Abstract
A theory is presented relating the pressure difference across a stenosed valve to the flow through it. In aortic stenosis the sudden expansion in flow cross-section distal to the cusps results in a turbulent mixing region driven by the high velocity jet formed in the valve. As the flow decelerates spatially there is some recovery of pressure along the aorta and prediction of this pressure increase is included in the theory. Expressions are also derived for the loss of energy both within the valve and in the turbulent mixing region. Steady flow model experiments are described in which several nozzle designs were used to represent different stenosis shapes. Nozzle discharge coefficients were determined and the pressure recovery was measured and agreed well with calculated values.
Published Version
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