Abstract:

Experimental study on heat transfer characteristics of nanorefrigerant CuO-R113 flow boiling inside a horizontal smooth tube with total length 1.5m and outside diameter 9.52mm was performed.The test conditions were as follows: the mass flux is from 100 to 200 kg•m^-2•s^-1，the heat flux is from 3.08 to 6.16 kW•m^-2， the inlet vapor quality is from 0.2 to 0.7, the mass fraction of nanoparticles is from 0 to 0.5%.The experimental results showed that the heat transfer coefficient of nanorefrigerant CuO-R113 is larger than that of pure refrigerant R113, the flow boiling heat transfer is enhanced by adding nanoparticles.When mass flux is 100 kg•m^-2•s^-1, heat transfer coefficient increases 29.7% maximally.When mass flux is 150 kg•m^-2•s^-1, heat transfer coefficient increases 22.7% maximally.When mass flux is 200 kg•m^-2•s^-1, heat transfer coefficient increases 25.6% maximally.