Capillary flow of a suspension in the presence of discontinuous shear thickening

The rheology of suspensions showing discontinuous shear thickening (DST) is well documented in conventional rheometer with rotating tools, but their study capillary flow still lacking. We present results obtained a homemade working an imposed pressure regime. show that the shape experimental curve giving volume rate versus wall stress can be qualitatively reproduced from rotational geometry at instead sharp decrease observed critical stress, this transposition predicts progressive rate. Wyart-Cates theory used to reproduce stress-shear and then applied predict pressure. theoretical total stop high whereas experimentally it remains constant. propose modification which, by taking into account relaxation frictional contacts absence rate, behavior. also hypothesized DST transition propagates immediately inside capillary, once has reached its value: $\tau_R=\tau_c$, even if internal $\tau(r<R)$ below one. In way whole modified W-C model.