| Project/Area Number |
04835002
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
惑星科学
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| Research Institution | (Institute of Low Temperature Science), Hokkaido University |
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Principal Investigator |
ARAKAWA Masahiko Hokkaido Univ., Inst.Low Temp.Sci., Assistant, 低温科学研究所, 助手 (10222738)
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| Co-Investigator(Kenkyū-buntansha) |
MAENO Norikazu Hokkaido Univ., Inst.Low Temp.Sci., Professor, 低温科学研究所, 教授 (50001657)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Rheology / Icy satellite / Ammonia-water / Shear stress / Partially melted ice / Viscosity / Geology / Non-Newtonian Fluid / 熱進化 / 外惑星 / 宇宙雪氷 |
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| Research Abstract |
The steady-state deformation of partially melted ice in the ammonia-water system was studied by means of a concentric cylinder viscometer in shear stresses, 10 kPa-0.1 MPa, temperatures, 180-210K and NH_3 contents, 4.0-8.4%. The flow law found was of a non-Newtonian power-law type ; the power index was 4.0(〕SY.+-.〔)0.1. The activation energy at constant melt fractions was 33.7(〕SY.+-.〔)0.8kJ/mol, which was close to that of viscosity for aqueous ammonia solutions. The calculated effective viscosity of partially melted ice at 0.1 MPa was 10^7-10^<10> Pa s, which is by ten orders of maguitudes smaller than that of the ammonia-water mixture in a solid phase below a peritectic point, 176 K.
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