Effect of the initial solute concentration on the flow pattern inside an evaporating polymer solution droplet on a substrate

Masayuki Kaneda, Hirotaka Ishizuka, Kentarou Hyakuta, Jun Fukai

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

The internal flow of an evaporating polymer solution droplet on a substrate is experimentally studied. The flow visualization is carried out. The effect of the initial polymer concentration is further investigated. A polystyrene-acetophenone (PS-Ap) and a polystyrene-anisole (PS-Ani) solution are employed as the droplet. A nylon powder is mixed with the droplet for the visualization by a YAG-laser sheet light. The droplet evaporates after the settlement on the substrate. Without the polymer dissolved in the solvent, complicated flow is observed in both droplets. For the cases with dissolved polymer, the flow pattern is rectified. In the PS-Ap droplet, the source flow is observed for the initial solute mass fraction c0 = 0.005 - 0.20. This convection becomes strong as c0 increases. The mechanism of the flow inside the PS-Ap droplet can be understood by the combination of the natural convection and Marangoni convection due to the differences of the temperature and the solute concentration. As for the PS-Ani droplet, the evaporation process and the flow pattern are affected by c0. For the dilute solution (0 < c0 < 0.03), the contact angle decreases during the contact line receding. The observed flow pattern becomes similar to that in the PS-Ap droplet. At c0 = 0.08 - 0.2, the decline of the contact angle is remarkable and the direction of the internal flow becomes inverse. This flow mechanism cannot be clarified, but it may have the relations with the decreasing contact angle.

本文言語英語
ホスト出版物のタイトル2007 Proceedings of the ASME/JSME Thermal Engineering Summer Heat Transfer Conference - HT 2007
出版社American Society of Mechanical Engineers (ASME)
ページ1091-1097
ページ数7
ISBN(印刷版)0791842746, 9780791842744
DOI
出版ステータス出版済み - 1 1 2007
イベント2007 ASME/JSME Thermal Engineering Summer Heat Transfer Conference, HT 2007 - Vancouver, BC, カナダ
継続期間: 7 8 20077 12 2007

出版物シリーズ

名前2007 Proceedings of the ASME/JSME Thermal Engineering Summer Heat Transfer Conference - HT 2007
1

その他

その他2007 ASME/JSME Thermal Engineering Summer Heat Transfer Conference, HT 2007
国/地域カナダ
CityVancouver, BC
Period7/8/077/12/07

All Science Journal Classification (ASJC) codes

  • 管理、モニタリング、政策と法律
  • 燃料技術
  • 再生可能エネルギー、持続可能性、環境
  • エネルギー(全般)
  • 電子工学および電気工学
  • 機械工学
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • モデリングとシミュレーション

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