Conveners
C3OrG - Nitrogen Fluid Mechanics and Heat Transfer
- John Jurns (European Spallation Source ERIC)
- Diego Fonseca (University of Wisconsin-Madison)
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Torsten Koettig (CERN)12/07/2017, 14:00Contributed Oral Presentation
The large-scale liquid argon Short Baseline Neutrino Far-Detector located at Fermilab is designed to detect neutrinos allowing research in the field of neutrino oscillations. It will be filled with liquid argon and operate at almost ambient pressure. Consequently, its operation temperature is determined at about 87 K. The detector will be surrounded by a thermal shield, which is actively...
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Bertrand Baudouy (CEA Saclay)12/07/2017, 14:15Contributed Oral Presentation
Two-phase heat and mass transfer in nitrogen has been experimentally investigated in a natural circulation loop. The experiments were realized in steady-state conditions near atmospheric pressure with a 10 mm inner diameter vertical copper tube, uniformly heated over roughly 1 m in length. The vapor and total mass flow rates and the wall temperature were measured as a function of the tube heat...
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Mr Yixiao Ruan12/07/2017, 14:30Contributed Oral Presentation
In the cryogenic wind tunnel, cooling the circulating gas to cryogenic temperature by spraying liquid nitrogen (LN2) is an efficient way to increase the Reynolds number. The evaporation and motion of LN2 droplets in the high-speed gas flow is the critical process that determines the cooling rate, cooling capacity and the safe operation of the down-stream compressor. In this study, a numerical...
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Mr Yixiao Ruan12/07/2017, 14:45Contributed Oral Presentation
Increasing the Reynolds number capability of large wind tunnels is of great importance for the aerodynamic tests, especially in high-speed wind tunnels. Among various methods to increase Reynolds number in transonic wind tunnels, cooling the gas to cryogenic temperature is the optimal solution. In cryogenic wind tunnels, spraying liquid nitrogen has the advantages of rapid and high cooling...
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Mr Jiakai Zhu (Institute of Refrigeration and Cryogenics, Zhejiang University)12/07/2017, 15:00Contributed Oral Presentation
Jikai Zhu, Xiaobin Zhang
Institute of Refrigeration and Cryogenics, Zhejiang University; The Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou, 310027, China
Unsteady cavitation characteristics of liquid nitrogen flow through a transparent venturi tube are experimentally and numerically investigated in a variable pressure ratio tunnel. As the pressure...
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Mr Xiaobin Zhang (Zhejiang University)12/07/2017, 15:15Contributed Oral Presentation
The dynamic cavitation characteristics of liquid nitrogen flow over a three dimensional hydrofoil are experimentally investigated in a variable pressure ratio tunnel. The temperature and pressure in the cavity as well as the flow rate are synchronously measured, together with the visual observation of the cavitation unsteady behaviors using the high-speed camera. Cavitation evolutions in a...
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Ms Rong Xue (Xi'an Jiaotong University), Mr Yixiao Ruan (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University)12/07/2017, 15:30Contributed Oral Presentation
The cavitating flow within liquid nitrogen spray nozzles has a profound impact on the spray atomization characteristics and its cooling performance. The CFD simulation is effective for showing the details of complicated and cavitating flow driven by high injection pressure together with small dimensions of the nozzle. The widely used cavitation models including Schnerr and Sauer,...
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Prof. Tao Jin (Institute of Refrigeration and Cryogenics, Zhejiang University)12/07/2017, 15:45Contributed Oral Presentation
Abstract: Slush nitrogen has lower temperature, higher density and higher heat capacity than those of liquid nitrogen at normal boiling point, and is considered a potential coolant for high-temperature superconducting cables with decreased nitrogen consumption and storage cost. The corrugated pipe can help to compensate the thermal stress generated at low temperature through axial...
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