Premium
Convection Heat Transfer of CO 2 at Supercritical Pressures in Microtubes
Author(s) -
Yang F.Y.,
Wang K.,
Liu T.,
Wang Y.Q.,
Liu Z.C.
Publication year - 2013
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300245
Subject(s) - supercritical fluid , heat transfer , buoyancy , thermodynamics , convective heat transfer , turbulence , dynamic scraped surface heat exchanger , materials science , convection , heat exchanger , mechanics , heat transfer coefficient , critical heat flux , chemistry , physics
Abstract Convection heat transfer of supercritical pressure CO 2 in microtubes as well as characteristics of fluid flow and heat transfer were investigated. Alterations of physical properties of supercritical CO 2 and the impact of buoyancy on the heat transfer were analyzed when the inlet Reynolds (Re) number of CO 2 , 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 CO 2 changed significantly around the critical point, causing a distinct decline of buoyancy and strengthening of heat transfer.