Abstract
The effects of nozzle contraction ratio on the flow and heat transfer characteristics of orifice impinging jet are investigated experimentally. The nozzle diameter is do=10.0mm=const., and the contraction ratio CR= (do/di) 2, where di is pipe diameter, and the nozzle-plate distance are changed CR=1.00 to 0.11 and H/do=2.0 to 5.0, respectively. The Reynolds number based on do is Re=15000 =const. The flow characteristics are made clear by measurements of pressure and velocity distributions on the plate and flow visualization. The Nusselt number obtained by the measurements of temperature distribution on the plate for the orifice impinging jet of CR=0.11 and 0.69 were 19% and 9% higher than those of the pipe impinging (CR=1.00), respectively, because the centerline velocity of the orifice jet is larger than that of the pipe jet. Under the same operation power an orifice impinging jet has an enhanced heat transfer characteristics.
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