Ansari, EmaadSiddique, Mohammed UmairKhan, Sher AfghanAkhtar, Mohammad NishatBakar, Elmi Abu2021-06-182021-06-182020Ansari, E., Siddique, U., Khan, S.A. et al. 2020, 'Numerical investigation of mathematical non-dimensional constant representing smoothness in the Nusselt profile', CFD Letters, vol. 12, no. 6, pp. 16-27.2180-1363 (online)10.37934/cfdl.12.6.1627http://hdl.handle.net/2263/80374Cooling of devices using air-jet and other fluid impingement has acquired pace in the manufacturing and electronic device industries. The cooling of the surface using liquid jets is studied using the Nusselt distribution profile. The pattern of the Nusselt profile becomes non-uniform when some parameters are wrongly selected. This may lead to heating of some locations instead of cooling of the surface. Thus research for keeping the Nusselt profile uniform is a primary task. The Nusselt profile depends mainly on the Reynolds number (Re) and nozzle-target spacing (Z/d). Therefore, the current study numerically evaluates the value of constant, which is a ratio of Reynolds number and nozzle-target spacing (C = Re/ (Z/d)) up to which the Nusselt profile remains uniform. The value of constant C is found to be 7400. Also, the present work uses a computational model for study, which is validated using grid independence test and turbulence modeling.en© 2020 PENERBIT AKADEMIA BARU - All rights reserved.Nusselt profileReynolds numberNozzle-target spacingMathematical non-dimensional constantCooling of devicesLiquid jetsEngineering, built environment and information technology articles SDG-04SDG-04: Quality educationEngineering, built environment and information technology articles SDG-07SDG-07: Affordable and clean energyEngineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-13SDG-13: Climate actionArticle