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Electrostatic Boundary Conditions in Dielectrics01:27

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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高効率の電熱冷却と静電操作

Rujun Ma1, Ziyang Zhang1, Kwing Tong1

  • 1Department of Materials Science and Engineering, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, CA 90095, USA.

Science (New York, N.Y.)
|September 16, 2017
PubMed
まとめ

研究者たちは 電気カロリー (EC) ポリマーを用いた 効率的な固体冷却装置を開発しました このコンパクトで表面に適合する技術は,実用的なアプリケーションのために高い冷却能力と性能係数 (COP) を達成します.

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科学分野:

  • 材料科学
  • 熱力学について
  • 固体物理学

背景:

  • 従来の冷却システムは,効率と適用範囲の制限に直面しています.
  • 固体冷却には潜在的な利点がありますが,しばしば高特異冷却能力と性能係数 (COP) が不足しています.
  • 現存する表面適合型固体冷却技術は,しばしば効率が低く,コンパクトである.

研究 の 目的:

  • 固体冷却装置の開発 固体冷却装置の開発 固体冷却装置の開発
  • コンパクトで表面に適合する冷却ソリューションを作成します.
  • 高い冷却能力と性能係数 (COP) を達成する.

主な方法:

  • 柔軟な電熱 (EC) ポリマーフィルムを使用した.
  • 回転可能な静電力の静電動作メカニズムを実装した.
  • 良好な熱コンタクトを通して効率的な熱伝送を保証します.

主要な成果:

  • EC装置は1グラムあたり2.8ワットの特異的な冷却力を達成した.
  • 13の性能係数 (COP) が記録された.
  • 装置は高固有の熱力学的効率を示した.

結論:

  • 開発されたEC冷却装置は,既存の表面適合型固体冷却技術よりも効率的でコンパクトです.
  • この技術は,効率的で直接的な表面冷却を必要とする実用的なアプリケーションのための有望な経路を提供します.
  • この進歩は,現在の固体冷却の主要な限界に対処します.