International Scientific Journal

Thermal Science - Online First

online first only

TLBO algorithm-based optimal heat transfer parameters prediction of Al2O3 water nanofluids in variable pitch corrugated tube heat exchanger

This study investigated an aluminium oxide nanofluid water-based tube heat exchanger fitted with a corrugated copper tube under laminar flow conditions. This study is carried out to observe the heat transfer rate within the heat exchanger. The effect of nanoparticle concentrations, the flow rate of the working fluid, and the corrugated tube pitch on the heat exchanger efficiency were analysed. The results show that when Al2O3 water nanofluids are sandwiched between corrugated copper tubes, the heat transfer rate is significantly enhanced compared to the smooth tubes. Nanofluids of aluminium oxide were prepared with concentrations of 0.25, 0.5%, and 1% in deionised water. Corrugated tubes with 25 mm, 20 mm, and 18 mm pitches were fabricated for this investigation. The deionised water and aluminium oxide nanofluid flow rates were maintained at 0.1m3/h, 0.15m3/h and 0.2m3/h, respectively. Results showed that aluminium oxide nanofluids improved the heat transfer rate related to water-based fluids. The highest heat transfer occurred in the 18-mm pitch corrugated copper tube in which 1% nanofluid volume concentration was used as the heat transfer medium. It is observed that the heat exchanger containing corrugated copper tubes with pitch 17.88 mm having 0.98 vol. % of Al2O3 nanofluids, flowing at 0.198 m3/h, enhances the heat transfer rate between the working fluids.
PAPER REVISED: 2023-08-07
PAPER ACCEPTED: 2023-10-02
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