食品科学 ›› 2003, Vol. 24 ›› Issue (10): 51-55.

• 基础研究 • 上一篇    下一篇

液—固两相食品混合物在垂直管流中单个颗粒速度分布的实验及理论研究

 杨自栋   

  1. 上海理工大学动力学院
  • 出版日期:2003-10-15 发布日期:2011-12-13

Experimental and Theoretic Study on Velocity Profiles of Single Particle Flows for Solid-Liquid Food in Vertical Pipes

 YANG  Zi-Dong   

  1. Power College,University of Shanghai for Science and Technology
  • Online:2003-10-15 Published:2011-12-13

摘要: 本文通过实验获得了单个颗粒在垂直管流中的速度分布。在实验中用数码录像方法对颗粒的轴向速度和径向位置进行了测量。考虑到非球形颗粒和羧甲基纤维素(CMC)溶液的非牛顿性,对有关文献中颗粒阻力系数计算的关系式做了修正,理论计算结果与和实验滑移速度比较表明,在靠近管道轴线的径向位置模型的计算与实验结果很接近。本文还讨论了颗粒尺寸和流体流量对颗粒速度分布的影响。

关键词: 颗粒, 食品加工, 液固两相流, 滑移速度

Abstract: The present paper describe experimental results on particle velocity profiles obtained for single particle flows ofsolid-liguid through vertical pipes(up-flow).A video recording technique has been used to determine both the particle axial velocityand the radial position of the particles.And the slip velocity for single particles has been compared with predicted values byusing literature correlations modified to take into account the non-spherical shape of the particles and the non-Newtonianbehaviour of the CMC solutions.The predicted values were in general very close to experimental values.The effects of flow rateand particle size on the particle velocity profiles were also discussed in this paper.

Key words: particle, food processing, solid-liquid flow, slip velocity