Study on Convective Heat Transfer of Supercritical Water in Annular Square Channel

Supercritical water, known for its abrupt changes in fluid properties near the pseudocritical region, has always posed a design challenge, leading to enhancement or deterioration in heat transfer. Additionally, the lack of complete understanding of the thermodynamic behavior of supercritical water n...

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Bibliographic Details
Published in:	Heat transfer engineering Vol. 44; no. 20; pp. 1847 - 1863
Main Authors:	Murugan, Thamilmani, Raj, Arun K., Agrawal, Amit, Saha, Sandip K.
Format:	Journal Article
Language:	English
Published:	Philadelphia Taylor & Francis 13-11-2023 Taylor & Francis Ltd
Subjects:	Compressibility Convective heat transfer Flow characteristics Fluid flow Heat flux Heat transfer Numerical analysis Thermodynamic properties Turbulence models Two-equation turbulence model Velocity distribution
Online Access:	Get full text
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Summary:	Supercritical water, known for its abrupt changes in fluid properties near the pseudocritical region, has always posed a design challenge, leading to enhancement or deterioration in heat transfer. Additionally, the lack of complete understanding of the thermodynamic behavior of supercritical water near the pseudocritical zone, unlike in the subcritical zone, highlights the necessity of a systematic study. Hence, this paper focuses on characterizing the convective upward flow and heat transfer characteristics inside a vertical smooth annular square channel. The numerical analysis uses a steady-state, pressure-based, compressible, Newtonian solver with body force term and two-equation turbulence model to study the influence of variation in pressure, heat flux, and heat-to-mass flux ratios. The flow characteristics and heat transfer behavior of deteriorated, normal, and enhanced heat transfer modes are studied. The heat transfer deterioration is suppressed with the increase in pressure; however, it increases with the increase in inlet bulk temperature. The supercritical boiling number that determines the heat transfer mode is calculated and analyzed for the square annulus section. The evolution of the flow in different heat transfer modes differs based on the effect of buoyancy on the velocity field and the turbulence. The calculated Nusselt numbers match the existing Jackson and Hall correlation well with a maximum absolute error of 9.91%.
ISSN:	0145-7632 1521-0537
DOI:	10.1080/01457632.2022.2162012