温度に依存する粘度を持つ3次元コンベクションにおける粘度分散
まとめ
地球のマントルでは,下降する冷たいシートと衝突する羽根で,強烈な局所的な加熱が発生します. この粘着性の加熱は,内部放射性崩壊を大幅に上回り,マントルの動力学に影響を与えます.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地球科学 地球科学 地球科学
- コンピューティングジオダイナミクス
背景:
- 地球のマントルのコンベクションは,熱伝達と物質の流れによって引き起こされます.
- 温度に依存する粘度と粘性加熱は,マントルの動態における重要な要因である.
- マントルのコンベクションを正確にシミュレートするには,現実的なレイリー数が必要である.
研究 の 目的:
- 三次元マントルのコンベクションにおける局所的な加熱を調査するために.
- 下降する冷たいシートと衝突する羽根の領域における粘着性の加熱を定量化するために.
- 粘性加熱と内部放射性加熱を比較するために.
主な方法:
- 3次元コンベクションの数値シミュレーション.
- 温度に依存する粘度および粘性加熱を含む.
- 地球のマントルのための現実的なレイリー数を使用した.
主要な成果:
- 下降する冷たいシートの上部で観測された激しい局所的な加熱.
- 顕著な局所的な加熱は,上昇する羽根の頭が表面に衝突する場所で発生します.
- 100の粘度コントラストでは,局所的な熱源は,内部放射性加熱の10倍以上です.
結論:
- 粘着性の分散は,マントルの特定の領域における主要な熱源である.
- 局所的な加熱は,マントルの動力学,特に上部マントルの動力学に大きな影響を与えます.
- 上層層の粘着性の分散の濃度は,放射性加熱に匹敵する.
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