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Kengkla Kunnarak


          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.


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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
Research Article


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