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Fluorescent particle pathlines within the upstream and downstream sections of the pump (inset) under steady conditions. At the nominal flow rate of 4.5 lpm the pathlines near the upstream bearing (a) are generally aligned and coherent. Below 3.8 lpm, secondary flow disturbances become evident (b) shown here for 3.0 lpm. Pathlines in the aft stator (c) and (d) are consistently chaotic for all flow rates studied (from 1.0 to 6.0 lpm.)
