TY - GEN
T1 - CFD analysis on two-phase pipe flow of slush nitrogen
AU - Ishimoto, Jun
PY - 2006/4/27
Y1 - 2006/4/27
N2 - CFD analysis on the fundamental two-phase flow characteristics of slush nitrogen in a corrugated duct is conducted to develop effective cooling performance for superconducting cable. First, the governing equations of two-phase slush nitrogen flow based on the unsteady thermal non-equilibrium two-fluid model are constructed and several flow characteristics are numerically calculated taking into account the effects of the slush volume fraction, the thermodynamic behavior of slush, and the duct shape. Results of this research show that it is possible to reduce the pressure loss by using a two-phase slush flow under the high Reynolds number condition. It is also found that the reduction of the pressure loss is dominated not only by applying the appropriate size and volume fraction of slush particles, but also by the slush pumping effect that acts on the liquid-phase acceleration due to the momentum exchange between slush and liquid-phases. Furthermore, it is numerically predicted that with two-phase slush flow, the friction coefficient has a smaller value in the high Reynolds number region than that with single-phase flow.
AB - CFD analysis on the fundamental two-phase flow characteristics of slush nitrogen in a corrugated duct is conducted to develop effective cooling performance for superconducting cable. First, the governing equations of two-phase slush nitrogen flow based on the unsteady thermal non-equilibrium two-fluid model are constructed and several flow characteristics are numerically calculated taking into account the effects of the slush volume fraction, the thermodynamic behavior of slush, and the duct shape. Results of this research show that it is possible to reduce the pressure loss by using a two-phase slush flow under the high Reynolds number condition. It is also found that the reduction of the pressure loss is dominated not only by applying the appropriate size and volume fraction of slush particles, but also by the slush pumping effect that acts on the liquid-phase acceleration due to the momentum exchange between slush and liquid-phases. Furthermore, it is numerically predicted that with two-phase slush flow, the friction coefficient has a smaller value in the high Reynolds number region than that with single-phase flow.
KW - Multiphase flow
KW - Slush nitrogen
KW - Superconducting cable
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U2 - 10.1063/1.2202515
DO - 10.1063/1.2202515
M3 - Conference contribution
AN - SCOPUS:33845392339
SN - 0735403171
SN - 9780735403178
T3 - AIP Conference Proceedings
SP - 1017
EP - 1024
BT - ADVANCES IN CRYOGENIC ENGINEERING
T2 - ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference, CEC
Y2 - 29 August 2005 through 2 September 2005
ER -