Abstract
A study of computational fluid dynamics has been conducted to study the characteristics of the heat transfer and friction factor of Al2O3/Ethylene glycol-water nanofluid flowing in straight channel. The three dimensional realizable k-e turbulent model with enhanced wall treatment was utilized. As well as were used Temperature dependent thermophysical properties of nanofluid and water. The evaluation of the overall performance of the tested channel was predicated on the thermohydrodynamic performance index. The obtained results showed that the difference in behaviour depending on the parameter that has been selected to compare the nanofluid with the base fluid. In addition, the friction factor and the heat transfer coefficient increases with an increase of the nanoparticles volume concentration at the same Reynolds number. The penalty of pressure drop is negligible with an increase of the volume concentration of nanoparticles. Conventional correlations that have been used in turbulent flow regime to predict average heat transfer and friction factor are Dittus-Boelter and Blasius correlations, for channel are also valid for the tested nanofluids which consider that the nanofluids have a homogeneous fluid behave.
Highlights
Using heat transfer enhancement techniques, can improve thermal performance of a tubes [13]
The effects of nanoparticle volume concentration (1-10% Al2O3) in base fluid of ethylene glycol-water mixture was studied in both numerically and experimentally, where the results showed that with an increase of particle concentration at constant Reynolds number the enhance of heat transfer rate increased considerably [16]
The metal particles are produced in form of nano-powder, and the nano particles dispersed in the base fluid
Summary
Using heat transfer enhancement techniques, can improve thermal performance of a tubes [13]. The results shown due to the nanoparticle presence in the fluid the heat transfer has been enhanced. Horizontal doubletube heat exchanger counter turbulent flow studied numerically by [13, 14]. The results showed that significant of the nanofluid in heat transfer enhancement and good agreement with other experimental data. The turbulent flow of nanofluids (TiO2, Al2O3 and CuO) with different volume concentrations flowing through a duct under constant heat flux condition with two-dimensional model has been analysed numerically [15]. The effects of nanoparticle volume concentration (1-10% Al2O3) in base fluid of ethylene glycol-water mixture was studied in both numerically and experimentally, where the results showed that with an increase of particle concentration at constant Reynolds number the enhance of heat transfer rate increased considerably [16]. Results were validated by comparison with experimental data in the literatures.\
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