Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 64, Issue -, Pages 212-223Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2013.04.033
Keywords
Numerical simulation; Mixed convection; Supercritical CO2; Heat transfer
Categories
Funding
- Natural Science Foundation of China [51006035, U1034004]
- Natural Science Foundation of China of International cooperation project [51210011]
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We performed the numerical simulations of laminar mixed convective flow and heat transfer in a 0.5 mm diameter and 1000.0 mm length tube. The supercritical carbon dioxide in the tube was cooled at constant wall temperature. The inclination angles were in the range of -90 degrees (vertical downward flow) to 90 degrees (vertical upward flow). The velocity and temperature distributions, secondary flow, friction factor and heat transfer coefficient were plotted vs. inclination angles and gravity force magnitudes. The kinetic energy of secondary flow was introduced to quantify its effect on the heat transfer. It is found that under the mixed convective flow and heat transfer conditions, the horizontal flow display the largest heat transfer coefficients. The inclined flows at alpha = -30 degrees and 30 degrees also behave better heat transfer performance among various inclination angles. The effect of inclined angles on the heat transfer is decreased with decreases in the gravity force magnitudes. The combined parameter of Gr/Re-b(2) was used to quantify the buoyancy force effect on the flow and heat transfer. (C) 2013 Elsevier Ltd. All rights reserved.
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