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Excess Pressure Inside a Drop and a Bubble01:13

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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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预测超流体中的气泡碎片化

Jake McMillan1, Thomas A Flynn1, Ryan Doran1

  • 1Joint Quantum Centre (JQC) Durham-Newcastle, School of Mathematics, Statistics and Physics, <a href="https://ror.org/01kj2bm70">Newcastle University</a>, Newcastle upon Tyne, NE1 7RU, United Kingdom.

Physical review letters
|September 13, 2024
PubMed
概括
此摘要是机器生成的。

研究人员研究了二进制不可混合的斯-爱因斯坦凝聚物,发现韦伯数类比可以预测泡碎片化. 这项工作探讨了异国情调的超流体动力学和多相凝聚物中的流流.

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科学领域:

  • 量子物理学的量子物理学
  • 凝聚物质物理学 凝聚物质物理学
  • 流体动力学 流体动力学

背景情况:

  • 经典流体使用韦伯数来描述多相流.
  • 波斯-爱因斯坦凝结体 (BECs) 提供了与经典多相流体的超流体模拟.
  • 超流体混合物表现出超出单元系统的复杂动态.

研究的目的:

  • 系统地研究一个二维二进制不可混合的斯-爱因斯坦凝聚物的动力学.
  • 探索第二个组件泡在第一组件动中的作用.
  • 识别控制系统行为,特别是泡碎片化的无维参数.

主要方法:

  • 模拟一个二维二进制不混合的斯-爱因斯坦凝结体.
  • 系统地改变气泡大小和速度以""初级凝结物.
  • 将流流失的临界速度绘制为泡大小的函数.
  • 分析泡碎片化的动态.

主要成果:

  • 确定了与气泡大小相关的流流失的临界速度.
  • 观察到系统动态取决于最初的泡大小和速度.
  • 证明了韦伯数类比器可以准确预测泡碎片化.

结论:

  • 这项研究建立了泡动态和二进制BEC中的超流体行为之间的定量联系.
  • 韦伯数类比是理解这些系统中碎片化的关键无维参数.
  • 这项研究提供了关于多相超流体的异国情调的见解.