Fracture phenomena in shearing flow of viscous liquids

Archer, Lynden A.; Ternet, Dennis; Larson, Ronald G.

doi:10.1007/s003970050072

Cited by 7 publications

(8 citation statements)

References 5 publications

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“…Experiments of this kind ought to be tried. Cavities formed in shear flows have been reported recently in a paper by Archer, Ternet & Larson (1997). They note that '.…”

Section: Cavitation In Shearmentioning

confidence: 85%

Cavitation and the state of stress in a flowing liquid

1998

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The problem of the inception of cavitation is formulated in terms of a comparison of the breaking strength or cavitation threshold at each point in a liquid sample with the principal stresses there. A criterion of maximum tension is proposed which unifies the theory of cavitation, the theory of maximum tensile strength of liquid filaments and the theory of fracture of amorphous solids. Liquids at atmospheric pressure which cannot withstand tension will cavitate when and where tensile stresses due to motion exceed one atmosphere. A cavity will open in the direction of the maximum tensile stress which is 45° from the plane of shearing in pure shear of a Newtonian fluid. Experiments which support these ideas are discussed and some new experiments are proposed.

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“…Experiments of this kind ought to be tried. Cavities formed in shear flows have been reported recently in a paper by Archer, Ternet & Larson (1997). They note that '.…”

Section: Cavitation In Shearmentioning

confidence: 85%

Cavitation and the state of stress in a flowing liquid

1998

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“…This magnitude may represent the amount of tension that this liquid can resist without the opening of a cavity. Archer, Ternet & Larson (1997) visualized the opening of bubbles within a sample of low-molecular-weight polystyrene subjected to start-up of steady shearing flow. They noticed that bubbles seemed to appear near dust particles.…”

Section: Cavitation Thresholdmentioning

confidence: 99%

Stress-induced cavitation for the streaming motion of a viscous liquid past a sphere

et al. 2007

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The theory of stress-induced cavitation is applied here to the problem of cavitation of a viscous liquid in the streaming flow past a stationary sphere. This theory is a revision of the pressure theory which states that a flowing liquid will cavitate when and where the pressure drops below a cavitation threshold, or breaking strength, of the liquid. In the theory of stress-induced cavitation the liquid will cavitate when and where the maximum tensile stress exceeds the breaking strength of the liquid. For example, liquids at atmospheric pressure which cannot withstand tension will cavitate when and where additive tensile stresses due to motion exceed one atmosphere. A cavity will open in the direction of the maximum tensile stress, which is 45° from the plane of shearing in pure shear of a Newtonian fluid. This maximum tension criterion is applied here to analyse the onset of cavitation for the irrotational motion of a viscous fluid, the special case imposed by the limit of very low Reynolds numbers and the fluid flow obtained from the numerical solution of the Navier–Stokes equations. The analysis leads to a dimensionless expression for the maximum tensile stress as a function of position which depends on the cavitation and Reynolds numbers. The main conclusion is that at a fixed cavitation number the extent of the region of flow at risk to cavitation increases as the Reynolds number decreases. This prediction that more viscous liquids at a fixed cavitation number are at greater risk of cavitation seems not to be addressed, affirmed nor denied, in the cavitation literature known to us.

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“…In order to find out the instantaneous discharge pressure, average discharge flow and the vibration characteristics of SWHAP, the test rig presented in Figure 10 is implemented in Beijing University of Technology. The tested pump (12) is driven by a 75-kW electric motor (10), and its speed is regulated by a frequency converter (9) ranging from 0 to 1500 r/min. The system pressure could be adjusted by throttle valve (17).…”

Section: Experimental Test Rigmentioning

confidence: 99%

“…As the liquids in the lubricating gaps cannot withstand tension, a cavity will open in the direction to the maximum tensile stress which is 45°from the plane of shearing in pure shear of a Newtonian fluid, and the cavitation will occur due to the large extensional stress. [10][11][12] Cavitation in hydraulic devices usually includes three forms: gaseous, vaporous and pseudo-cavitation. The gaseous cavitation is by the local reduction in the pressure below the level at which it is saturated with air, and then the air would be released from the solution, forming bubbles.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of cavitation performance in sea water hydraulic axial piston pump

Yin

Nie

Xiao

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part I:

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Cavitation is one of the important elements influencing the performance of sea water hydraulic axial piston pump. To understand the working performance of sea water hydraulic axial piston pump under cavitation effects, a fully dynamic numerical model was developed in this article, which has taken into account the fluid compressibility effect, dynamic processes of gaseous, vaporous, pseudo-cavitation and cavitation damage, and the simulation was conducted through a three-dimensional computational fluid dynamics code PumpLinx. The cavitation characteristics of the pump were presented with a set of working conditions, as well as the cavitation damage power, dynamic gas volume fraction and vapor volume fraction inside the intake, piston and port plate chamber. A test rig was developed to validate the computational fluid dynamics simulations for the case of sea water hydraulic axial piston pump. Comparisons between the measured and simulated instantaneous discharge pressure, average flow as well as the vibration characteristics under different extents of cavitation by varying the inlet pressure and rotational speed of the pump were presented.

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Fracture phenomena in shearing flow of viscous liquids

Cited by 7 publications

References 5 publications

Cavitation and the state of stress in a flowing liquid

Cavitation and the state of stress in a flowing liquid

Stress-induced cavitation for the streaming motion of a viscous liquid past a sphere

Numerical and experimental study of cavitation performance in sea water hydraulic axial piston pump

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Fracture phenomena in shearing flow of viscous liquids

Cited by 7 publications

References 5 publications

Cavitation and the state of stress in a flowing liquid

Cavitation and the state of stress in a flowing liquid

Stress-induced cavitation for the streaming motion of a viscous liquid past a sphere

Numerical and experimental study of cavitation performance in sea water hydraulic axial piston pump

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Product

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Fracture phenomena in shearing flow of viscous liquids