Simulación mediante CFD del proceso de ebullición forzada del refrigerante orgánico 600a en tubos cuadrados de hasta 3 cm de lado

Abstract

The purpose of the following investigation is to compare the development of the boiling in an analytical and numerical way, by means of the heat transfer coefficient for two phases and the steam quality with the refrigerant R600a, inside a square steel tube up to 3 cm sideways with thicknesses of 1.5 and 2 mm, heat flows of 10,000, 15,000 and 20,000 W / m2, two mass flows 300 and 400 kg / m2, the simulation is carried out using software for computational fluid dynamics (ANSYS fluid). Finding an increase in steam quality for high heat fluxes and with low thicknesses, however, when the pipe is 2.5 cm side the quality is retained despite the reduction in the thickness of the tube wall. Finally, find the maximum phase change by boiling in a square tube for 2 cm side, flow of 400 kg / m2 · s, heat of 20,000 W / m2 and thickness of 1.5 mm, 88% steam for the central point in the exit edge condition.