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首页> 外文会议>International conference on nanochannels, microchannels and minichannels >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：迷你宣传中的可变重力驱动的溪流流动的数学建模

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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：Rivulet流动是一种具有界宽的特殊类型的薄膜流。 Rivulet流动的使用是在诸如蒸发器的各种类型的过程设​​备中非常透视。 Rivulets的流动动力学具有一些特殊性，其调查允许理解增强传热的可能机制的主旨。在本工作中，已经详细阐述了在可变重力的条件下的Rivulet流动的数学模型。液体流动在两个板之间的槽中进行，并且由电流气体流动引起。已经进行了根据重力力的流量参数的数值计算。用于连接线性化方法的主要Rivulet参数（宽度，接触角，液体流速...）的分析公式。已经进行了在44个抛物面飞行欧洲航天局的飞行期间获得的实验数据的数值结果的比较。在实验中研究了由氮气驱动的Fc-72的液膜。在抛物线飞行期间改变力平衡，由于表面张力效果，水平迷你槽40mm宽度的液体膜变得在微匍匐处的扁平升高的宽度9mm宽度。

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