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Heat Transfer and hydraulic characteristics of Supercritical CO2 in cooled and heated horizontal semicircular channels
Author(s): Yi Tu, Yu Zeng
Keywords: microchannel, supercritical CO2, heat transfer, semicircular channel, computational fluid dynamics
Heat transfer characteristics of supercritical CO2 in horizontal semicircular channels were numerically investigated using Computational Fluid Dynamics method validated with experimental data. Comparison study was conducted of semicircular and circular channels with the same hydraulic diameter and boundary condition at bulk temperature range including pseudo-critical point. The results show that the heat transfer coefficients of the semicircular channel are significantly smaller than that of the circular channel for heating process, while for cooling process, the channel shape influence is not obvious. The numerical results are compared with various existing prediction correlations, and a modified model was proposed based on Olson correlation of semicircular channel considering channel geometry and fluid viscosity influence. Further study was conducted to discuss the effect of hydraulic diameter and boundary condition on heat transfer of semicircular channel, and indicate that the modified correlation provides reasonable prediction of the heat transfer coefficients in heated semicircular channel.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.