基于相变效应的新型主动微阀

S. Bogdanov, X. Riedl, N. Schwesinger
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引用次数: 0

摘要

在这项工作中,我们将展示一种新型的微阀,它利用相变效应来控制流体的流动。该阀门仅由一个微通道组成,微通道的一侧有一个由铜制成的加热元件。此外,阀门可以通过特殊的外部冷却系统进行冷却。如果流过通道的流体温度低于相变温度,它就变成固体。前一种液体的流动将被停止。通过在加热元件上施加电流,可以恢复流动。在这项工作中,我们研究了熔化蜡的流动。熔化温度在80℃以上。蜡的粘度从80℃时的50mPas变化到140℃时的3mPas。我们研究了新的微阀,通道尺寸在直径20毫米到90毫米之间。本文还研究了两种截面呈圆形和椭圆形的通道。蜡的温度范围为80℃~ 140℃。温度为20°C的冷却液冷却阀门。冷却和停止流动的时间常数取决于通道的材料、流体温度和通道的几何形状。它可以在30ms到120ms之间变化。利用硅微技术可以生产这种新型微阀的工艺流程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Active New Microvalve Based on Phase Change Effect
In this work we will show a new type of a microvalve that uses the phase change effect in order to control the flow of a fluid. The valve consists just of a micro channel that possesses a heating element made of copper at one side. Furthermore, the valve can be cooled by a special external cooling system. If the fluid flowing trough the channel gets a temperature below the phase transition temperature it becomes a solid. The flow of the former fluid will be stopped. By means of an electrical current applied on the heating element the flow can be restored. We have investigated in this work the flow of melted wax. The melting temperature is above 80°C. The viscosity of the wax changes from 50mPas at 80°C to 3mPas at 140°C. We investigated new microvalves with channel dimensions between 20 mm and 90 mm in diameter. Two types of the channels, with circled and elliptical shaped cross-section, have been studied, too. The wax temperature varies from 80°C to 140°C. A cooling fluid that possesses a temperature of 20°C cooled the valve. The time constant of cooling and flow stopping depends on the material of the channel, the fluid temperature and the channel geometry. It can vary between 30ms to 120ms. Technological procedures for production of such one he new microvalve can be produced by means of silicon microtechnologies.
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