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Experimental and Theoretical Analysis of the Impinging Stream Drying

HUAI Xiulan; LIU Dengying; SHIGERU Koyama   

  1. Institute of Advanced Material Study,Kyushu University,Kasuga-koen 6-1,Kasuga-shi,Fukuoka
    816-8580,Japan
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-02-28 Published:2003-02-28
  • Contact: HUAI Xiulan

对撞流干燥的实验与理论研究

淮秀兰; 刘登瀛; SHIGERU Koyama; BIDYUT Baran Saha   

  1. Institute of Advanced Material Study,Kyushu University,Kasuga-koen 6-1,Kasuga-shi,Fukuoka
    816-8580,Japan
  • 通讯作者: 淮秀兰

Abstract: The experiments of one-stage semi-circular and two-stage semi-circular impinging stream
drying as wellas the vertical and semi-circular combined impinging stream drying were
carried out. The velocity distribution andthe mean residence time of particles, and the
influence of various factors on drying characteristics were studied. Amathematical model of
granular material drying in a semi-circular impinging stream dryer was proposed, in
whichthe flow characteristics as well as the heat and mass transfer mechanisms were
considered. Reasonable numericalmethods were used to solve the equations. Under various
conditions, the calculated results agree well with theexperimental data. The unsteady-state
drying dynamic equation, as well as the variations of drying rate andmoisture content
versus time were obtained. The results indicate that constant drying rate period does not
existin a semi-circular impinging stream dryer. Appropriate semi-circular stage number and
curvature radius, flow-rateratio, air velocity, and higher inlet air temperature should be
used for enhancing the drying process.


Key words: impinging stream drying, flow characteristics, drying characteristics, mathematical model

摘要: The experiments of one-stage semi-circular and two-stage semi-circular impinging stream
drying as wellas the vertical and semi-circular combined impinging stream drying were
carried out. The velocity distribution andthe mean residence time of particles, and the
influence of various factors on drying characteristics were studied. Amathematical model of
granular material drying in a semi-circular impinging stream dryer was proposed, in
whichthe flow characteristics as well as the heat and mass transfer mechanisms were
considered. Reasonable numericalmethods were used to solve the equations. Under various
conditions, the calculated results agree well with theexperimental data. The unsteady-state
drying dynamic equation, as well as the variations of drying rate andmoisture content
versus time were obtained. The results indicate that constant drying rate period does not
existin a semi-circular impinging stream dryer. Appropriate semi-circular stage number and
curvature radius, flow-rateratio, air velocity, and higher inlet air temperature should be
used for enhancing the drying process.


关键词: impinging stream drying;flow characteristics;drying characteristics;mathematical model