The behavior of bubbles in Bueche model fluids

Brujan, Emil-Alexandru

doi:10.1002/pen.760342006

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…As R 0 decreases to 10 −2 mm, the maximum bubble wall pressure decreases to 6:07 ×10 3 and is then within an order of magnitude of the similar value in water (p max =p ∞ = 2:33 × 10 4 ). This ÿnding is in qualitative agreement with the predictions of several incompressible formulations derived by using di erent rheological models (Shima and Tsujino, 1981;Shima et al, 1983 andBrujan, 1994). It is possible that the substantial reduction of the maximum bubble wall pressure caused by the polymer additives in the case of very small bubbles may cause a corresponding reduction in cavitation damage.…”

Section: Numerical Results and Discussionsupporting

confidence: 87%

Bubble dynamics in a compressible shear-thinning liquid

Brujan¹

1998

Fluid Dyn. Res.

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The radial dynamics of a spherical gas bubble in a compressible shear-thinning liquid is studied by means of a singular perturbation method to ÿrst order in the bubble-wall Mach number. The Williamson rheological model is adopted to describe the shear-thinning characteristic of liquid viscosity. The equation of motion for the bubble radius, the equation of the natural frequency of the bubble and the pressure equation are derived. Numerical calculations are presented using the experimental data for two polymer aqueous solutions, viz. HEC and CMC solutions, and water. It is found that the shear-thinning characteristic of liquid viscosity strongly in uences only the behaviour of bubbles with initial radii smaller than 10 −1 mm and the rheological parameter with the strongest in uence on bubble collapse is the inÿnite-shear viscosity. The e ect of polymer additives, including their surfactant properties, on spherical bubble collapse is also discussed.

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Section: Numerical Results and Discussionsupporting

confidence: 87%

Bubble dynamics in a compressible shear-thinning liquid

Brujan¹

1998

Fluid Dyn. Res.

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“…The dependence of zero‐shear viscosity ( η 0 ) on concentration ( c ) is usually used to distinguish the dilute and concentrated solution regions of polymer solution. The η 0 value is usually estimated from the Newtonian flow region at low shear rates or various models such as Bueche model, 43 Carreau model, 44 Cross model, 45 Ellis model, 46 and power‐law fluid model, 47 which are used to simulate the relationship between the apparent viscosity ( η a ) and shear rate. So far, no models have been found for simulation of shear‐thickening behavior of polymer solutions.…”

Section: Resultsmentioning

confidence: 99%

“…To prevent the solution concentration from changing resulted from solvent evaporation, the sample solution was covered with a thin layer of lowviscosity silicone oil. 5,42 The usually used viscosity models of Bueche model, 43 Carreau model, 44 Cross model, 45 Ellis model, 46 and power law model, 47 as well as the yield stress models of Bingham model, 48 Casson model, 49 Cox-Merz model, 50 and Herschel-Bulkley model 51 were used to simulate the steady shear rheological behaviors of polysaccharides.…”

Section: Steady-shear Viscosity Measurementmentioning

confidence: 99%

Steady and transient rheological properties of four polysaccharides with different chain conformations

Hu,

Cui,

et al. 2023

Journal of Polymer Science

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Carbohydrate polymers have broad application prospects, especially in food and cosmetic fields, and rheology is very important for controlling the quality and functions of their final products. Therefore, the steady and transient rheological behaviors of polysaccharides with different chain conformations of triple helix, double helix, and random coils were studied systematically. In our findings, the extraordinary low‐shear thickening phenomena of polysaccharides (lentinan, curdlan, and xanthan) with helix conformation were observed at a certain concentration depending on the stiffness and molecular weight, different from the steady‐shear rheological property of pullulan, which was attributable to the arrangement from order to disorder of stiff chains at the shear rate of < 0.1 s−1. Lentinan, curdlan, and xanthan in solution showed obvious viscoelasticity and thixotropic behavior with significant concentration and stiffness dependence, while the flexible pullulan only exhibited Newtonian viscous fluid even at high concentration of 20%. Stress overshoot for the four polysaccharides occurred after shearing, and the higher stiffness and molecular weight delayed the occurrence of stress overshoot. Obviously, chain conformation plays a key role on controlling the rheology of polysaccharides. This work provides scientific basis for the application of these polysaccharides in food and cosmetics field.

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“…The power-law model was adopted by Yang and Yeh [21] and Shima and Tsujino [22] in their investigations. In addition, the Casson model [23], the Ellis model [24], Sisko model [25], the Carreau model [26], the Powell-Eyring model [27], the Shima model [28], the Williamson model [29,30], and the Bueche model [31] have been applied.…”

Section: Equations Of Motion For the Bubble Radiusmentioning

confidence: 99%

Cavitation bubble dynamics in non‐Newtonian fluids

Brujan

2008

Polymer Engineering & Sci

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Cavitation phenomena play important roles in many areas of science and engineering. The most interesting effect of the non‐Newtonian properties of the liquid is the reduction of cavitation damage and noise. This article reviews experimental and theoretical efforts to understand such phenomena. Two major areas of research are described, namely the dynamics of cavitation bubbles oscillating in a liquid of infinite extent, and the behavior of bubbles collapsing near rigid walls. POLYM. ENG. SCI., 2009. © 2008 Society of Plastics Engineers

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The behavior of bubbles in Bueche model fluids

Cited by 5 publications

References 12 publications

Bubble dynamics in a compressible shear-thinning liquid

Bubble dynamics in a compressible shear-thinning liquid

Steady and transient rheological properties of four polysaccharides with different chain conformations

Cavitation bubble dynamics in non‐Newtonian fluids

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