Supercritical “boiling” number, a new parameter to distinguish two regimes of carbon dioxide heat transfer in tubes

By Bingguo Zhu, Jinliang Xu, Xinming Wu, Jian Xie, Mingjia Li. International journal of thermal sciences, 2019

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Abstract The objective of this paper is to develop a criterion to predict the onset of heat transfer deterioration (HTD) for supercritical CO2 heat transfer. A new mechanism is proposed by assuming supercritical pseudo-boiling. Before bulk fluid reaches pseudo-critical temperature (Tpc), the tube cross-section contains a vapor layer and a liquid-like fluid. The saturation temperature interface is defined at T = Tpc, inside and outside which are a vapor layer (T > Tpc) and a subcooled liquid (T  5.126 × 10 − 4 and the critical heat flux is expressed as q C H F = 5.126 × 10 − 4 G i pc . It is shown that our new criterion is also suitable for other experiments reported in literature, providing a general guidance to design and operate S CO2 heaters to avoid HTD.

Subfields: Biomedical Engineering, Computational Mechanics

View Paper: https://www.semanticscholar.org/paper/794eaf1e748abc9a85df79b320ad2c3ff233f1e5