QUANTITATIVE VISUALIZATION OF A SUBMERGED PSEUDOPLASTIC JET USING PARTICLE IMAGE VELOCIMETRY

A preliminary experimental study of a pseudoplastic jet flow is report ed in this paper. The velocity field was measured using Particle Image Velocimetry. Unlike a Newtonian jet, the pseudoplastic jet was observ ed to experience a sudden drop in its velocity at a reproducible posit ion downstream of the nozzle for the range of velocities examined. Thi s position moved downstream with an increase in the nozzle exit veloci ty. The center-line streamwise velocity decayed as X(-15) to X(-30) wi thin the terminating region of the jet for three different nozzle exit velocities of 2.43, 3.17, and 5.42 m/s. This decay is in contrast of X(-1) decay for a turbulent or laminar Newtonian jet. The location of the terminating region did not appear to scale with Reynolds number, P lasticity number, or Hedstrom number. At Reynolds number condition. Cl ose observation of the jet indicated that local turbulence could exist within regions of high shear rate. Further detailed study is required to confirm this observation.