Outline of Mesoscopic Fluid Mechanics

An Order Conservation System has been put forward in this paper, it consists of 5 Principles on streamline (dynamics). Each streamline has 2 pairs of τ surface and 4 edges (square section). Principle 1: In the flowfield every streamline preserves its own fluid lumps, and their mutual order remains unchanged; Principle 2: In shear flow the energy level order (ELO) of every streamline remains unchanged; Principle 3: In shear flow, if a fluid line preserves its lumps all the way, then it must be a streamline; Principle 4: The τ surface remains the τ surface, the edge of streamline remains the edge of streamline, the continuity of τ along the edge and the discontinuity of τ across the edge remain unchanged; Principle 5: The evolution trend of friction style between two streamlines from sliding to wriggling to rolling can not be reversed.