Abstract
The flow and heat transfer characteristics of supercritical CO2 heated in helical coiled channel under one-side condition are conducted in this work. The numerical results are compared with the experimental data under different conditions and results show good consistency.The effects of pressure, mass flux, heat flux, gravity level, flow direction, buoyant force, and flow thermal acceleration on temperature and heat transfer coefficient are analyzed. Results show that appropriate matching of the heat flux and mass flux generates high heat transfer coefficient with CO2 fluid staying near pseudo-critical state until the outlet of the channel. Semicircular heating mode reinforces the centrifugal effect and creates crescent-shaped flow pattern with large velocity gradient. The flow instability in both radial and longitude direction induced by the large velocity gradient is quantified by the turbulent kinetic energy and contributes to the heat transfer enhancement.
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