作者: A. W. ROBERTS , M. G. JONES
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摘要: The problems associated with grain elevation and conveying under forced flow in vertical pipes are discussed. Based on experimental results, a theory is presented to describe varying degrees of air permeation up just beyond the fluidization point. takes into account boundary internal frictional properties, degree consolidation bulk granular material, stress fields that occur during flow. force elevate tube shown be composed two components, one overcome Coulomb friction initiate motion, other time-dependent component depends stiffness damping characteristics material. increases approximately exponentially column height due positive feedback effect shear stresses at pipe wall opposing motion. Air significantly reduce this by reducing both th...