The Experimental Investigation and Comparison of Thermal Conductivities of Cobalt and Silica Nano fluids in Glycerol Water Mixture as Base fluid
T. Rajendra Prasad1, K. Rama Krishna2, K. V. Sharma3

1T. Rajendra Prrasad, Resarch Scholar, Center for Energy Studies, JNTUH College of Engineering, Hyderabad (Telangana), India.
2K. Rama Krishna, Department of Mechanical Engineering, KLEF, Vaddeswaram (Andhra Pradesh), India.
3K. V. Sharma, Center for Energy Studies, JNTUH College of Engineering, Hyderabad (Telangana
), India.

Manuscript received on 01 May 2019 | Revised Manuscript received on 15 May 2019 | Manuscript published on 30 May 2019 | PP: 1614-1621 | Volume-8 Issue-7, May 2019 | Retrieval Number: G6122058719/19©BEIESP
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Abstract: The present work is intended to bring out the comparison between the enhancements of thermal conductivities of cobalt and silica nanofluids. A nanofluid is a dispersion of solid nano-sized particles in a carrier liquid called basefluid. The experimental study has been done on thermal conductivities of Cobalt (Co) and Silica (SiO2) nanofluids in Glycerol-Water (GW) mixture as basefluid. The average particle size of Cobalt nanoparticles was 80nm and that of SiO2is 50nm. The initiation of the work started with the optimal mixture ratio selection of GW solutions. The selected optimal ratio of GW solution is used as basefluid for Co and SiO2nanofluids preparation. Both nanofluids are prepared at concentrations of 0.5, 1 and 2% of nanoparticles by weight. The zeta potential test is conducted for the prepared nanofluids to ensure stability. The thermal conductivities of Co and SiO2 nanofluids increased with nanoparticle concentration and temperature. The thermal conductivity enhancement of Co nanofluids is greater than that of SiO2nanofluids at any given concentration and temperature.
Keyword: Nanofluid, GW mixture, Zeta potential, Thermal conductivity.
Scope of the Article: Thermal Engineering.