Coal water slurry (CWS) with high mass concentration, as a kind of uniform suspension, has the property of non - Newtonian fluid, and there is a slip phenomenon when it flows in pipe. The similitude criterion, known as general Reynolds number Reg which can characterize the state of CWS flow in pipe, was put forward on the basis of analyzing the flow of the slip layer of CWS in pipe. The results show Reg holds good not only for the slip flow of CWS with the properties of general Bingham or Bingham fluid,but ...