![]() Treating a fluid in the laminar flow regime as a series of parallel layers, shear stress is the tangential force required to move one horizontal plane, with respect to its neighbour, at constant velocity. The velocity at which the transition between laminar and turbulent flow occurs is related to viscosity. At high fluid velocities, eddy currents are formed which lead to random mixing throughout the flow cross-section. What is laminar flow?Īt low velocities, fluids flow through pipes in a regular manner with no vertical mixing across the wave front. The definition of viscosity is based on laminar, non-turbulent, flow. This can be complex as viscosity can be affected by temperature, pumping speed, pipe dimensions, and, with some fluids, it may also change over time. Viscosity is a measure of a fluid’s resistance to flow, a property that affects how it will behave in a pump and in pipework. Terms Associated with Viscosity and Shear What is Viscosity? ![]()
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