Nanofluids have created considerable interest in recent times for their improved heat transfer capabilities. With very small volume fraction of such particles the thermal conductivity and convective heat transfer capability of these suspensions are significantly enhanced. Therefore, in this present study one of convection processes associated with the change in phase of a nanofluid which can occur at a solid–liquid interface isinvestigated. For this purpose boiling heat transfer characteristics of nanofluids with ano particles suspended in water are studied using different volume concentrations of nano particles in a horizontal simple flat and three grooved plates made from copper at ambient pressure. The experiments are performed to explore the effects of grooving heating surface on boiling heat transfer characteristics of nanofluids. Two different concentrations of 0.2% and 0.4% by volume of TiO 2 dispersed with water are prepared and the experiments are performed in simple flat, quadrangular grooved, circular grooved and triangulate grooved heating surfaces. Logarithmic diagram of heat flux passing through heating surface and boiling heat transfer coefficient are drawn in terms of superheat degree and heat flux, respectively. Also boiling heat transfer coefficients of anofluid are compared with those of ure water in each of heating urfaces. It has been observed that these nanofluids have poor heat transfer performance compared to pure water in each of heating surfaces. With increase in volume concentration of nano particles, the heat transfer coefficient decreases and while grooving heat transfer surface enhances heat transfer coefficient of fluid. The test results exhibit in each heat flux, the triangulate grooved heating surface has the maximum heat transfer coefficient and heat transfer coefficient i circular grooved heating surface is larger than the heat transfer coefficient in quadrangular grooved heating surface for pure water and nanofluid in each volume concentration. Keywords : Nanofluids, Pool Boiling, Grooved heating surface, Contact are
