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NUMERICAL INVESTIGATION OF TRIPLE CONCENTRIC−TUBE HEAT EXCHANGER USING Al2O3-WATER NANOFLUIDS

Tarikayehu Amanuel
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, India

Manish Mishra
Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand-247667, India

DOI: 10.1615/IHMTC-2017.470
pages 345-350

Abstract

The heat transfer and pressure drop characteristics of Al2O3−water nanofluid flowing in a triple concentrictube heat exchanger under laminar-turbulent(low Re) flow conditions are investigated. CFD has been employed for simulating the flow behavior. Reynolds number for the hot nanofluid was considered in the range of 990-4480 with a nanoparticle volume concentration of 0-2%. The effects of nanoparticle volume concentration, flow rate and flow arrangement on heat transfer and pressure drop of hot nanofluid has been studied. Nusselt number, friction factor and thermal performance factor have been obtained to interpret the results of the study. It was observed that the addition of nanoparticles (in the range mentioned) resulted in significant enhancement in heat transfer while incurring a slight pressure drop, compared to base fluid. In addition, the increase in flow rate (Reynolds number) also caused a greater heat transfer while reducing friction factor. With regard to the flow arrangement, counter flow always provided a better result than parallel flow.

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