Thermal modeling of ice cores and boreholes via the finite element technique
An axisymmetric finite element computer program was developed to calculate heat transfer in cylindrical (r-z) geometry. The technique is applicable to steady-state and time-dependent problems and can handle convective, temperature-prescribed and heat-flux-prescribed boundary conditions. It employs t...
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Department of Mechanical Engineering,University of Alaska Fairbanks/Department of Mechanical Engineering,University of Alaska Fairbanks
1994
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ftnipr:oai:nipr.repo.nii.ac.jp:00002231 2023-05-15T17:10:59+02:00 Thermal modeling of ice cores and boreholes via the finite element technique Das,Debendra K. Jois,S. Srikanta 1994-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2231 http://id.nii.ac.jp/1291/00002231/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2231&item_no=1&attribute_id=18&file_no=1 en eng Department of Mechanical Engineering,University of Alaska Fairbanks/Department of Mechanical Engineering,University of Alaska Fairbanks https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2231 http://id.nii.ac.jp/1291/00002231/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 49, 256-280(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2231&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1994 ftnipr 2022-11-12T19:43:03Z An axisymmetric finite element computer program was developed to calculate heat transfer in cylindrical (r-z) geometry. The technique is applicable to steady-state and time-dependent problems and can handle convective, temperature-prescribed and heat-flux-prescribed boundary conditions. It employs the heat capacity method through the Dirac delta function to represent latent heat effect during freezing or thawing and computes movement of the phase front. A number of tests with different materials and boundary conditions were conducted to validate this code against heat transfer situations with and without phase change. The results showed good agreement with exact analytical and numerical solutions. The model was then applied to determine temperature profiles in ice cores. Subsequent investigations were made to determine the rate of freezing in a borehole and the movement of the freeze front with time. Furthermore, results were generated for predicting complete freeze-up of the ice test well maintained by the Polar Ice Coring Office for a number of boundary conditions. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
An axisymmetric finite element computer program was developed to calculate heat transfer in cylindrical (r-z) geometry. The technique is applicable to steady-state and time-dependent problems and can handle convective, temperature-prescribed and heat-flux-prescribed boundary conditions. It employs the heat capacity method through the Dirac delta function to represent latent heat effect during freezing or thawing and computes movement of the phase front. A number of tests with different materials and boundary conditions were conducted to validate this code against heat transfer situations with and without phase change. The results showed good agreement with exact analytical and numerical solutions. The model was then applied to determine temperature profiles in ice cores. Subsequent investigations were made to determine the rate of freezing in a borehole and the movement of the freeze front with time. Furthermore, results were generated for predicting complete freeze-up of the ice test well maintained by the Polar Ice Coring Office for a number of boundary conditions. |
format |
Report |
author |
Das,Debendra K. Jois,S. Srikanta |
spellingShingle |
Das,Debendra K. Jois,S. Srikanta Thermal modeling of ice cores and boreholes via the finite element technique |
author_facet |
Das,Debendra K. Jois,S. Srikanta |
author_sort |
Das,Debendra K. |
title |
Thermal modeling of ice cores and boreholes via the finite element technique |
title_short |
Thermal modeling of ice cores and boreholes via the finite element technique |
title_full |
Thermal modeling of ice cores and boreholes via the finite element technique |
title_fullStr |
Thermal modeling of ice cores and boreholes via the finite element technique |
title_full_unstemmed |
Thermal modeling of ice cores and boreholes via the finite element technique |
title_sort |
thermal modeling of ice cores and boreholes via the finite element technique |
publisher |
Department of Mechanical Engineering,University of Alaska Fairbanks/Department of Mechanical Engineering,University of Alaska Fairbanks |
publishDate |
1994 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2231 http://id.nii.ac.jp/1291/00002231/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2231&item_no=1&attribute_id=18&file_no=1 |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2231 http://id.nii.ac.jp/1291/00002231/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 49, 256-280(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2231&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067802341376000 |