Özet:

In this study, fully developed turbulent flow and heat transfer behavior of water, ethylene glycol, mercury and propane based nanofluids in a corrugated trapezoidal plate heat exchanger have been numerically investigated. A constant heat flux was applied to the heat exchanger and the constant heat flux was chosen to be 6 kW / m2, volume fractions ϕ=0%-4%, diameter d = 20 nm and Al2O3 was selected as nanoparticle.The Reynolds number varies from 6000 to 20000. Geometric parameters of the corrugated trapezoidal channel, trapezoidal height e=5mm, trapezoidal pitch Pe=12mm, width of the top trapezoidal channel w=3mm. Executive equations have been solved with Ansys Fluent  programme. The velocity distribution,temperature contours,pressure drop, average Nu number and thermal-hydraulic performance have been analyzed and presented. The effects of nanofluids have been examined on heat and flow fields and it has been observed that the heat transfer increases together with the nanoparticle volume concentration. When the nanofluid is used in a forced convection, the amount of heat transfer increases as the Prandtl number increases. The highest value of the average Nusselt number was obtained in the ethylene glycol-based nanofluid, and the lowest value was obtained in the mercury-based nano-fluid.Results show that the use of nanofluid in the corrugated trapezoidal channel increases the thermal performance of systems and thus contributes to the design of more compact heat exchanger.

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