Session: K20-03: APPLICATIONS OF COMPUTATIONAL HEAT TRANSFER I

Paper Number: 131404

131404 - Simulation of Supercritical Fluids With Reduced Domains In Horizontal Flows 

Abstract: 

The ability to use supercritical fluids as a heat transfer medium has it benefits near the critical point as the specific heat and thermal conductivity of the fluid approach infinity. However, because of this the heat transfer estimates such as heat transfer coefficient, wall temperature, and fluid bulk temperature can be hard to estimate. With the large changes in fluid properties three-Dimensional simulations have been required to obtain the required fluid bulk and wall temperatures, and heat transfer coefficient, which can be very time consuming. In an attempt to speed up simulation times, a comparison is made between 2D - axisymmetric and 3D horizontal simulations of a heated 500 mm long round tubes with supercritical carbon dioxide using Star CCM+ 2206. Both 2D and 3D cases are investigated at various inlet temperatures, mass flux, heat-flux to mass-flux ratios, pipe diameters, and operating pressures to see when the 2D simulation can be used with good comparison to the 3D cases. The inlet temperature all cases is set to 295, 307, and 315K to get a representation of the fluid acting liquid-like, pseudo-critical, and gas-like. The mass-flux is test at 200, 400 and 600, with heat-flux to mass-flux ratios (being test of 40, 60, and 80. Three different pipe diameters are evaluated at 2, 6 and 12 mm. Four operating pressures are being tested, 7.5, 8, 9, and 10 MPa. A comparison of local heat transfer coefficients and wall temperatures can be shown, and the expected pressure drop. Comparisons of circumferentially averaged heat transfer coefficient, and wall temperature are also compared to the 2D – axisymmetric cases to see how well they agree.

Presenting Author: Devon Hardy Embry-Riddle Aeronautical Univeristy

Presenting Author Biography: Devon grew up fascinated by airplanes watching them fly by. He then went to Northern Arizona University for his undergraduate degree in mechanical engineering before moving across the country to Florida to attend Embry-Riddle Aeronautical University to get his masters and PhD in Aerospace Engineering focusing.

Authors:

Devon Hardy Embry-Riddle Aeronautical Univeristy
Marc Ricklick Embry-Riddle Aeronautical Univeristy
Sandra Boetcher Embry-Riddle Aeronautical University