@article {stoehr2003a,
	title = {Measurement of 3D pore-scale flow in index-matched porous media},
	journal = {Exp. Fluids},
	volume = {35},
	number = {2},
	year = {2003},
	pages = {159--166},
	abstract = {We present the experimental analysis of fluid flow at the pore-scale of a transparent porous medium with matched refractive indices of the solid and liquid phases. The planar laser-induced fluorescence (PLIF) technique described is the first to simultaneously visualize the 3D pore-scale flow of two immiscible liquid phases in porous media. Through the application of a highly precise index matching method and the employment of up-to-date CCD imaging hardware, the system features a high spatial resolution and sampling rate. The method was used to study the dispersion of a tracer dye in single-phase flow and the displacement of oil by water in an imbibition process.},
	issn = {0723-4864},
	doi = {10.1007/s00348-003-0641-x},
	author = {M. St{\"o}hr and Roth, K. and Bernd J{\"a}hne}
}
