Heat Transfer Enhancement Using Graphene Oxide/Water Nanofluid in a Two-Phase Closed Thermosyphon

Abstract

: A two-phase closed thermosyphon (TPCT) is a device for heat transmission. The TPCT is composed of three major parts: Lower evaporator, the adiabatic region in the central range and the condenser at the top. Fluids with nanoparticles (particles smaller than 100 nm) suspended in them are called nanofluids that they have a great potential in heat transfer enhancement. In the present study, Nanofluids of aqueous Graphene oxide (GO) nanoparticles suspensions are prepared in various volume concentration of 0.05–0.20% and used in a TPCT as working media. Experimental results showed that for different input powers, the heat transfer coefficient of the TPCT increases up to 33.04% when GO/water nanofluid is used instead of pure water. A decrease of 24.83% is achived in thermal resistance at 0.20 vol.% for GO/water nanofluid.