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Evaporation of single component viscous liquids in a metal falling film evaporator

机译：金属降膜式蒸发器中单组分粘性液体的蒸发

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摘要

Heat transfer for single component falling film evaporation has been investigated in a stainless steel single tube falling film evaporator. The tube had a heated length of 2,500 mm. Propylene glycol and cyclohexanol have been used as evaporating media. Liquid film running down the tube, is formed on the inner side of the tube. For the distribution of liquid two different devices were examined. Process equipment was operated in pump-around mode with the distillate being condensed and recycled. Results show that none of the available correlations for heat transfer in falling film evaporation is able to describe the results qualitatively as well as quantitatively. Using different film distribution devices, a significant influence of the Reynolds number for the transition from laminar to turbulent flow is seen. However, differences between experimental results and correlations in literature cannot be explained only by usage of different film distributions, in particular when the correlation is based on measurements with a different tube length. A model approach is presented for cyclohexanol as evaporating medium with a flat weir as film distributor.
机译：已经在不锈钢单管降膜蒸发器中研究了单组分降膜蒸发的热传递。该管的加热长度为2500mm。丙二醇和环己醇已被用作蒸发介质。沿管子向下流动的液膜形成在管子的内侧。为了分配液体，检查了两种不同的装置。处理设备以泵送方式运行，馏出物经过冷凝和再循环。结果表明，降膜蒸发中传热的可用相关性均无法定性和定量地描述结果。使用不同的薄膜分配装置，可以看到雷诺数对从层流到湍流过渡的重大影响。然而，实验结果和文献中的相关性之间的差异不能仅通过使用不同的薄膜分布来解释，特别是当相关性基于具有不同管长的测量值时。提出了一种模型方法，以环己醇作为蒸发介质，带有平坦堰作为薄膜分配器。

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  • 来源
    《Heat and mass transfer》 |2011年第8期|p.963-971|共9页
  • 作者

    Stefanie Arndt; Stephan Scholl;

  • 作者单位

    Institut fur Chemische und Thermische Verfahrenstechnik,Technische Universitat Braunschweig, Braunschweig, Germany;

    Institut fur Chemische und Thermische Verfahrenstechnik,Technische Universitat Braunschweig, Braunschweig, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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