An elongated conduit can be used for mixing and/or shearing a fluid. The elongated conduit can be configured as a repeating sinusoidal wave in a two-dimensional plane that is sufficient to restrict a line of sight down the length of the conduit. A method for mixing or shearing a fluid can include injecting the fluid at a high velocity into an end of a length of such a baffle-less conduit. Although a number of fluids can be effectively treated, disengagement of bitumen from the solids of oil sands ore and further treatment of bitumen products from other oil sands separation processes can be readily achieved.