozzle has a diameter d = 18 mm. Using air as working fluid at flow rate in term of the Reynolds number, constant at 10,000. nozzle-to-plate spacings z = 40, 80, 120 and 160 mm. The results showed that orifice nozzle helps cooling on surface higher than conventional nozzle. Orifice nozzle experiment at nozzle-to-plate spacing z = 120 mm gave highest cooling in term of the Nusselt number. It may be caused by the tip of the orifice breaking down the flow layer the exit area causes turbulent flow helps to create better cooling.

Article Details

How to Cite
Kunnarak, K. (2020). COOLING OF A HOT SURFACE BY ORIFICE NOZZLE. Journal of Energy and Environment Technology of Graduate School Siam Technology College, 7(1), 13–19. Retrieved from https://ph01.tci-thaijo.org/index.php/JEET/article/view/240973
Section
Research Article

References

D.W. Colucci and R. Viskanta, “Effect of nozzle geometry on local convective heat transfer to a confined impinging air jet”, Experimental Thermal and Fluid Science 13 (1996) 71-80.

Luis A. Brignoni and S.V. Garimella, “Effects of nozzle-inlet chamfering on pressure drop and heat transfer in confined air jet impingement”, International Journal of Heat and Mass Transfer 43 (2000) 1133-1139.

Jungho Lee and Sang-Joon Lee, “The effect of nozzle configuration on stagnation region heat transfer enhancement of axisymmetric jet impingement”, International Journal of Heat and Mass Transfer 43 (2000) 3497-3509.

Puneet Gulati, Vadiraj Katti, S.V. Prabhu, “Influence of the shape of the nozzle on local heat transfer distribution between smooth flat surface and impinging air jet”, International Journal of Thermal Sciences 48 (2009) 602–617.

Ravish Vinze, S. Chandel, M.D. Limaye and S.V. Prabhu, “Effect of compressibility and nozzle configuration on heat transfer by impinging air jet over a smooth plate”, Applied Thermal Engineering 101 (2016) 293–307.