Excurrent jets of a set of model clams


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Excurrent jets of a set of model clams that are discharging into the near-wall region of a turbulent boundary layer in a laboratory flume. These false-color images were produced using planar laser-induced fluorescence and represent 16-s averages of dye concentration fields associated with the excurrent jets. Fluid that leaves the excurrent siphone is dyed to represent phytoplankton-depleted fluid, whereas the clear ambient fluid represents phytoplanktonrich fluid. This particular sequence of images shows how the speed of the crossflow affects the food-depleted (high dye concentration) boundary layer that develops over the bed of clams in two different ways—through its direct effect on the trajectories of the excurrent jets and through its effect on turbulent mixing of the jets.