The Effect of Boiling SiO2-Water Nanofluid on Characterization of Boiling and Roughness of Surface in Different Regions of Boiling

In present study, boiling of water-silica nanofluid on circular flat plate heater was done. For observing the effect of concentration on critical heat flux and boiling heat transfer coefficients, three concentration 0.005, 0.007 and 0.01vol.% was prepared. The critical heat flux enhancement was 52, 67 and 87%, and the boiling heat transfer coefficients enhancement was 114, 142, 74%, respectively. For investigation roughness of surface, deionized water was boiled for several times in surface that coated with nanofluid in two regions of boiling, nuclear boiling region and Critical heat flux region and was observed that the roughness of surface was constant in consecutive boiling. Boiling of deionized water on coated surface in two regions was indicated that critical heat flux and boiling heat transfer coefficients was enhanced.