Experimental Investigation of Water–Sand Mixed Fluid Initiation and Migration in Porous Skeleton during Water and Sand Inrush

Table 2

Critical Reynolds number of Aeolian sand and river sand particles under various axial stress.

Sample no.	Particle size (mm)	Critical Reynolds number,
		0 MPa	0.1 MPa	0.5 MPa	1.0 MPa	1.5 MPa	1.8 MPa
A1	0.075-0.15	0.1888	0.1987	0.2082	0.2135	0.2236	0.2390
A2	0.15-0.3	0.1028	0.1124	0.1182	0.1199	0.1261	0.1299
A3	0.3-0.6	0.0212	0.0227	0.0256	0.0373	0.0404	0.0475
A4	0.6-1.0	0.0015	0.0015	0.00157	0.00165	0.0017	0.00177
A5	1.0-2.0	1.5817^-4	2.3715^-4	3.1613^-4	5.5328^-4	6.3248^-4	7.1145^-4
A6	2.0-2.36	2.1960^-5	2.2044^-5	2.2629^-5	2.3965^-5	2.4700^-5	2.8975^-5