Prediction of flow boiling heat transfer of carbon dioxide inside small diameter tubes

Abstract

Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.This paper reviews recent experimental work on intube flow boiling of carbon dioxide and describes the updated flow boiling heat transfer model and flow pattern map proposed by Cheng, Ribatski, Wojtan and Thome [1] for evaporation of carbon dioxide in small diameter horizontal tubes. This new flow boiling heat transfer model predicted 76% of the CO2 database taken from the literature within ±30%. The new model and map are applicable to: tube diameters from 0.8 to 10 mm, mass velocities from 170 to 570 kg/m2s, heat fluxes from 5 to 32 kW/m2 and saturation temperatures from -28°C to 25°C (reduced pressures from 0.21 to 0.87). Simulations of the flow pattern map and heat transfer model are also shown.