THEORETICAL STUDY ON FLOW OF FRESH CONCRETE IN STRAIGHT PIPE

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  • KUROKAWA Yoshiyuki
    Dept. of Architecture, Graduate School of Engineering, Nagoya University
  • TANIGAWA Yasuo
    Dept. of Architecture, Graduate School of Engineering, Nagoya University
  • MORI Hiroshi
    Dept. of Architecture, Graduate School of Engineering, Nagoya University

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  • フレッシュコンクリートの直管内流動に関する理論的考察
  • フレッシュ コンクリート ノ チョクカンナイ リュウドウ ニ カンスル リロン

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Abstract

In the present paper, the flow of fresh concrete in straight pipe with laminar shear flow and slipping flow is considered. In the first section, the expression for slipping flow without deformation of material is obtained theoretically In the second section, the discussion is started from the Navier-Stokes's equation of motion for Newtonian fluid on the assumption that the material is incompressive. The equation expressing the gradient of pressure in straight pipe is obtained theoretically in the case with or without slipping at the inside surface of pipe. In the third section, the gradient of pressure is obtained approximately by using the parameters related to plug flow in the case with or without slipping for Bingham's fluid. Finally, the distribution of pressure, gradient of pressure, velocity ratio and plug flow ratio are obtained numerically, and the effects of various parameters are investigated.

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