Effect of nanoparticle deposition rate on critical heat flux in pool boiling

Critical Heat Flux (CHF) is experimentally investigated for water and TiO2 nanofluids in pool boiling. Experiments were carried out with Ni-Cr heating wire of 0.28 mm diameter. The nanoparticle deposition in the constant heat flux heater wire is characterized by varying the nanofluid volume concentrations (0.01 and 0.05 %) and boiling time (1 to 16 minutes). Results indicated that CHF was enhanced with increased particle deposition on heater wire compared to the bare wire. The CHF got enhanced up to 93% when the particle deposition occurred for 16 minutes. Wettability measurements indicated that the contact angle decreases with the increase in the deposition rate.