Heat transfer to supercritical carbon dioxide in tubes with mixed convection

Conference · Tue Jul 01 04:00:00 EDT 1997

OSTI ID:20014383

Walisch, T; Doerfler, W; Trepp, Ch

The heat transfer to supercritical carbon dioxide has been measured in horizontal, vertical and inclined tubes at constant wall temperature for turbulent flow at Re-numbers between 2,300 and 1 x 10{sup 5}. The influence of the variation of physical properties due to the vicinity of the critical point has been examined, as well as the influence of the direction of flow. Therefore most of the measurements has been conducted at pseudocritical points. These are supercritical points where the behavior of the physical properties is similar to the behavior at the critical point, but to a lesser degree. At such points the heat capacity shows a maximum; density, viscosity and heat conductivity are changing very fast. Due to the variations in physical properties, especially under the influence of buoyancy, the heat transfer can be significantly alterated compared to the well known conditions at buoyancy-free turbulent flow. It has to be noted that this behavior is most accentuated at the pseudocritical points that are nearest the critical point. Finally the heat transfer at the examined supercritical states has been described by correlations from the Dittus-Boelter type.

• Research Organization: ETH Zentrum, Zurich (CH)
• Sponsoring Organization: Swiss Federal Institute of Technology
• OSTI ID: 20014383
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CARBON DIOXIDE
EXPERIMENTAL DATA
FORCED CONVECTION
NATURAL CONVECTION
SUPERCRITICAL GAS EXTRACTION
SUPERCRITICAL STATE
THERMODYNAMIC PROPERTIES
TURBULENT FLOW
USES
WASTE PROCESSING