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Approach Temperature of Heating Process in Double Tube Heat Exchanger with Al2O3-Water Nanofluid

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The approach temperature of heating process in double tube heat exchanger with Al2O3-water nanofluid under turbulent flow regime have been studied. This investigation were made on the effect of 0.1% volume concentration of nanoparticles on the approach temperature decreases. In this study, the tube outside diameter is 20 mm which is made of aluminium and the shell inside diameter is 28 mm which is made of acrylic. The parallel flow used as flow pattern and Reynold Number (Re) in the annulus room were varied from 31981 to 43601 and in tube side were maintain constant at 30904. The temperature of Al2O3-water nanofluid (hot stream) on inlet terminals are remain constant at 45±0.2 °C. Meanwhile the temperature of water cold stream 30±0.5 °C. Temperature measurement conducted on each terminal of inlet and outlet heat exchanger. The experiment shows that nanoparticles induced the approach temperature. The change of approach temperature on various Re number from the Al2O3-water nanofluid compared to that of without Al2O3-water nanofluid decreased by 2.78% to 5.71%. This phenomenon indicates an increases of heat transfer process inside heat exchanger. The application of nanofluid particles enhanced the convective heat transfer passively.

Keywords: Alumina; Annulus; Heat Exchanger; Nanofluid

Document Type: Research Article

Affiliations: Mechanical Engineering Department, Politeknik Negeri Bali, Jalan Kampus Bukit Jimbaran, Kuta Selatan, Badung 80364, Bali, Indonesia

Publication date: December 1, 2017

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