Enhanced heat transfer performance of an automobile radiator with graphene based suspensions. (August 2017)

• Record Type: Journal Article
• Authors: Selvam, C.; Mohan Lal, D.; Harish, Sivasankaran
• Is Part Of: Applied thermal engineering. Volume 123(2017)
• Page Start: 50
• Page End: 60
• Publication Date: 2017-08
• Subjects: Graphene -- Nanofluids -- Automobile radiator -- Convective heat transfer -- Pressure drop -- Thermal conductivity; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2017.05.076
• Languages: English
• ISSNs: 1359-4311

Abstract

Graphical abstract: Highlights: Graphene nanoplatelets/H2 O-EG nanofluids prepared by non-covalent method. Heat transfer coefficient and pressure drop in car radiator is investigated. Effect of nanofluids mass flow rate and inlet temperature is investigated. Heat transfer coefficient is enhanced by mass flow rate and temperature. The increase in pressure drop is limited beyond 0.2 vol% of GnP loading. Abstract: We report the convective heat transfer coefficient and pressure drop of graphene nanoplatelets seeded in water-ethylene glycol mixture flowing through an automobile radiator. The volume concentrations of graphene nanoplatelets were varied from 0.1% to 0.5%. Thermophysical properties such as thermal conductivity, viscosity, density and specific heat capacity of nanofluids were measured experimentally. Mass flow rate of nanofluids were varied from 10 g/s to 100 g/s. Nanofluid inlet temperature was considered as 35 °C and 45 °C while the ambient air velocity was fixed as 3 m/s for the convective heat transfer experiments. The convective heat transfer coefficient of nanofluids increases with increasing loading of graphene nanoplatelets, nanofluid inlet temperature and mass flow rate. The enhancement of convective heat transfer coefficient for the highest concentration (0.5 vol%) and highest mass flow rate (100 g/s) was found to be 20% and 51% when the nanofluid inlet temperature was 35 °C and 45 °C respectively. The pressure drop of nanofluid increases with respect to graphene nanoplatelets loading and mass flow rate. As the loading of nanoplatelets increases from 0 to 0.5 vol% the pressure drop increases from 3.07 to 4.88 kPa at 35 °C while it increases from 3.02 to 4.04 kPa at 45 °C for 100 g/s. The present nanofluid has a potential to replace the conventional heat transfer fluids leading to compact thermal systems.