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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >A NUMERICAL INVESTIGATION OF THE FREE SURFACE FLOW DURING OPTICAL FIBER COATING PROCESS
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A NUMERICAL INVESTIGATION OF THE FREE SURFACE FLOW DURING OPTICAL FIBER COATING PROCESS

机译：光纤涂覆过程中自由表面流动的数值研究

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Optical fiber has increasingly played a crucial role in the information transmission area nowadays. The elevated demand makes it necessary to manufacture high quality light-guide fibers that have proper mechanical properties to endure the stresses induced during installations and operations. Optical fiber coating process provides a protection layer to shield the fiber from surface abrasion and also to increase the fiber's tensile strength. However, there are problems encountered during this process which reduce the coating quality. One of the major problems is air entrainment, which may lead to eccentrical or incomplete coating. Apparently, it is of great interest to study this problem to improve the coating quality. Many experimental studies have been performed on the dynamic contact angle, air entrainment velocity and their correlation with various parameters, such as the viscosity and the surface tension of coating materials, fiber drawing speed, etc. Nevertheless, how the coating flow affects the upper meniscus (directly related with dynamic contact angle and air entrainment) has not been intensively studied. Understanding of the effects is essential to improve the coating quality. To fulfill this requirement, the present work focused on investigating the relation of upper meniscus and fiber drawing speed. This is just the first part of the serial study on the optical fiber coating process. Firstly, a numerical code was developed with finite volume formulation. The results showed that the code had the capacity to deal with this free surface fluid flow problem. The simulated free surface shape was validated with experimental data available. The trend of the upper meniscus shape and dynamic contact angle developments at high drawing velocity was simulated. The results showed, as expected, that the dynamic contact angle would approach 180°with the increase of the fiber-drawing speed.
机译：如今，光纤在信息传输领域中起着越来越重要的作用。不断增长的需求使得有必要制造具有适当机械性能的高品质光导纤维，以承受在安装和操作过程中产生的应力。光纤涂层工艺提供了一层保护层，以保护纤维免受表面磨损，并增加纤维的拉伸强度。但是，在此过程中会遇到降低涂层质量的问题。主要问题之一是夹带空气，这可能导致偏心或涂层不完全。显然，研究该问题以改善涂层质量非常重要。已经对动态接触角，空气夹带速度及其与各种参数的相关性进行了许多实验研究，例如涂料的粘度和表面张力，拉丝速度等。然而，涂料流动如何影响上弯液面（与动态接触角和空气夹带直接相关）尚未深入研究。了解效果对于提高涂层质量至关重要。为了满足这一要求，目前的工作集中在研究上弯液面和拉丝速度之间的关系。这只是有关光纤涂覆过程的系列研究的第一部分。首先，开发了具有有限体积公式的数字代码。结果表明，该代码具有处理此自由表面流体流动问题的能力。模拟的自由表面形状已通过可用的实验数据进行了验证。模拟了在高拉伸速度下上弯液面的形状和动态接触角的变化趋势。结果表明，正如预期的那样，随着纤维拉伸速度的增加，动态接触角将接近180°。

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