A Bernoulli pad uses an axial jet to produce radial outflow between the pad and a proximally located parallel surface. The flow field produces a force between the surfaces, which depends upon their spacing h. The direction of this force is repulsive as h approaches zero and becomes attractive as h increases. This yields a stable equilibrium point heq, where the force is equal to zero. The present computational work indicates that a power-law relationship exists between heq and the inlet fluid power required to sustain this equilibrium spacing when each is appropriately scaled. This scaling is derived principally from the wall shear; an additional term incorporating the inlet Reynolds number is used to account for the force applied to the system. The relationship is valid over a range of forces acting on the system, geometric, and material properties.
Power Scaling of Radial Outflow: Bernoulli Pads in Equilibrium
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 28, 2018; final manuscript received February 28, 2019; published online April 15, 2019. Assoc. Editor: Ioannis K. Nikolos.This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions.
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Kamensky, K. M., Hellum, A. M., and Mukherjee, R. (April 15, 2019). "Power Scaling of Radial Outflow: Bernoulli Pads in Equilibrium." ASME. J. Fluids Eng. October 2019; 141(10): 101201. https://doi.org/10.1115/1.4043061
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