b'SPRAY TRANSFER EFFICIENCIESFigure 4. Thickness of the boundary layer for each manipulation setup.Figure 5. Momentum thickness ((x)) of the boundary layer for each manipulation setup.where UC represented the conveyorconstant across both measurementand knife-edge with 3.175 and 6.35 velocity of 10.56 m/s, representsregions and is approximately 22.5mm gap sizes (low-purple and high-the wall-normal location wheremm. The blow-off nozzle (blue)green) each demonstrate a reduced the streamwise velocity reachesdemonstrates a significant increaseboundary layer thickness in theThe baseline 5% of the conveyor speed; at ain the boundary layer thickness withdownstream region to 15.8, 12.8 and(black) given x location. The boundaryan increase of 62%. The cylinder16.0 mm, or 30%, 43%, and 29%result layer thickness provides a directwas examined with 3.175 and 6.35reductions, respectively. demonstrates indicator of the effect of eachmm gap below the cylinder (low- In order to process the results intothat the boundary layer manipulationred and high-orange, respectively),a more robust, and perhaps moreboundary method. In Figure 4, the boundaryand both cases show an initialinstructive metric, the momentumlayer layer thickness is provided acrossboundary layer growth as the flowthickness, thickness both PIV measurement regions forbends around the top-side of theis fairly the baseline and all manipulationcylinder, with the boundary layerconstant arrangements. The baseline (black)slowly recovering in the spray regionis calculated and presented in Figureacross both result demonstrates that theto a similar thickness as the baseline5 for all test cases. Momentummeasurement boundary layer thickness is fairlycase. Finally, the blunt plate (cyan)thickness is the preferable metric forregions78 WORLD PULP&PAPER'