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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >INFLUENCE OF ELECTRIC FIELDS ON PRESSURE DROP OF LIQUID CRYSTAL MIXTURE
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INFLUENCE OF ELECTRIC FIELDS ON PRESSURE DROP OF LIQUID CRYSTAL MIXTURE

机译：电场对液晶混合物压降的影响

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摘要

Liquid crystal is one of homogeneous ER (Electro-rheological) fluids in some range of temperature. In the present experiment a liquid crystal mixture is used. The responses of the pressure drop are examined when the liquid crystal mixture flows between two parallel-plate electrodes for the constant flow rates. When the voltages are applied on the liquid crystal mixture and removed, the pressure responses of the inlet of electrodes are measured with the pressure transducer. At the same time, the liquid crystal mixture between the transparent electrodes made of glass is visualized with the video camera to investigate the time history of the director of the liquid crystal mixture. The AC voltages are also used to investigate the dependence of the liquid crystal mixture on the frequency of the voltages. Outlet of the flow channel with two parallel-plate electrodes is atmosphere. Relation between the flow visualization results and the changes of pressure drop is investigated especially for transient period. On the other hand, the pulse-wave voltages are added to the electrodes to control the pressure drop using the pulse width modulation or the pulse frequency modulation. In the present study the flow rates change from 0.001cc/sec (velocity is 1mm/sec) to 0.003cc/sec and the electric field intensity is from 0.2kV/mm to lkV/mm. The gap of the electrodes is 0.2mm.The isotropic-nematic transition is 90.0℃ and smectic-nematic transition is -44.0℃ for the liquid crystal mixture. The open-loop test facility with the liquid crystal is set in a pyrostat to keep the temperature constant.
机译：在某些温度范围内，液晶是均质的ER（电流变）流体之一。在本实验中，使用液晶混合物。当液晶混合物在两个平行板电极之间以恒定流速流动时，检查压降的响应。当将电压施加到液晶混合物上并除去时，用压力传感器测量电极入口的压力响应。同时，用摄像机可视化玻璃制成的透明电极之间的液晶混合物，以研究液晶混合物的指向矢的时间历史。交流电压还用于研究液晶混合物对电压频率的依赖性。具有两个平行板电极的流道出口为大气。研究了流动可视化结果与压降变化之间的关系，特别是在过渡时期。另一方面，使用脉冲宽度调制或脉冲频率调制将脉冲波电压添加到电极以控制压降。在本研究中，流速从0.001cc / sec（速度为1mm / sec）更改为0.003cc / sec，电场强度为0.2kV / mm至1kV / mm。电极间隙为0.2mm。液晶混合物的各向同性向列相转变为90.0℃，近晶向列相转变为-44.0℃。具有液晶的开环测试设备设置在恒温器中，以保持温度恒定。

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