Abstract
Coolant plays important characteristic in automobile industry to prevent failure and damage by balancing the temperature. Due to this approach, coolants are being used as new thermal fluid to study the heat transfer coefficient performance. This study consists of an experimental investigation of internal convective heat transfer of 50:50 Water-Ethylene Glycol based Nano-fluid through a copper tube of 18mm external diameter and 16.5mm internal diameter and a test section of 1m in a fully turbulent regime. Total convective heat transfer coefficient of Nano fluid at three different volumetric concentrations of nanoparticles is estimated. Local convective heat transfer at eight different points along the tube at varying Reynolds number is also determined. At 0.15% volumetric concentration of SiO2 Nanoparticles (NPS) 29% increment in convective heat transfer coefficient (CHT) is observed. The decrease in the heat transfer rate is observed with changing distance axially. Particles disorganized movement of NPs and undulation in the fluid and increased in thermal conductivity of Nano fluid can be possible reason for extra ordinary change in heat transfer.
Highlights
Liquid stream and heat transfer (HT) in a channel has been a famous region of specialists because of its generally application, for example, electronic devices and heat exchangers (HX) [1,2]
Vermahmoudi et al [3] find out the general heat transfer coefficient (HTC) and heat transfer (HT) of water based Fe2O3 (0.15, 0.14 and 0.65% vol.) NFs in a smaller air cooled HX under laminar stream conditions
Greatest improvements of the general HTC and HT rate contrasted with base fluid were separately equivalent to 13% and 11.5% at 0.65% vol Fe2O3-water Nanofluid was used by Ravi Kumar et al [10] to find out the Nusselt number (Nu) at different volume concentrations 0.005%, 0.01%, 0.03% and 0.06% of the NPs with Reynolds number range from 15,000 to 30,000
Summary
Liquid stream and heat transfer (HT) in a channel has been a famous region of specialists because of its generally application, for example, electronic devices and heat exchangers (HX) [1,2]. Greatest improvements of the general HTC and HT rate contrasted with base fluid were separately equivalent to 13% and 11.5% at 0.65% vol Fe2O3-water Nanofluid was used by Ravi Kumar et al [10] to find out the Nusselt number (Nu) at different volume concentrations 0.005%, 0.01%, 0.03% and 0.06% of the NPs with Reynolds number range from 15,000 to 30,000. Sir Ali et al [17] used ZnO NPs in different concentrations of 0.01%, 0.08%, 0.2% and 0.3% Vol in water as base fluid to find out the enhancement of HT of car radiator. Sohaib Usman et al [24] examined the convective HT of alumina-water Nanofluid using 0.3,0.5 and 1% volume concentration at Re between 200-7000 They did all this in rectangular channel consistently heated in laminar, turbulent and transition flow streams. Experimental information, acquired for turbulent flow system, has plainly demonstrated that the incorporation of NPs into refined water has created an impressive improvement of the cooling square convective HTC
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