ON TORTUOSITY AND AREOSITY TENSORS FOR POROUS-MEDIA

An average streamwise channel velocity is proposed as a more accurate representation of the actual intrapore velocity than the intrinsic pha se average velocity. A relationship is derived between the average str eamwise channel velocity and the interstitial velocity and superficial velocity. New definitions of tortuosity and areosity as second-order tensors are proposed for porous media in general. Novel names, semanti cally in line with the respective physical meanings, ate proposed for these quantities. The definitions produce results which conform with s everal other published results and are applicable to anisotropic media in general.