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首页> 外文会议>4th International Conference on Nanochannels, Microchannels and Minichannels 2006(ICNMM2006) pt.B >TURBULENT FLOW IN A MICRO-CHANNEL
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TURBULENT FLOW IN A MICRO-CHANNEL

机译：微通道中的湍流

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摘要

Turbulent flow of water in a narrow gap of an emulsifier is investigated experimentally using micro-PIV (micro Particle Image Velocimetry) technique and compared with numerical predictions performed using the commercial code Fluent. The purpose of the investigations is to develop a procedure for well-controlled generation of mono-disperse suspension of micro droplets. These droplets will form a matrix for collection of nano-particles into well-structured configuration. The micro-flow measurements are based on epi-fluorescence illumination and high-speed imaging. The experimental data are compared with the numerical results obtained using both turbulent and laminar flow models. It was found that, due to small channel dimensions and very small flow development length, the turbulent energy dissipation takes place mainly in the gap and shortly behind it. Very low amount of oil-phase fraction in investigated emulsions justifies us to use mean energy dissipation estimated for pure water to predict mean diameter of oil droplets. These predictions are validated using experimental data for the emulsion.
机译：使用micro-PIV（微颗粒图像测速）技术对乳化剂狭窄间隙中水的湍流进行了实验研究，并将其与使用商业代码Fluent进行的数值预测进行了比较。研究的目的是开发一种程序，用于很好地控制微滴的单分散悬浮液的产生。这些液滴将形成一个矩阵，用于将纳米粒子收集为结构良好的配置。微流量测量基于落射荧光照明和高速成像。将实验数据与使用湍流和层流模型获得的数值结果进行比较。已经发现，由于通道尺寸小和流动发展长度非常小，湍流的能量耗散主要发生在缝隙中以及紧随其后的缝隙中。研究的乳液中极少的油相分数证明我们可以使用估计的纯水平均能量耗散来预测油滴的平均直径。使用乳液的实验数据验证了这些预测。

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