Fundamental Study for a Two-Phase-Flow Water Wheel by Means of Boiling of Liquid Freon Injected in Water : 2nd Report, Experimental Study on Acceleration Mechanism

Abstract

A mechanism to accelerate hot water in a pipe by boiling of liquid freon injected in the hot water was developed with the final objective of driving a Pelton wheel. Convergent, convergent-parallel and two convergent-divergent nozzles were used as the two-phase nozzles. The effect of the nozzle shape and the location of the freon injection were investigated. The temperature characteristics of water and amount of freon injection were measured. The convergent-divergent nozzle showed good results in energy conversion. At high temperature, some results showed higher values than theoretically estimated maximum values which were derived by considering only the boiling of liquid freon. This phenomenon was assumed to be a result of vaporization of water by agitation by freon gas at the nozzle, and this was confirmed experimentally by injecting air instead of liquid freon.