Abstract
The mean flow rate in a channel remains constant for a given mean pressure gradient for pulsating and stationary flows of a Newtonian liquid. Theory and measurements on nonlinear viscous [1-4] and nonlinear viscoelastic [5-13] liquids in the 1970s and 1980s showed that pressure-gradient pulsations can increase the flow rate, and if the increase is fairly large, flow pulsation can be a way of raising the throughput. However, this is attained at the expense of increasing the power consumed in pumping the liquid.
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