About the Dependence of Breakthrough Curves on Flow Direction in Column Experiments of Transport across a Sharp Interface Separating Different Porous Materials

Table 4

Characteristics of the glass beads used for the experiments in two-layer media.

	Berkowitz et al. [1]		Villarreal [5] 1st phase		Villarreal [5] 2nd phase		Sternberg [4]		This paper column #1		This paper column #2
Flow rate (in mL/min)	0.3 to 1		0.3 to 3		0.3 to 3		2.2 to 5.4		0.003 to 0.27		0.054 to 0.27
Column length (in cm)	40		47		47		100		30		30
Inner column diameter (in cm)	2.7		3.18		3.18		3.2		0.9		0.9
	0.068		0.068		0.068		0.032		0.03		0.03
Grain type	F	C	F	C	F	C	F	C	F	C	F	C
Average grain diameter , (in mm)	1	4	1	4	0.25	1	0.163	0.595	0.09	0.35	0.25	1
Ratio between mean diameters of beads	4		4		4		3.6		3.9		4
Dispersivity (in mm)	1.3	9.6	N/A	N/A	N/A	N/A	0.035	0.175	0.75	0.42	0.42	1.24
	27	7	32	8	127	32	196	54	100	26	36	9
Peclet number (PeL)	0.77	0.42	N/A	N/A	N/A	N/A	4.6	3.4	0.12	0.83	0.60	0.81

F: fine; C: coarse.