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Viscosity measurement from microscale convection at high pressure and temperature

机译：高压和温度下微米对流的粘度测量

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摘要

Measurements of induced thermal convection have been used to study fluid viscosity at simultaneous high pressure and temperature conditions. Direct observations of flow were made by tracking entrained particles in samples melted by laser heating during high-pressure confinement. Finite element models confirmed thermal convection as the origin of the detected motions, and were refined to assess the fluid viscosity. Observations of flow in ethanol partially melted in the laser-heated diamond anvil cell at 2-3 GPa point to a sharply rising viscosity at room temperature above the equilibrium solidification pressure, similar to that seen previously in methanol. The analysis shows that measurement of viscosity from convective flow in laser-heated fluids under static pressure is a promising strategy to determine viscosity at ultrahigh pressures, where high melting temperatures and small samples preclude application of traditional viscometric techniques. The data confirm theoretical predictions of detectable natural convection at ultralow Rayleigh numbers (Ra 1) in a microscopic system having sufficiently large temperature gradients.
机译：诱导热对流的测量已被用于在同时高压和温度条件下研究流体粘度。通过在高压限制期间通过激光加热熔化的样品中的夹带颗粒跟踪夹带颗粒来进行流动的直接观察。有限元模型确认了热对流作为检测到的运动的起源，并被精制地评估流体粘度。在2-3GPa的激光加热的金刚石砧座中，在高于平衡凝固压力的室温下，在激光加热的金刚石砧座中，在激光加热的金刚石砧座上熔化的乙醇中的流动观察结果急剧上升，类似于先前在甲醇中观察到的粘度。分析表明，在静压下激光加热流体中的对流流动的粘度的测量是确定超高压力粘度的有希望的策略，其中高熔点温度和小型样品妨碍了传统粘度技术的应用。数据确认在具有足够大的温度梯度的微观系统中的超级瑞利数（RA 1）的可检测自然对流的理论预测。

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  • 来源
    《Physical review》 |2020年第14期|144202.1-144202.6|共6页
  • 作者

    Hannah B. Bartlett; Natalia Gomez-Perez; Michiel Hermes; R. Stewart McWilliams;

  • 作者单位

    School of Physics and Astronomy and Centre for Science at Extreme Conditions University of Edinburgh EH9 3FD Edinburgh United Kingdom;

    School of Physics and Astronomy and Centre for Science at Extreme Conditions University of Edinburgh EH9 3FD Edinburgh United Kingdom School of Mathematics Statistics and Physics Newcastle University NE1 7RU Newcastle upon Tyne United Kingdom British Geological Survey Edinburgh Currie EH14 4BA United Kingdom;

    School of Physics and Astronomy and Centre for Science at Extreme Conditions University of Edinburgh EH9 3FD Edinburgh United Kingdom Soft Condensed Matter Group Utrecht University 3584 CC Utrecht Netherlands;

    School of Physics and Astronomy and Centre for Science at Extreme Conditions University of Edinburgh EH9 3FD Edinburgh United Kingdom;

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