Convection Heat Transfer of CO2 at Supercritical Pressures in Microtubes

Convection heat transfer of supercritical pressure CO2 in microtubes as well as characteristics of fluid flow and heat transfer were investigated. Alterations of physical properties of supercritical CO2 and the impact of buoyancy on the heat transfer were analyzed when the inlet Reynolds (Re) number...

Full description

Saved in:
Bibliographic Details
Published in:Chemical engineering & technology 2013-12, Vol.36 (12), p.2051-2056
Main Authors: Yang, F.-Y., Wang, K., Liu, T., Wang, Y.-Q., Liu, Z.-C.
Format: Article
Language:English
Subjects:
Buoyancy
Computational fluid dynamics
Convection transfer
Supercritical CO2
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Convection heat transfer of supercritical pressure CO2 in microtubes as well as characteristics of fluid flow and heat transfer were investigated. Alterations of physical properties of supercritical CO2 and the impact of buoyancy on the heat transfer were analyzed when the inlet Reynolds (Re) number of CO2, diameter of heat exchanger, and inlet Re of cooling water were changed. The temperatures of hot fluid in numerical simulations from several classical turbulence calculation models were compared with experimental results from the literature. The physical properties of CO2 changed significantly around the critical point, causing a distinct decline of buoyancy and strengthening of heat transfer. The impact of buoyancy and viscous forces on heat transfer of supercritical CO2 is mainly determined by experimental measures. Here, the impact of buoyancy on the heat transfer rate of a double‐pipe heat interchanger was evaluated by means of CFD. Accuracy and reliability of the simplified numerical model were verified by comparing the results with experimental data in the literature.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201300245