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The viscous interaction of fluid is understood as the response todeformation, which is proportional to the strain rate. This model has graduallybecome the standard since Stokes, and has become the basis of the classicalflow theory, namely the Navier-Stokes (N-S) equations. However, it has neverbeen accurately verified in the curved laminar flow. Here, a distinctiveunambiguous simple experiment is designed to falsify the viscosity model ofdeformation, and instead a new model is proposed, that is, the viscous frictionoriginates from the slip of fluid layering at molecular scale. Though Newtoncontributed the initial idea of slip viscosity, the new model cannot beformulated without the help of modern differential geometry. From the newmodel, the analytical solution of laminar Taylor-Couette (T-C) flow between twoconcentric cylinders can reproduce the result of the ideal experiment proposedby Newton as the outer cylinder being infinite, which was once considered amistake of Newton. A significant difference with the solution of the N-Sequations when the outer cylinder is relatively large can be used todistinguish the viscosity models, even for the simplest case with bothcylinders rotating with the same angular velocity. The accurate measurementdata by the LDA support the slip model, and the consequent flow theoryinevitably leads to a new vision in turbulence research.

Newton saw the truth -- on the nature of fluid flow and viscous interaction