2022-09-232022-09-23197013806299https://hdl.handle.net/10657/11969A thermal performance analysis of a fin-tube thermal radiation heat shield suspended in the vacuum space between two parallel flat plates is presented. One of the plates is maintained at a constant elevated temperature while the other plate is used as a low temperature sink. This two-dimensional model of a cryogenic Dewar vessel vapor-cooled shield includes consideration of several effects usually neglected in shield analysis. These considerations include local dependence of plate thermal conductivity and emissivity on surface temperature, in addition to the variable fluid properties within the tube. The results of the analysis are used to assess the effectiveness of vapor-cooled shields in reducing the heat transfer from source (Dewar outer shell) to sink (Dewar inner shell).application/pdfenThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.Thesisreformatted digital