Abstract: Pressure drop for flowing mixtures of sized sand particles in water through a vertical tubular leacher has been measured. When the particle size is between 60 and 80 mesh, the volume fraction of solid smaller than 0.175, and the velocity between 0.09 and 1.5m/s, the operation is stable. For different solid/liquid ratios, all experimental curves for pressure drop versus flowing velocity show minima, and the greater the solid/liquid ratio, the higher the flowing velocity at which the minimum occurs. The gravitational pressure drop for vertical tubes is given by △pg = △ε(ρs-ρf)gH. The difference in voidage between the up-and down-flow tubes may be calculated by equations for generalized fluidization, and is approximately equal to △ε= 2q/(1 + q)"+2R. The frictional pressure drop for vertical tubes may be calculated by treating the solid-liquid mixture as a continuum by other existing correlations.

摘要： 本文用单粒级的河砂与水作垂直管道浸取器的冷模试验.推导了浸取器直管段空隙率的关联式,提出了计算直管段压力降的模型,并分析了最小压力降下的操作流速.