EXPERIMENTAL RESEARCH ON CO_2 POOL BOILING HEAT TRANSFER OUTSIDE A SINGLE TUBE

摘要

Both theoretical and experimental research on CO_2 physical characteristics and pool boiling heat transfer are taken in this paper. It is analyzed that CO_2 pool boiling heat transfer outside the screwed and smooth tube based on experimental study. It is resulted with the relationship between heat transfer coefficient, evaporating pressure and the heat flux. It is also indicated the enhancement factors of three screwed tube compared with smooth tube. The results provides a basis for promoting CO_2 heat transfer enhancement, and also provides a theoretical support in engineering.