Modeling of a horizontal circulation open loop in two-phase helium |
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Affiliation: | 1. Graduate School of Medicine and Engineering, University of Yamanashi, Kofu 400-8511, Yamanashi, Japan;2. Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan |
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Abstract: | In the process of the cryogenic cooling system design of the superconducting magnet of the R3B spectrometer, heat and mass transfer in a two-phase He I natural circulation loop with a horizontal heated section has been investigated experimentally. The experiments were conducted on a 2 m high experimental loop with a copper tube of 10 mm inner diameter uniformly heated over a length of 4 m. All data were obtained near atmospheric pressure. Evolution of the mass flow rates as a function of heat flux in steady state condition are presented and compared to a numerical model that have been developed to assist the design of such a cooling scheme. The model is based on a one-dimensional equations system, which includes mass, momentum and energy balances. It is based on the homogeneous model with a specific friction coefficient for the horizontal heated section. The model reproduces with an acceptable accuracy the experimental results and now serves as a tool for the design. |
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