Heat generated by cutting ice in deep ice-core drilling
In order to understand and solve the ‘warm-ice problem’ in deep ice-core drilling, we applied the metal-cutting theory to ice and estimated the heat generated during ice coring taking into account the mechanical and thermal properties of the ice and cutters. We found that (1) most of the heat in cut...
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Published in | Annals of glaciology Vol. 47; pp. 61 - 67 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Cambridge, UK
Cambridge University Press
2007
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Abstract | In order to understand and solve the ‘warm-ice problem’ in deep ice-core drilling, we applied the metal-cutting theory to ice and estimated the heat generated during ice coring taking into account the mechanical and thermal properties of the ice and cutters. We found that (1) most of the heat in cutting is generated by shear deformation at the shear plane of ice, and the heat could increase the chip temperature by several degrees; (2) the rake angle of the cutter has more influence on the temperature increase in chips than the barrel rotation speed and penetration pitch; (3) if the cutter is made of a material with larger thermal conductivity, the temperature increase in the chips can be reduced; and (4) if the density of the liquid is less than the density of ice, the cutting chips sink to the bottom and the friction heat generated by the drill head and slush can raise the ambient temperature of the drill head by several degrees. |
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AbstractList | Abstract
In order to understand and solve the ‘warm-ice problem’ in deep ice-core drilling, we applied the metal-cutting theory to ice and estimated the heat generated during ice coring taking into account the mechanical and thermal properties of the ice and cutters. We found that (1) most of the heat in cutting is generated by shear deformation at the shear plane of ice, and the heat could increase the chip temperature by several degrees; (2) the rake angle of the cutter has more influence on the temperature increase in chips than the barrel rotation speed and penetration pitch; (3) if the cutter is made of a material with larger thermal conductivity, the temperature increase in the chips can be reduced; and (4) if the density of the liquid is less than the density of ice, the cutting chips sink to the bottom and the friction heat generated by the drill head and slush can raise the ambient temperature of the drill head by several degrees. In order to understand and solve the ‘warm-ice problem’ in deep ice-core drilling, we applied the metal-cutting theory to ice and estimated the heat generated during ice coring taking into account the mechanical and thermal properties of the ice and cutters. We found that (1) most of the heat in cutting is generated by shear deformation at the shear plane of ice, and the heat could increase the chip temperature by several degrees; (2) the rake angle of the cutter has more influence on the temperature increase in chips than the barrel rotation speed and penetration pitch; (3) if the cutter is made of a material with larger thermal conductivity, the temperature increase in the chips can be reduced; and (4) if the density of the liquid is less than the density of ice, the cutting chips sink to the bottom and the friction heat generated by the drill head and slush can raise the ambient temperature of the drill head by several degrees. |
Author | Tanabe, Ikuo Motoyama, Hideaki Azuma, Nobuhiko |
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Cites_doi | 10.1098/rspa.1976.0013 10.3189/S0022143000215608 10.1017/S0022143000011874 10.1016/S0165-232X(03)00036-3 10.3189/172756407786857767 10.3189/172756407786857820 |
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References | Augustin, Panichi, Frascati 2007b; 47 Talalay 2003; 37 Gold 1977; 19 Evans, Nye, Cheeseman 1976; 347 Jaeger 1942; 76 Jones 1982; 28 Loewen, Shaw 1954; 76 Augustin 2007a; 47 Gold (S0260305500253342_ref004) 1977; 19 S0260305500253342_ref003 S0260305500253342_ref002 S0260305500253342_ref001 S0260305500253342_ref008 Jaeger (S0260305500253342_ref0004) 1942; 76 S0260305500253342_ref005 Kobayashi (S0260305500253342_ref006) 1994 Loewen (S0260305500253342_ref007) 1954; 76 |
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Snippet | In order to understand and solve the ‘warm-ice problem’ in deep ice-core drilling, we applied the metal-cutting theory to ice and estimated the heat generated... Abstract In order to understand and solve the ‘warm-ice problem’ in deep ice-core drilling, we applied the metal-cutting theory to ice and estimated the heat... In order to understand and solve the 'warm-ice problem' in deep ice-core drilling, we applied the metal-cutting theory to ice and estimated the heat generated... |
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Title | Heat generated by cutting ice in deep ice-core drilling |
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