流体动力作用对分层临界流速的影响

EFFECT OF HYDRODYNAMIC FORCE ON CRITICAL LAYERING FLOW VELOCITY

本文考虑上升水流的动力作用，对按重介质作用分层的临界条件重新进行推导，得出与小比重大颗粒雷诺数有关的临界流速公式。用煤和石英、煤和河砂的混合粒群进行了分层临界流速的测定，实例结果与计算值相当接近。对于实验所用的物料，给出了用均匀粒群干涉沉降速度公式的参数计算混合粒群临界流速的方法。

In consideration of upward current dynamic force, the authors rederived thecritical conditions under which mineral particles layer by the influence of heavy medium,giv-ing a critical flow velocity formula concerning Reynold' s number of large particles with asmall specific gravity, The critical flow velocity at which mixed particle groups,such as coal-quartz and coal-sand are layered,was measured,obtaining actual results approaching rela-tively calculated values. In the paper,the authors also gave some methods for calculating thecritical flow velocity using parameters of the formula of uniform particle groups disturbingsettling velocity.