Experimental and Numerical Investigation of Convection Heat Transfer in A Circular Copper Tube Using Graphene Oxide Nanofluid


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KARABULUT K. , BUYRUK E. , KILINÇ F.

Journal Of The Brazilian Society Of Mechanical Sciences And Engineering, cilt.42, no.230, 2020 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 42 Konu: 5
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s40430-020-02319-0
  • Dergi Adı: Journal Of The Brazilian Society Of Mechanical Sciences And Engineering

Özet

To able to employ nanofluids in engineering applications, it is essential to investigate heat transfer properties in addition

to thermophysical characteristics. In this work, the convection heat transfer coefficient of graphene oxide-distilled water

nanofluid along a circular copper tube having a constant heat flux at the outside surface has been investigated both numerically

and experimentally under turbulent flow regime. While the nanofluid convection heat transfer and head loss of pressure

have been evaluated in the experimental section, the tube wall surface temperature, the convection heat transfer coefficient

and friction factor have been obtained by using finite volume method in the numerical part with a three-dimensional domain

by assuming single-phase flow. Surface and fluid temperatures and pressure drop of the distilled water have been acquired

and compared with the related output from the correlation. Besides, the variations of the tube surface temperatures and the

convection heat transfer coefficients of the nanofluids have been examined as numerical and experimental comparisons. The

contours of the temperatures, convection heat transfer coefficients and pressure distributions for fluids have been presented.

The convection heat transfer performances of the nanofluids according to the different volumetric flow rates, concentrations

and the heat flux values have been exhibited in this study. The heat transfer coefficient increment value for the nanofluid of

0.02 vol% concentration and with a flow rate of 1.5 l/min (Re = 5032) has been obtained as about 48% for 5073.244 W/m2

(350 W) heat flux according to the distilled water.