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A new method for determining diffusion and convection mass transfer coefficients in the dyeing of textile materials.

机译：确定纺织材料染色中扩散和对流传质系数的新方法。

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摘要

This research establishes a new method of determining the diffusion coefficient, while including the boundary layer effects, for a nylon film dyed with a disperse dye. A laser scanning confocal microscope (LSCM) is used to quantitatively measure the amount of dye at each position through the film. Although the LSCM measures fluorescence intensity, the nylon 6,6 film is dyed with a dye that is not traditionally considered a fluorescent dye. This technique uses real dyes (not model dyes) at industrially relevant concentrations. Corrections have to be made for laser intensity because a large fraction of the laser beam is absorbed as it passes through the film. The data are then modeled using known mass transfer relationships to simultaneously obtain DAB and the ratio of /Khm . Since K is measured in a separate experiment, all three mass transfer parameters are then determined. The model assumes that dye diffusion through the film is one-dimensional, diffusion coefficient and total molar concentration are constant for this process, and there is no mass generation in the film. The model was demonstrated using a stirred dyebath. Three stirring rates were used, 100 rpm, 50 rpm, and 0 rpm.; This new method was compared to the technique that has been used in the past. The traditional method involves destroying the sample for spectrophotometric analysis, but the new method using the LSCM data does not require destroying the sample. The LSCM is also much faster than spectrophotometric analysis. The two methods give values of DAB that are close (1.51 × 10 −13 m2/s ± 0.20 × 10−13 m2/s and 3.24 × 10−13 m 2/s ± 0.19 × 10−13 m2/s respectively). The uncertainty in the measurement of DAB and Bi is much larger for method 1 than method 2. Consequently, method 1 did not give reliable values for hm for the data generated in this thesis research, but changes in hm could be detected with method 2.
机译：这项研究建立了一种新的测定扩散系数的方法，该方法包括用分散染料染色的尼龙膜，同时包括边界层效应。激光扫描共聚焦显微镜（LSCM）用于定量测量薄膜整个位置上的染料量。尽管LSCM可以测量荧光强度，但尼龙6,6膜是用传统上不认为是荧光染料的染料染色的。该技术使用工业上相关浓度的真实染料（不是模型染料）。必须对激光强度进行校正，因为很大一部分激光束在穿过薄膜时会被吸收。然后使用已知的传质关系对数据进行建模，以同时获得D AB 和 / K h m 。由于K是在单独的实验中测量的，因此将确定所有三个传质参数。该模型假设染料在膜中的扩散是一维的，扩散系数和总摩尔浓度在此过程中是恒定的，并且在膜中不会产生质量。使用搅拌的染浴证明了该模型。使用三种搅拌速率：100rpm，50rpm和0rpm。将该新方法与过去使用的技术进行了比较。传统方法涉及销毁样品以进行分光光度分析，但是使用LSCM数据的新方法不需要销毁样品。 LSCM还比分光光度分析快得多。两种方法给出的DAB值接近（1.51×10 -13 m 2 / s±0.20×10 −13 m 2 / s和3.24×10 −13 m 2 / s±0.19×10 −13 m 2 / s）。方法1的D AB 和Bi的测量不确定度比方法2大得多。因此，对于生成的数据，方法1没有给出h m 的可靠值在本文研究中，但是方法2可以检测到h m 的变化。

著录项

  • 作者

    McFarland, Elizabeth Gramling.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Textile Technology.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 轻工业、手工业;
  • 关键词

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