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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigation on the liquid contact angle and its influence for liquid desiccant dehumidification system
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Investigation on the liquid contact angle and its influence for liquid desiccant dehumidification system

机译：液体干燥剂除湿系统中液体接触角及其影响的研究

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摘要

The liquid desiccant dehumidification system (LDDS) is promising by removing extra air moisture effectively with absorption. By significantly affecting the film wetted area, the desiccant contact angle of the liquid/air interface on the working plate is critical for the system performance. Its value accuracy also seriously impacts the prediction accuracy of theoretical models. However, previous research on the liquid desiccant contact angle was limited, and the results of current predictions were questionable. This paper tested the contact angle of commonly used desiccants, Lithium Chloride (LiCl) and Lithium Bromide (LiBr) aqueous solution, on the stainless steel plate, and developed empirical formulas for predicting the angle. For both desiccants, the contact angle increased with the solution mass concentration and decreased with temperature. With the increase of plate surface roughness, the angle first increased and then decreased. These parameters showed much obvious effects on the angle of LiCl. For the effect of roughness, the maximum changing rate of LiCl was 0.13°m compared with 0.07°m of LiBr. Errors between new formulas and experiment ones were acceptable, showing an average absolute error of 12.3% for LiCl and 9.4% for LiBr. Furthermore, the effects of contact angle on the film wetted area were investigated experimentally with a single channel regenerator. When the plate surface was hydrophilic, the initial film width was significantly enlarged, with a rate of -2.0 × 10~(-3)m per degree, and film contraction along the flow direction was restrained due to the small contact angle. So, the film wetted area increased with an average changing rate of -9.7 × 10~(-4)m~2 per degree, and the mass transfer was effectively enhanced by 2-3 times. Effective measures to reduce the contact angle were also proposed.
机译：液体干燥剂除湿系统（LDDS）有望通过吸收有效去除多余的空气水分。通过显着影响薄膜的润湿区域，工作板上液/气界面的干燥剂接触角对于系统性能至关重要。其值准确性也严重影响理论模型的预测准确性。但是，以前对液体干燥剂接触角的研究是有限的，目前的预测结果令人怀疑。本文测试了常用干燥剂氯化锂（LiCl）和溴化锂（LiBr）水溶液在不锈钢板上的接触角，并开发了预测该角的经验公式。对于两种干燥剂，接触角均随溶液质量浓度的增加而增加，随温度的降低而减小。随着板表面粗糙度的增加，角度先增大然后减小。这些参数对LiCl的角度显示出非常明显的影响。对于粗糙度的影响，LiCl的最大变化率为0.13°/ nm，而LiBr的最大变化率为0.07°/ nm。新配方和实验配方之间的误差是可以接受的，LiCl的平均绝对误差为12.3％，LiBr的平均绝对误差为9.4％。此外，用单通道再生器实验研究了接触角对膜润湿面积的影响。当板表面为亲水性时，初始膜宽度显着增大，比率为每度-2.0×10〜（-3）m，并且由于接触角小，沿流动方向的膜收缩受到抑制。因此，膜的润湿面积以每度-9.7×10〜（-4）m〜2的平均变化率增加，传质有效提高了2-3倍。还提出了减小接触角的有效措施。

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  • 来源
  • 作者

    Qi Ronghui; Lu Lin; Jiang Yu;

  • 作者单位

    Renewable Energy Research Group (RERC), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong,The Hong Kong Polytechnic University, Shenzhen Research Institute, Shenzhen, China;

    Renewable Energy Research Group (RERC), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong;

    Renewable Energy Research Group (RERC), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong;

  • 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
  • 中图分类
  • 关键词

    Contact angle; Liquid desiccant; Dehumidification system; Film area; Experiment;

    机译：接触角;液体干燥剂;除湿系统;电影区;实验;

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