Viscous drag and energy transfer of pulsatile flow in large arteries

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Abstract
Early results of simultaneous measurement of pressure gradient and flow in the thoracic aorta of the dog during systole are used in calculations of viscous drag and energy transfer of actual pulsatile flow. Viscous drag is large when the flow is small, and small when the flow is large, so that almost all the energy of the pulse wave is transmitted along the vessel. The amplitude of the viscous drag is a much greater fraction of the amplitude of the pressure gradient than is predicted by the Navier-Stokes equation, which is only theoretical and may assume an unrealistic form of viscous drag during pulsatile flow.

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