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http://dx.doi.org/10.3795/KSME-B.2014.38.7.607

Experimental Investigation of Heat Transfer During Vertical Upward Flow of Supercritical CO2 in Circular Tube  

Kim, Dong Eok (Dept. of Precision Mechanical Engineering, Kyungpook Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.7, 2014 , pp. 607-618 More about this Journal
Abstract
An experimental investigation of turbulent heat transfer during the vertical upward flow of supercritical $CO_2$ was conducted in a circular tube with inner diameter of 4.5 mm. The experiments were conducted at bulk fluid temperatures ranging from 29 to $115^{\circ}C$, pressures from 74.6 to 102.6 bar, local wall heat fluxes from 38 to $234kW/m^2$, and mass fluxes from 208 to $874kg/m^2s$. At moderate wall heat and low mass fluxes, the wall temperature had a noticeable peak value. For observing the buoyancy and flow acceleration effects on heat transfer, the ratios of Nusselt numbers from the experimental data and a reference correlation were compared with the $Bo^*$ and $q^+$ distributions. The flow acceleration parameter $q^+$ appropriately represented the heat transfer phenomena in the experiments. A new heat transfer correlation for the vertical upward flow of the supercritical pressure fluid was developed, and was found to agree with the experimental data with an error margin of ${\pm}30%$.
Keywords
Supercritical $CO_2$; Local Heat Transfer; Buoyancy; Flow Acceleration; Correlation;
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