Experimental study of heat transfer characteristics of nanofluids nucleate and film boiling on horizontal flat plate

Abstract

In this paper, the heat transfer characteristics of nanofluids nucleate and film boiling is studied experimentally. For this purpose, Al2O3 and SiO2 deionized water-based nanofluids prepared with three volumetric concentrations of 0.1%, 0.3% and 0.5%. The boiling experiments were conducted on a circular and polished copper surface with a diameter of 25 mm. The results showed that the addition of nanoparticles to the base fluid reduced the heat transfer coefficient of nucleate boiling. The boiling of nanofluids increased the surface wettability and the critical heat flux was significantly higher than that of pure deionized water. The Al2O3 deionized water-based nanofluid with a volumetric concentration of 0.5% had the best performance, with a critical heat flux of 44.56% higher than that of pure deionized water. The presence of nanoparticles in the deionized water-based nanofluid improved the heat transfer coefficient of film boiling. The results showed that the stable film boiling for nanofluids starts at higher wall superheat temperature difference than pure deionized water. Among the investigated concentrations, volumetric concentration of 0.5% had best performance for both nanofluids, so that the minimum heat flux of Al2O3 and SiO2 deionized water-based nanofluids were increased 35.01% and 34.40% compared to pure deionized water, respectively.

Numerical simulation of laminar flow and free convection heat transfer from an isothermal vertical flat plate

“…Saeidinezhada et al [4] analyzed both, pressure distributions on the surface and the boundary layer. Golkar et al [5] have experimentally studied on a horizontal flat plate, a heat transfer from a nanofluid.In the work done by Shakiba and Rahimi [6], the Boussinesq approximation was used to numerically analyze an unsteady flow problem in mixed convection. Lakshmi Devi et al [7] used similarity transformations to analyze nanofluid flow while visualizing the effects of buoyancy force.A numerical analysis was conducted by Mokaddes Ali et al [8] in order to study a mixed convective flow.Other numerical investigations were carried out in this field on fluid flows [9,10].…”