کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8915750 | 1641466 | 2018 | 44 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Numerical experiments on thermal convection of highly compressible fluids with variable viscosity and thermal conductivity: Implications for mantle convection of super-Earths
ترجمه فارسی عنوان
آزمایش های عددی روی حرارتی مایعات بسیار فشرده با ویسکوزیته متغیر و هدایت حرارتی: پیامدهای انتقال گرانشی ابرهای زمین
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کلمات کلیدی
کنسانتره مانت، فوق العاده زمین، فشرده سازی آدیاباتیک، ویسکوزیته وابسته به دما، هدایت گرما وابسته به عمق،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
We conduct a series of numerical experiments of thermal convection of highly compressible fluids in a two-dimensional rectangular box, in order to study the mantle convection on super-Earths. The thermal conductivity and viscosity are assumed to exponentially depend on depth and temperature, respectively, while the variations in thermodynamic properties (thermal expansivity and reference density) with depth are taken to be relevant for the super-Earths with 10â¯times the Earth's. From our experiments we identified a distinct regime of convecting flow patterns induced by the interplay between the adiabatic temperature change and the spatial variations in viscosity and thermal conductivity. That is, for the cases with strong temperature-dependent viscosity and depth-dependent thermal conductivity, a “deep stratosphere” of stable thermal stratification is formed at the base of the mantle, in addition to thick stagnant lids at their top surfaces. In the “deep stratosphere”, the fluid motion is insignificant particularly in the vertical direction in spite of smallest viscosity owing to its strong dependence on temperature. Our finding may further imply that some of super-Earths which are lacking in mobile tectonic plates on their top surfaces may have “deep stratospheres” at the base of their mantles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 274, January 2018, Pages 23-36
Journal: Physics of the Earth and Planetary Interiors - Volume 274, January 2018, Pages 23-36
نویسندگان
Masanori Kameyama, Mayumi Yamamoto,