Pressure Losses Across Sequential Stenoses in Collapsible Tubingby Maria Siebes, Univ of Iowa, Iowa City, United States,
Binu John, Univ of Iowa, Iowa City, United States,
Abstract: The fluid dynamics of a model of a diseased artery with multiple stenoses were investigated in a recirculating steady-flow system over a range of Reynolds numbers (Re) from 30 to 1100. Pressure losses were measured across two sequential stenosis models in flexible tubing, a partially compliant upstream one (severe) and a rigid downstream one (mild or severe). The distance (S) between the two stenoses was varied from 1 to 6 times the unobstructed diameter (D). With water as the operating fluid, the set with the severe downstream stenosis caused less overall pressure loss than that with the mild downstream stenosis at all distances. With a glycerin mixture, this was true at S/D<2, and the pressure drop across the sequential stenoses was less than that across the compliant stenosis alone. In all cases an increase in pressure drop with unchanged or even decreasing flow indicated partial collapse of the upstream stenosis. The Re at which this collapse occurred depended on the configuration of the stenoses and the kinematic viscosity of the perfusing fluid.
Subject Headings: Rivers and streams | Dynamic models | Mathematical models | Steady flow | Reynolds number | Pressure measurement | Water pressure
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