free-draining

synonym: freely draining
https://doi.org/10.1351/goldbook.12254
Adjective describing the undisturbed flow of solvent through the domain of a dissolved macromolecule.
Note: Free-draining flow occurs in the limit of zero hydrodynamic interaction.
Source:
PAC, 2015, 87, 71. (Definitions of terms relating to individual macromolecules, macromolecular assemblies, polymer solutions, and amorphous bulk polymers (IUPAC Recommendations 2014)) on page 102 [Terms] [Paper]