Experimental study on influence of spray cooling on heat transfer of copper oxide nano-fluid
In order to study the heat transfer law of nanofluids in spray cooling of shipborne power directional energy weapons,the heat transfer characteristics of spray cooling under the in-fluence of working medium parameters and system parameters are analyzed by means of experi-ments and simulations with copper oxide nanofluids as working medium.The results show that the heat transfer of nanofluids is better than that of pure water,and the smaller the particle size is,the more obvious the effect is.However,when the heating power exceeds 1 000 W,the enhance-ment effect of nanofluids on heat transfer gradually weakens.The smaller the particle size,the smaller the enhancement effect and even the deterioration of heat transfer.The effects of nanofluid density and spray flow rate on heat transfer have a change law of first promoting and then weake-ning.Nanofluids play a certain role in promoting the uniform temperature distribution on the heat dissipation surface.It can reduce the foaming phenomenon of nano-solution by adding 0.004％dispersant.The heat transfer coefficient is increased by 1.77％,but when the mass fraction in-creases to more than 0.007％,the nanoparticles harden and the heat transfer is weakened.
spray coolingnanofluidparticle sizemass fractionheat transfer coefficient
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