Wall Shear Stress Generated by a Bernoulli Pad: Experiments and Numerical Simulations
Anshul S. Tomar, Shaede Perzanowski, Ricardo Mejia-Alvarez, Ranjan Mukherjee, Aren M. Hellum, Kristina M. Kamensky
Published: 2024/4/23
Abstract
Bernoulli pads generate locally large wall shear stresses on workpieces, which can be used for cleaning, but may also damage delicate surfaces. This work presents direct measurements of the wall shear stress using constant temperature anemometry for the first time. A hot-film sensor was calibrated in the laminar and turbulent flow regimes using a purpose-built water flow channel. The calibrated sensor was then flush-mounted onto a smooth surface and a Bernoulli pad was traversed over the sensor and wall shear stress data were acquired. Numerical simulations of the flow field were also performed; they accurately predicted the maximum shear stress near the jet corner but over-predicted at large radii.