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Influence of gravity on narrow input forced drainage in 2D liquid foams
  • 时间:0
  • 分类:O647.11[理学—物理化学;理学—化学]
  • 作者机构:[1]Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
  • 相关基金:Supported by the National Natural Science Foundation of China(Grant No.20336040) and the Scientific Research Foundation of the State Homan Resource Ministry for Returned Chinese Scholars.
  • 相关项目:化工过程中的时空多尺度结构研究方法及应用
中文摘要:

液体泡沫是在包含表面活化剂或另外的表面活跃的大分子的液体的小数量的煤气的水泡的一件稠密的收拾行李,它是高度组织的材料之一并且拥有特点变阻器软事的逻辑行为。强迫的泡沫排水是通过在在严肃和毛细作用的行动下面的水泡之间的空隙的隧道的网络的常常输入的液体的流动。这个过程包含二机制:最小粘滞液体的流动驱散和水泡的最小的表面精力。为经常的表面活化剂答案,粘滞驱散通常与严肃变化。这个工作报导 2D 的模拟在 8 不同严肃下面在一个 Hele 杂木林房间与狭窄的输入强迫了泡沫排水, g,从 9.8 到 0ms ~(-2) 。液体的传播由于毛状的吸由于严肃行动垂直、水平,随着时间的过去被记录。在有时间的两个方向的排水波浪前面的位置被发现很好尽最大努力被描述法律形式,和代表是 0.536+5.29 x 10 ~(-3) g and0.479-7.27 x 10 ~(-3) g ,分别地当和接近独立于严肃的 1.015 的一个常数时。为 g=9.8 ms~( 计算代表在对由 Hutzler 等的试验性的结果的好同意的 -2), 。并且王。

英文摘要:

Liquid foam is a dense packing of gas bubbles in a small amount of liquid containing surfactants or other surface-active macromolecules, which is one of the highly organized materials and possesses hallmark rheologicsl behaviour of soft matters. Forced foam drainage is the flow of constantly inputted liquid through the network of interstitial channels between bubbles under actions of gravity and caprilarity. This process involves two mechanisms: minimal viscous flow dissipation of liquid and minimal surface energy of bubbles. For constant surfactant solution, viscous dissipation usually varies with gravity. This work reports simulations of 2D forced foam drainage with narrow input in a Hele-Shaw cell under 8 different gravities, g, ranging from 9.8 to 0 ms^-2, The spread of liquid both vertical due to gravity action, and horizontal due to capillary suction, is recorded over time. Positions of drainage wave fronts in both directions with time are found to be well described in the power law form, and the exponents are 0.536+5.29 ×10^-3g and 0.479-7.27 × 10^-3g, respectively, while the sum is close to a constant of 1.015 which is independent of gravity. For g=9.8 ms^-2, the calculated exponents are in good agreement with experimental results by Hutzler et al. and Wang.

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