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首页> 外文会议>6th international conference on nanochannels, microchannels and minichannels 2008 >Mathematical Modeling of Rivulet Flow Driven by Variable Gravity and Gas Flow in a Minichannel
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Mathematical Modeling of Rivulet Flow Driven by Variable Gravity and Gas Flow in a Minichannel

机译：小通道中可变重力和气流驱动的小流流动的数学建模

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摘要

Rivulet flows are a special type of thin film flows with a bounded width. The use of rivulet flows is very perspective in various types of process equipment such as evaporators. The flow dynamics in rivulets has some peculiarities, the investigation of which allows understanding the gist of possible mechanism of enhancement of heat transfer. In the present work a mathematical model for the rivulet flow in conditions of a variable gravity has been elaborated. The liquid flow takes place in a slot between two plates and is caused by a co-current gas flow. The numerical calculations of the flow parameters depending from the gravity forces have been made. The analytical formula for connection of the main rivulet parameters (width, contact angle, liquid flow rate ...) in a linearized approach has been derived. The comparison of numerical results with experimental data obtained during 44 Parabolic Flights campaign of the European Space Agency has been carried out. Liquid film of FC-72 driven by the Nitrogen gas has been studied in experiments. Force balance is changed during a parabolic flight and due to surface tension effect the liquid film in a horizontal minichannel 40 mm width became a flattened rivulet 9 mm width at microgravity.
机译：小流是具有限制宽度的一种特殊类型的薄膜流。在各种类型的过程设​​备（例如蒸发器）中，小溪流的使用非常有前景。细流中的流动动力学具有一些特殊性，对其进行的研究可以理解增强传热的可能机理的要旨。在目前的工作中，已经建立了在可变重力条件下溪流流动的数学模型。液体流在两个板之间的缝隙中发生，并且是由并流气流引起的。根据重力对流动参数进行了数值计算。推导了以线性化方法连接主要小溪参数（宽度，接触角，液体流速...）的解析公式。数值结果与在欧洲航天局的44次抛物线飞行运动中获得的实验数据进行了比较。实验研究了氮气驱动的FC-72液膜。在抛物线飞行过程中，力平衡发生了变化，并且由于表面张力效应，水平微通道40 mm宽度的液膜在微重力作用下变成了平整的小溪，宽度为9 mm。

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  • 会议地点 Darmstadt(DE);Darmstadt(DE)
  • 作者

    Bartashevich M.V.; Kuznetsov V.V.; Kabov O.A.;

  • 作者单位

    Institute of Thermophysics, Russian Academy of Sciences, prosp. Lavrentyev 1, Novosibirsk, 630090 Russia;

    Lavrentyev Institute of Hydrodynamics, Russian Academy of Sciences, prosp. Lavrentyev 15, Novosibirsk, 630090 Russia;

    Universite Libre de Bruxelles, Chimie-Physique EP-CP165/62, Microgravity Research Center, Avenue F.D.Roosevelt 50, Bruxelles, B-1050, Belgium Institute of Thermophysics, Russian Academy of Sciences, prosp. Lavrentyev 1, Novosibirsk, 630090 Russia;

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