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Effect of using graphene/water based nanofluid on heat transfer in heat exchangers with rotating straight inner tube

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Published/Copyright: March 2, 2021
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Abstract

In this research, the effect of nanofluids including graphite and water on the heat transfer enhancement in heat Exchangers with both straight and rotational inner tube were examined. Nano-fluids including graphite and water were obtained at 0.01, 0.02 and 0.03 %volume concentrations by means of pure water as a base fluid. The aim of the study is to experimentally investigate and compare the influence of straight inner tube on the performance of a double tube heat exchanger at different flow rates, different capacity ratios (0.25, 0.5, 0.75, 1), different rotation rates (0 RPM, 100 RPM, 150 RPM, 200 RPM, 300 RPM, 500 RPM and 750 RPM) and by using nanofluid including graphite and water volume at values of 0.01, 0.02, 0.03%. In the experiments the flow is turbulent. In order to determine the heat transfer enhancement, the experimental datas were compared for pure water and nano-fluids. According to the results, Nusselt number, pressure loss, efficiency of heat exchanger were gauge. By the results achieved from experiments, correlations for Nusselt number have been reproduce and experimental data have been compared with ones in the literature by drawing graphics. The experiment that provides the best increase in heat transfer is the nanofluid including 0.02% volume concentrations of graphene/water at 500RPM speed.

Kurzfassung

In dieser Untersuchung wurde der Effekt von Nanofluiden einschließlich Graphit und Wasser auf die Verbesserung der Wärmeübertragung in Wärmetauschern mit geradem und rotierendem Innenrohr untersucht. Nano-Fluide, die Graphit und Wasser enthalten, wurden in Konzentrationen von 0.01, 0.02 und 0.03 Vol.-% mit reinem Wasser als Basisflüssigkeit hergestellt. Ziel der Studie ist die experimentelle Untersuchung und der Vergleich des Einflusses des geraden Innenrohrs auf die Leistung eines Doppelrohr-Wärmetauschers bei verschiedenen Durchflussraten, verschiedenen Kapazitätsverhältnissen (0,25, 0,5, 0,75, 1), verschiedenen Rotationsgeschwindigkeiten (0 U/min, 100 U/min, 150 U/min, 200 U/min, 300 U/min, 500 U/min und 750 U/min) und unter Verwendung von Nanofluid einschließlich Graphit und Wasser bei Volumen-konzentrationen von 0.01, 0.02 und 0.03%. Bei den Experimenten ist die Strömung turbulent. Um die Verbesserung des Wärmeübergangs zu bestimmen, wurden die experimentellen Daten für reines Wasser und Nano-Fluide verglichen. Anhand der Ergebnisse wurden die Nusselt-Zahl, der Druckverlust und die Effizienz des Wärmetauschers gemessen. Anhand der Ergebnisse aus den Experimenten wurden Korrelationen für die Nusselt-Zahl abgeleitet und die experimentellen Daten mit in der Literatur enthaltenen Daten graphisch verglichen. Das Experiment, das die beste Steigerung der Wärmeübertragung liefert, ist das Nanofluid mit 0.02% Volumenkonzentration von Graphen/ Wasser bei 500 RPM.

Nomenclature

C

The ratio of the flow rate of hot fluid to the flow rate of cold fluid

Cp

Specific heat, J/(kg K)

k

Thermal conductivity, W/(m K)

n

The rotation rate/RPM

Nu

Nusselt number

ΔP

Pressure drop/kPa

Pr

Prandtl number

Q

Heat transfer rate/W

Qc

Heat transfer rate (cold fluid), W

Qh

Heat transfer rate (hot fluid), W

Re

Reynolds number

T

Temperature, K

T

Temperature/K

ΔT

Temperature difference/K

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Received: 2020-06-09
Published Online: 2021-03-02

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