An analytical approach is presented to analyse flashing induced instabilities in two-phase flow systems. Averaged conservation equations of the drift flux model are used describe flow. For closure these equations, Flashing Boundary, ?fl and Gas Generation due Flashing, ?g,fl have been derived from constitutive relationships for working fluid. A few models developed discussed. The thus solved sm...

The evacuated tube solar collector ETC is studied intensively and extensively by experimental andtheoretical works, in order to investigate its performance enhancement of heat transfer, for Baghdad climatefrom April 2011 till the end March 2012. Experimental work carried out on a well instrumented collectorconsists 16 tubes aspect ratio 38.6 thermally insulated tank volume 112L. relationbetween...