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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Numerical and Experimental Study on Heat Transfer of Supercritical CO2 in Micro Serpentine Tubes




Abstract

In supercritical CO2 enhanced geothermal systems, there are not only straight channels but also wavy channels. While the heat transfer and flow of supercritical CO2 in wavy channels, especially serpentine channels were not fully studied compared to straight channels. This paper carried out numerical and experimental study for supercritical CO2 flow and heat transfer in micro serpentine tubes. Experimental results were given for the serpentine tube whose bending diameter is 8 mm and the inner diameter is 0.953 mm. The pressure was at supercritical 7.6 MPa, 9.5MPa, The heat flux ranged from 1.6 to 14.0 kW/m2 and the inlet mass flow rate included laminar and turbulent conditions (Re = 3500-5500). Different cases are simulated based on the experimental results to obtain three dimensional temperature and velocity distribution. Various bending diameter of 2mm, 4mm, 8mm, at various mass flow inlets, heat fluxes and supercritical pressures are simulated. More details and characteristic information were given for the simulation results to better analyze the heat transfer mechanism of supercritical CO2 in serpentine tubes. The results showed that the heat transfer deterioration happening in straight tubes was improved in serpentine tubes. The influences of centrifugal forces, buoyancy forces and variable fluid properties were discussed along the flow direction, which is beneficial to explain the heat transfer enhancement or deterioration.

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