Experimental study on enhancement of drying efficiency of organic solvent using ionic wind

이온풍을 이용한 유기용매의 건조 효율 향상에 관한 실험적 연구

  • Lee, Jae Won (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Sohn, Dong Kee (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Ko, Han Seo (School of Mechanical Engineering, Sungkyunkwan University)
  • Received : 2019.04.08
  • Accepted : 2019.04.22
  • Published : 2019.04.30


'Ionic wind' is phenomenon induced by corona discharge which occurs when large electric potential is applied to electrodes with high curvature. The ionic wind has advantage that it could generate forced convective flow without any external energy like separate pump. In this study, 'pin-mesh' arrangement is utilized for experiments. First, optimization of configuration is conducted with local momentum of ionic wind behind the mesh. Empirical equation for prediction about velocity profile was derived using the measured results. Secondly, the enhancement of mass transfer rate of acetone with ionic wind was analyzed. Also, the drying efficiency using a fan which has same flow rate was compared with ionic wind for identification of additional chemical reaction. At last, the drying process of organic solvent was visualized with image processing. As a result, it was shown that the use of ionic wind could dry organic matter four times faster than the natural condition.

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Fig. 1. Experimental setup for measurements of velocity of ionic wind

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Fig. 2. Schematic of mockup with located electrodes

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Fig. 3. Mesh electrodes with various hole diameters

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Fig. 4. Measurement method for reduction of intensity by time; a) Before use of MTC and b) After use of MTC

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Fig. 5. Procedure of image processing for drying efficiency; a) Photographed images during experiment, b) Histogram analysis for binarization and c) Counting pixels in binarized images

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Fig. 6. Comparison between measured velocity and empirical model according to electric potential for a) 6kV, b) 7kV, c) 8kV, d) 9kV and e) 10kV

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Fig. 7. Comparison between measured velocity and empirical model according to hole diameter for a) 6mm, b) 10mm and c) 16mm

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Fig. 8. Schematic of electric field and magnitude of velocity of ionic wind for a) D = 6mm and b) D = 16mm

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Fig. 9. Reduction of acetone mass by time with and without ionic wind for various contact diameters

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Fig. 10. Electric efficiency for different contact area with ionic wind and fan

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Fig. 11. Reduction of normalized reflected intensity according to time with and without ionic wind

Table 1. Maximum velocity of ionic wind and empirical constant for various hole diameters of mesh

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Supported by : 한국연구재단


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