Behavior of Subcooling Jet Injected into a Bulk Liquid in a Tank under Normal- and Micro-gravity Conditions

DOI:10.15011/jasma.36.360402
Int. J. Microgravity Sci. Appl. 2019p360402
Author
O. KAWANAMI, K. TAKEDA, R. NAGUCHI, R. IMAI, Y. UMEMURA, T. HIMENO
Organization
Department of Mechanical Engineering, University of Hyogo, Department of Engineering, Muroran Institute of Technology, Japan Aerospace Exploration Agency, Department of Aeronautics and Astronautics, University of Tokyo
Abstract
In the future exploration for deep space, cryogenic fluid will be used as propellant and oxidizer for spacecraft. The increasing of tank pressure is caused by boil off gas (BOG) induced by heat leakage into the tank from the surrounding environment. Reducing of BOG is derived from destroy of thermal stratification of a bulk liquid in the tank. Therefore, development of Thermodynamic Vent System (TVS) for the purpose of prevent of loss of cryogenics propellant in future space system is needed. TVS combining jet mixing, spray, and heat spot removal by forced cooling using Electro-hydro-dynamics is under consideration by authors. Destroying thermal stratification without venting by using subcooling mixing jet will be developed for a key technology of TVS. In this paper, the behavior of the mixing jet by visualization method and description about the motion of the jet with a simple one-dimensional model without heat transfer report. In our simple dynamic model, a single sphere droplet as the tip of the jet and an equation of the motion is applied for the droplet. The results of analysis model and experimental data taken by shadowgraph system are compared. In addition, microgravity experiment is performed, and flow behavior in microgravity is described.
Keyword(s)
Jet mixing, Visualization, Dynamic analysis model, Microgravity
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Received 30 August 2019, Accepted 22 October 2019, Published 31 October 2019

© The Japan Society of Microgravity Applicaiton

この投稿文は次の言語で読めます: Japanese

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