Effect of Temperature and Nanoparticle Concentration on the Viscosity of Glycerine-water based SiO2 Nanofluids
M. L.R. Chaitanya Lahari1, P. Haseena Bee2, P.H.V. Sesha Talpa Sai3, K.S. Narayanaswamy4, S. Devaraj5, K.V. Sharma6
1M.L.R. Chaitanya Lahari, Research Scholar, School of Mechanical Engineering, Reva University, Bangalore, India.
2P. Haseena Bee, Research Scholar, School of Mechanical Engineering, Reva University, Bangalore, India.
3P.H.V. Sesha Talpa Sai*, Professor & Director-R&D, Department of Mechanical Engineering, Malla Reddy College of Engineering and Technology, Hyderabad, India.
4K.S. Narayanaswamy, Professor & Director, School of Mechanical Engineering, Reva University, Bangalore, India.
5S. Devaraj, Professor, School of Mechanical Engineering, Reva University, Bangalore, India.
6K.V. Sharma, Emeritus Professor, Centre for Energy Studies, Jawaharlal Nehru Technological University, Hyderabad.

Manuscript received on October 04, 2021. | Revised Manuscript received on October 18, 2021. | Manuscript published on November 30, 2021. | PP: 111-116 | Volume-10 Issue-4, November 2021. | Retrieval Number: 100.1/ijrte.C64180910321| DOI: 10.35940/ijrte.C6418.0910321
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Abstract: Dynamic viscosity of SiO2/22nm nanofluids prepared in a glycerine-water (30:70 by volume) mixture base liquid, referred to as GW70, is measured experimentally. Nanofluids with concentrations of 0.2, 0.6, and 1.0 percent are produced, and viscosity measurements are carried out at temperatures ranging from 20 to 80 oC using a LVDV-2T model Brookfield Viscometer. The particle size and elemental composition of nanoparticles are determined using FESEM and EDX. XRD images confirm the SiO2 peaks in the crystalline structure. The rheology of nanofluids is influenced by the nanoparticle’s concentration. In the experimental temperature and concentration range, nanofluids show Newtonian behavior. The viscosity of nanofluids enhanced as particle concentration increased and reduced as temperature increased. For 1.0 percent vol. concentration at 20oC, the maximum viscosity value is achieved, and for 0.2 percent vol. concentration at 80oC, the lowest viscosity value is observed. The viscosity of the glycerine-water base fluid was also determined at 20, 40, 60, and 80 degrees Celsius. The viscosity ratio of nanofluids to the base liquid is found to be more than one for all the nanofluids. This viscosity data is useful to estimate HTC of glycerine-water-based silica nanofluids. 
Keywords: Nanofluids, glycerine-water base liquid, SiO2, viscosity, FESEM.