Experimental researches were carried out on a slurry transportation system to investigate rheological properties and effects of wall slip behavior on flow properties of coke/water slurry flowing in pipes with different diameters.A numerical technique based on Tikhonov regularization was used to determine rheological properties and slip velocity.The results suggested that when coke concentration was 59.8%

coke/water slurry changed from pseudo plastic fluid to dilatant fluid with the increase of shear rate.Then the slurry became dilatant fluid completely with increasing concentration.While coke concentration came up to 63.4%

coke/water slurry changed from dilatant fluid back to pseudo plastic fluid.Rate of slip velocity change with shear stress depended on rheological properties of coke/water slurry.When coke/water slurry was dilatant fluid

the rate of slip velocity change increased sharply with shear stress.But there was no pronounced change with the rate of slip velocity change of pseudo plastic fluid.The change of slippage contribution lagged behind the change of rheological properties.