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Effect of compressibility on bubbly cavitating flows

Journal of Hydrodynamics 2020年第1期32卷 1-5页

作者： Harish Ganesh Anubhav Bhatt Juliana Wu steven ceccio Department of Naval Architecture and Marine Engineering University of MichiganAnn ArborMichiganUSA

Cavitating bubbly flows can form in separated flows and shear layers leading to local regions high vapor void fraction,and these flows often exhibit periodic shedding of vaporous ***,the presence of a liquid re-entrant flow,driven by the kinematics of liquid flow stagnation,has been identified as an important mechanism leading to cavity ***,high local vapor void fractions can also result in a reduced mixture speed of sound and a possible supersonic *** recent findings on different geometries indicate that propagating bubbly shocks in these flows are a primary mechanism of flow *** this study,we discuss the effect of compressibility on four geometries,mainly in the generation of propagating bubbly shocks that can influence the cavitation shedding *** order to elucidate the differences and similarities of the observed cavitation dynamics,and the influence of compressibility,we report observations from a backward facing step,backward facing wedge,NACA0015 hydrofoil,and a bluff body with a wedge cross section.

关键词： Cavitation bubbly shocks compressible vapor-liquid flows

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Bubbly shock propagation as a mechanism of shedding in separated cavitating flows

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Journal of Hydrodynamics 2017年第6期29卷 907-916页

作者： Harish Ganesh Simo A.Makiharju steven L.ceccio University of Michigan Ann ArborUSA University of California BerkeleyUSA

Stable attached partial cavitation in separated flows can transition to cloud shedding, and the mechanism of transition has been attributed to the presence of a re-entrant liquid jet. Our findings have revealed the presence of propagating bubbly shock waves as an alternative dominant mechanism of shedding when the compressibility of the bubbly mixture is appreciable. In the present paper, we discuss dynamics associated with these bubbly shock waves, interaction of shock waves with obstacles in their path, and means to manipulate their properties to control the shedding process by non-condensable gas injection.

关键词： Partial cavitation bubbly shock waves cloud cavitation X-ray densitometry

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Super-hydrophobic Surface for Skin Friction Drag Reduction in High Reynolds Number Turbulent Flow

Super-hydrophobic Surface for Skin Friction Drag Reduction i...

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第十届全国流体力学学术会议

作者： steven L ceccio University of Michigan

Since Onda et al.(1996) reported the development of super-hydrophobic surfaces(SHS) with a fractal topology,there has been significant world-wide activity in research related to the physics,material science,and manufacture of a wide variety of SHS’*** undergoing laminar flow over SHS’s may develop a Cassie-Baxter state at the flow boundary,and the presence of the gas pockets between rough surface asperities leads to a reduction in the shear stress compared to that of a smooth solid boundary,especially in flow channels where the slip length is on the order of the channel dimension(***-fluidic devices).Yet,SHS’s influence on fully developed turbulent boundary layers(TBL) is *** order to develop SHS’s that will reduce skin friction drag at high Reynolds numbers(Re>10),our multi-university research group conducted a five-year effort focusing on five areas:(1) creation of optimized SHS’s for high Reynolds numberWe will develop methodologies to manufacture specific SHS’s with the desired surface energy,topology for the experimental examination of TBL modification at high Reynolds numbers;(2) examination of the interaction of near-wall flows with micro-scale surface gas pockets;(3) examination of the turbulence modification of micro-structured SHS’s by TBL flow;(4) development of SHSs for passive and active gas replenishment to develop and maintain the Cassie-Baxter condition;and(5) experimental validation of SHS drag reduction at high Reynolds *** talk will present an overall summary of the efforts results and conclusions.

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