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Title: Experimental Study on Heat Transfer and Pressure Drop of In-House Synthesized Graphene Oxide Nanofluids

Journal Article · · Heat Transfer Engineering
 [1];  [2];  [2]; ORCiD logo [3];  [2]
  1. Univ. of Alabama, Tuscaloosa, AL (United States). Department of Chemical and Biological Engineering
  2. Tennessee Technological Univ., Cookeville, TN (United States). Department of Mechanical Engineering
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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In this work, first, graphene oxide nanosheets were synthesized in-house according to the modified Hummers method, and these nanosheets were used to prepare graphene oxide nanofluids at two concentrations. Then the thermo-physical properties of nanofluids characterized using X-ray diffraction analysis, a scanning electron microscope, and UV-Vis spectrophotometry. The particle size distribution was investigated using dynamic light scattering. Then, a fundamental study was conducted on the thermal-hydraulic characteristics of graphene oxide nanofluids flowing through a straight copper tube. An experimental setup was developed to find the heat transfer characteristics and pressure drop of nanofluids in the test section consisting of a copper tube with constant heat flux. The flow regimes and associated pressure drop and heat transfer characteristics at varying flow rate were investigated at three different heat flux conditions of 7.4, 9.1, and 12.6 kW/m2. Due to the increase in viscosity, flowrate and Reynolds number decreased from 0.01 wt.% to 0.1 wt.% of graphene oxide nanofluids at constant pump frequency. Experimental data obtained for water was validated with the findings from the literature, and the correlations were formulated for the Nusselt number and Reynolds number by considering the multiple regression analysis. The convective heat transfer coefficient for graphene oxide at 0.01 wt.% was higher when compared to graphene oxide at 0.1 wt.% and water. Finally, the variation of Nusselt number with the heat flux and velocity was insignificant.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1471841
Journal Information:
Heat Transfer Engineering, Vol. 40, Issue 20; ISSN 0145-7632
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (1)

Thermo-hydraulic and entropy generation analysis of recharging microchannel using water-based graphene–silver hybrid nanofluid journal February 2020

Figures / Tables (11)

Fig. 1(p. 3)figure Fig. 1
Table 1(p. 6)table Table 1
Table 1: Con't(p. 7)table Table 1: Con't
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Table 2(p. 12)table Table 2
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Fig. 6(p. 20)figure Fig. 6
Fig. 7(p. 21)figure Fig. 7

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42 ENGINEERING
36 MATERIALS SCIENCE
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