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.
Highlights
Nanofluids are used for improved heat transmission and cooling processes in many industries
Prasher et al [19] utilized thermal and hydraulic research and showed that if the increase in VST of nanofluids is 4 times higher than the relative rise in TC of NF over the base liquid, the NF can be useful in heat transfer enhancement
Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This implies that if a nanofluid's TC increases by 25% at a particular ’φ’ value of nanoparticles, the rise in VST of that nanofluid at that same ‘φ’ must be within 100% of the base fluids to surpass it in heat transfer
Summary
Nanofluids are used for improved heat transmission and cooling processes in many industries. Prasher et al [19] utilized thermal and hydraulic research and showed that if the increase in VST of nanofluids is 4 times higher than the relative rise in TC of NF over the base liquid, the NF can be useful in heat transfer enhancement. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP) This implies that if a nanofluid's TC increases by 25% at a particular ’φ’ value of nanoparticles, the rise in VST of that nanofluid at that same ‘φ’ must be within 100% of the base fluids to surpass it in heat transfer. The mixing of NP’s increases the viscous nature of the base liquid, the enhanced thermal and physical properties of the NF’s will compensate for this shortcoming This makes the use of nanofluids an emerging candidate for cooling and HT applications
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