Abstract
The present paper describes the heat transfer characteristics of an annular turbulent impinging jet with a confined wall. The local temperature distribution on the impingement surface was obtained using a thermosensitive liquid crystal sheet and an image processor. The net heat flux was evaluated by considering the heat conduction in the heated section and the thermal radiation between upper confined insulated wall and impingement surface. Isothermal lines and iso-Nusselt number lines were obtained in two-dimensional form. Effects of diameter ratio, distance between nozzle and impingement surface and Reynolds number on radial distribution of local Nusselt number were examined. Experimental equations of local Nusselt number were obtained in power-law expression of r/rp for major and minor flow regions.
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