Conveners
C1Po3D - Thermophysical Properties and Transport Processes I
- Michael White
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Mr Changlei Ke (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China,)19/05/2025, 14:00Poster
Helium turbine expanders are widely used in low-temperature refrigeration applications, and the efficiency and performance of their brake impellers directly impact the overall equipment efficiency and stability. This study employs the computational fluid dynamics (CFD) software ANSYS CFX to analyze the performance characteristics of ten brake impellers of varying sizes in helium turbine...
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Zhijian Zhang (Key Laboratory of Cryogenic Science and Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)19/05/2025, 14:00Poster
The sorption pump is a critical component of helium sorption cryocoolers operating in the liquid helium temperature range. Current research on porous materials for sorption pumps predominantly focuses on activated carbon, with limited exploration of alternative porous materials such as carbon nanotubes. Due to differences in elemental composition and molecular structure, the helium adsorption...
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Zhijian Zhang (Key Laboratory of Cryogenic Science and Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)19/05/2025, 14:00Poster
The efficient and long-term storage of cryogenic liquids, such as liquid oxygen and liquefied natural gas, relies heavily on the use of various insulation materials. However, the apparent thermal conductivity data for many insulation materials, including foam glass slabs, high-density polyisocyanurate, and aerogel, under cryogenic and atmospheric pressure conditions remain insufficiently...
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Yingxuan Hu (Zhejiang University, Institute of Refrigeration and Cryogenics)19/05/2025, 14:00Poster
The transient heat transfer in superfluid helium (He II) from curved surfaces presents unique features that differ significantly from planar geometries. We numerically investigate this process by solving the two-fluid model coupled with Vinen's equation for vortex-line density, focusing on how surface curvature affects the propagation of the second sound wave. The numerical model is first...
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Chenghao Dai (Institute of Plasma Physics, Hefei)19/05/2025, 14:00Poster
The helium turbine expander is one of the core components of a helium cryogenic system. The operation of the helium turbine expander varies during variable load adjustments in a helium cryogenic system, and has significant time-varying characteristics. In this paper, numerical simulations are conducted to investigate the time-varying flow field characteristics of the helium turbine during...
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19/05/2025, 14:00
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Brandon Demski19/05/2025, 14:00Poster
Operation of a cryogenic pump near saturated conditions proves challenging to maintain fluid quality throughout the intake process of the pump. Design considerations for minimizing the phase change of fluid across the pump are explored, highlighting the goal of maximizing mass flow throughput of the positive displacement pump. CFD studies were conducted to predict state change performance...
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Prof. Jihao Wu19/05/2025, 14:00Poster
Liquid hydrogen centrifugal pumps play a crucial role in the large-scale transport and utilization of liquid hydrogen as a kind of energy-transporting device with a wide range of application prospects. However, the liquid’s motion within the pump is quite complex, making it challenging to fully determine the properties of the pump and the parameters of the fluid using only analytical methods....
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Jihao Wu19/05/2025, 14:00Poster
Ortho-para hydrogen conversion is a pivotal step in the hydrogen liquefaction process. This study introduces a novel single-fluid conduction-type GM cryocooler heat exchanger designed specifically for hydrogen liquefaction, with its performance enhanced through systematic optimization. The heat exchanger utilizes oxygen-free copper as the conductive material and incorporates ortho-para...
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