Heat transfer to nanofluids flow in variable circular and annular passage configuration / Arrul Jagindar

Arrul, Jagindar (2021) Heat transfer to nanofluids flow in variable circular and annular passage configuration / Arrul Jagindar. Masters thesis, Universiti Malaya.

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Abstract

The invention of the heat exchanger is widely regarded as one of the most significant inventions of all time. Heat exchangers are critical pieces of equipment used in a variety of industrial settings, including power plants, the HVAC sector, and the chemical industry. In heat exchangers, numerous fluids are employed as working fluids. Water, oil, and ethylene glycol are three of the most often utilized working fluids.A minor alteration in the operating principle of a heat exchanger can produce a significantly larger result at a lower cost. This concept has always piqued the interest of scholars. As a result, researchers have done several studies to improve the heat exchanger, whether from a material or heat transfer standpoint. In terms of heat transfer, they discovered that traditional working fluids have limited thermal conductivity and characteristics. There have been attempts to make a combination of solid particles suspended in water. This invention suffered a setback when the pressure drop was impaired, sedimentation developed, or even erosion happened, resulting in higher maintenance costs. Gago and TioSio nanofluids were synthesized in this study investigated their performance in heat exchanger applications. Thermophysical characteristics, thermal conductivity, specific heat capacity were measured.The heat transfer coefficients were investigated at fully developed turbulent flow regime in an annular tube heat exchanger . The experimental data of all the synthesized nanofluids showed a considerable increase in thermal conductivity and heat transfer coefficient when compared with the results obtained from the base fluid. Based on the experimental results, several improved empirical correlations for calculating the Nusselt number and friction factor were proposed in this study.

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