Conveners
C2PoJ - Fluid Mechanics, Heat Transfer and Cryogen Properties I
- Jaroslaw Fydrych (European Spallation Source ERIC)
- John Pfotenhauer (University of Wisconsin-Madison)
Based on the traditional heat exchanger design method, the sub-atmospheric plate-fin heat exchanger in superfluid helium refrigeration system is designed by calculating with distributed parameter differential element method. This enables to obtain the geometry，temperature distribution and the pressure drop inside the heat exchanger. So that the optimal solution can be selected after comparing...
Wall-type heat exchanger(WTHX) and Fin-type heat exchanger(FTHX) are attached to the first and second stage cold head of two G-M crycoolers respectively in the simulating experimental platform of the internal purifier(SEPEIP). WTHX and FTHX play a significant role in SEPEIP, WTHX is designed to remove heat from helium and freeze-out extremely few impurities, FTHX is for further cooling the...
Both numerical and analytical models are developed to characterize the heat and mass transfer processes in a cryogenic CO2, N2 mixture gas de-sublimating within a cross-flow finned duct heat exchanger system. Heat is transferred across the exchanger from the mixture gas to a flow of cold gas (either nitrogen or helium). The approach follows analyses similar to those used to characterize the...
A computational fluid dynamics (CFD) model with simplified structure and periodic boundary conditions is applied to the shell side of spiral-wound heat exchangers. And a series of numerical investigations on heat transfer and flow characteristics are carried out using this model. The heat transfer coefficients on the bottom of tubes increases first and then decreases with radial angle, because...
To design the heat exchanger, whose effectiveness and pressure loss meet the process requirements, by using the minimum volume, the effects of geometric parameters on multi-stream parallel flow pilate-fin heat exchangers’ effectiveness and pressure loss should be studied. Using both numerical and experimental methods, this paper studies these effects. The results obtained in this paper are...
With high specific heat and density, supercritical helium can be used to reduce the temperature fluctuation and improve temperature uniformity in the low temperature conditions. However, the natural convection of the supercritical helium has a great influence on the suppression of the temperature oscillation. In this paper, a transient three-dimensional numerical simulation is carried out for...
