Accession Number N20130000442
Title Transport of Mass, Energy, and Entropy in Cryogenic Support Struts for Engineering Design.
Publication Date Aug 2012
Media Count 43p
Personal Author J. P. Elchert
Abstract Engineers working to understand and reduce cryogenic boil-off must solve a variety of transport problems. An important class of nonlinear problems involves the thermal and mechanical design of cryogenic struts. These classic problems are scattered about the literature and typically require too many resources to obtain. So, to save time for practicing engineers, the author presents this essay. Herein, a variety of new, old, and revisited analytical and finite difference solutions of the thermal problem are covered in this essay, along with commentary on approach and assumptions. This includes a few thermal radiation and conduction combined mode solutions with a discussion on insulation, optimum emissivity, and geometrical phenomenon. Solutions to cooling and heat interception problems are also presented, including a discussion of the entropy generation. The literature on the combined mechanical and thermal design of cryogenic support struts is reviewed with an introduction to the associated numerical methods.
Keywords Cryogenics
Emissivity
Energy transfer
Entropy
Evaporation
Finite difference theory
Interception
Numerical analysis
Struts


 
Source Agency National Aeronautics and Space Administration
NTIS Subject Category 46B - Fluid Mechanics
Corporate Author National Aeronautics and Space Administration, Cleveland, OH. NASA John H. Glenn Research Center at Lewis Field.
Document Type Conference proceedings
Title Note N/A
NTIS Issue Number 1316
Contract Number N/A

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