Numerical investigation of heat transfer in supercritical CO2 and water turbulent flow in circular tubes

[Display omitted] •Simulation of supercritical CO2 and water flow in a vertical tube is conducted.•An investigation on the effect of flow acceleration and buoyancy on heat transfer of supercritical fluid is presented.•A new correlation for heat transfer coefficient based on the acceleration and buoy...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2017-01, Vol.119, p.88-103
Main Authors: Bovard, Samaneh, Abdi, Mehdi, Nikou, Mohammad Reza Khosravi, Daryasafar, Amin
Format: Article
Language:English
Subjects:
Buoyancy effect
CFD simulation
Flow acceleration effect
Heat-transfer deterioration
Supercritical fluid
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Summary:[Display omitted] •Simulation of supercritical CO2 and water flow in a vertical tube is conducted.•An investigation on the effect of flow acceleration and buoyancy on heat transfer of supercritical fluid is presented.•A new correlation for heat transfer coefficient based on the acceleration and buoyancy is proposed. This study presents a numerical investigation of heat transfer in supercritical CO2 and water turbulent flow in a circular tube. To solve two-dimensional grid systems, RSM turbulent models were used. The effect of mass flow rate and pressure on heat transfer coefficient, flow acceleration and buoyancy parameter were investigated. The numerical results demonstrated that increasing the mass flux causes to decrease buoyancy and flow acceleration. In addition, an increase in pressure results in a decrease in buoyancy and flow acceleration terms. Finally, a new correlation is proposed to enumerate the effect of flow acceleration and buoyancy on heat transfer phenomena in a vertical upward flow of a supercritical fluid.
ISSN:0896-8446
1872-8162
DOI:10.1016/j.supflu.2016.09.010