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A Transient Thermal Model of a Neutral Buoyancy Cryogenic Fluid Delivery System
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English
Abstract
A thermal model has been developed to evaluate, from a thermal and performance standpoint, a preliminary design of a Neutral Buoyancy Cryogenic fluid delivery System (NBCS). The NBCS is an important component of a Neutral Buoyancy Portable Life Support System (NBPLSS) to be used by suited astronauts in underwater training for extravehicular activity (EVA) at Johnson Space Center, Houston, Texas.
The Systems Improved Numerical Differencing Analyzer-1985 Fluid Integrator (SINDA'85/FLUINT) program is used to model the NBCS. The modeling decisions are described, based on details of tank construction and material selection, and include the breakdown of the model components into nodes and conductors. The modeling of positional transients which result from moving internal components are presented, including the control of cycling artifacts. The convection and boiling considerations of three tank fluids (cryogenic fluid, 250 psi N2/O2 gas, and water) are presented. Two piston designs are assessed according to performance criteria, with the presentation of temperature and heat transfer rate profiles. Suggestions for subsequent analysis and design modifications are offered.
Authors
Citation
Bue, G. and Conger, B., "A Transient Thermal Model of a Neutral Buoyancy Cryogenic Fluid Delivery System," SAE Technical Paper 911347, 1991, https://doi.org/10.4271/911347.Also In
References
- Globe, S. Dropkin D. “Natural Convection Heat Transfer In Liquids Confined between Two Horizontal Plates,” J. Heat Transfer 24 1959
- Lloyd, J. R. Mooran W. R. “Natural Convection Adjacent to Horizontal Surfaces of Various Planforms,” ASME Paper 74-WA/HT--66 1974
- Churchill, S. W. Chu H. H. S. “Correlating Equations for Laminar and Turbulent Free Convection from a Vertical Plate,” Int. J. Heat Mass Transfer 18 1323 1975
- Clark, J. A. “Cryogenic Technology” Vance R. W. John Wiley & Sons, Inc. New York 1963
- Incropera, F. P. DeWitt D. P. “Fundamentals of Heat and Mass Transfer 2nd 7 John Wiley & Sons 1985