Experimental investigation of the acceleration statistics and added-mass force of deformable bubbles in intense turbulence

Salibindla, Ashwanth; Masuk, Ashik Ullah Mohammad; Ni, Rui

doi:10.1017/jfm.2020.1121

Cited by 10 publications

(5 citation statements)

References 49 publications

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“…Salibindla et al have shown that the added mass coefficient for deformable bubbles decreases as the bubbles deform and their aspect ratio along their semi-major and minor axes increases. 53 Sangani et al have illustrated that the changes in the added mass of the bubbles as a function of their surface tension (or Capillary number) are very small and negligible. 54 Presas et al have also mentioned that the added mass generally increases as the surface of the particle becomes more rigid.…”

Section: Methodsmentioning

confidence: 99%

A numerical lift force analysis on the inertial migration of a deformable droplet in steady and oscillatory microchannel flows

Lafzi

Dabiri

2022

Lab Chip

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Section: Methodsmentioning

confidence: 99%

A numerical lift force analysis on the inertial migration of a deformable droplet in steady and oscillatory microchannel flows

Lafzi

Dabiri

2022

Lab Chip

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“…( 6). The equation of motion for isolated deformable non-spherical bubbles is given by Salibindla et al (2021):…”

Section: Relevant Equationsmentioning

confidence: 99%

“…where the six terms on the right-hand side represent addedmass, drag, pressure gradient, history, lift and buoyancy forces, respectively. The added mass coefficient is C A , and ∇P is the pressure gradient around the bubble Salibindla et al (2021).…”

Section: Relevant Equationsmentioning

confidence: 99%

“…In the present study, we apply a model to determine the properties of a shock wave propagating through a quiescent aerated liquid, confined in a vertical elastic tube. The following assumptions are made: (1) the flow is one-dimensional, (2) the Basset history force F h is ignored in the model, as the effect of the Basset force is negligible for bubble Reynolds numbers Re (Takagi and Matsumoto 1996;Magnaudet and Eames 2000;Salibindla et al 2021), (3) the gas density is neglected since 𝜌 b ≪ 𝜌 l , (4) the lift force term (based on ∇ × u l = 0 ) is neglected, and (5) the thermodynamic behavior is adiabatic, since 𝜒∕ 𝜔R 2 ≈ O(10 −4 ) ≪ 1 ≪ l g ∕R ≈ O(10 2 ) for bubbles with a typical diameter of 5 mm (Van Wijngaarden 2007). Following Kalra and Zvirin (1981), velocities and gravitational acceleration are taken positive in downward direction.…”

Section: Model Frameworkmentioning

confidence: 99%

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Non-intrusive, imaging-based method for shock wave characterization in bubbly gas–liquid fluids

2023

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A novel experimental imaging-based method is presented for the non-intrusive determination of shock wave characteristics (i.e. shock wave speed and magnitude, and shock-induced liquid velocity) in a bubbly flow solely from gas bubble velocities. Shock wave speeds are estimated by the relative motion between gas bubbles at two locations by splitting the camera field-of-view using a mirror construction, increasing the dynamic spatial range of the measurement system. Although gas bubbles have in general poor tracing properties of the local fluid velocity, capturing the relative dynamics provides accurate estimates for the shock wave properties. This proposed imaging-based method does not require pressure transducers, the addition of tracer particles, or volumetric reconstruction of the gas bubbles. The shock wave magnitude and shock-induced liquid velocity are computed with a hydrodynamic model, which only requires non-intrusively measured variables as input. Two reference measurements, based on pressure transducers and the liquid velocity field by particle image velocimetry, show that the proposed method provides reliable estimates for the shock wave front speed and the shock-induced liquid velocity within the experimental range of 70 $$< U_\textrm{s}<$$ < U s < 400 m/s. Graphical abstract

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“…In EFD methods, researchers have developed numerous experimental techniques to study added mass, such as free oscillation [8][9][10][11] and forced oscillation [12][13][14][15][16]; these inertia methods, with extensive experimental setups like the Rotating Arm (RA) and Planar Motion Mechanism (PMM), are being developed [17,18]. Most added masses are currently analyzed from the hydrodynamic characteristics of oscillation, but new methods for solving added mass, such as PIV testing and trajectory tracking, have emerged [19][20][21], which can solve the added mass of deformable objects. EFD methods are the most direct way to solve added mass, with relatively mature related technologies.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Analysis of Added Mass for the Underwater Variable Speed Motion of Small Objects

Wang,

Xiao,

Wang

et al. 2024

JMSE

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Unlike uniform motion, when an object moves underwater with variable speed, it experiences additional resistance from the water, commonly referred to as added mass force. At present, several methods exist to solve this force, including theoretical, experimental, and simulation approaches. This paper addresses the challenge of determining the added mass force for irregularly shaped small objects undergoing variable speed motion underwater, proposing a method to obtain the added mass force through numerical simulation. It employs regression analysis and parameter separation analysis to solve the added mass force, added mass, viscous drag coefficient, and pressure drag coefficient. The results indicate that an added mass force exists during both the acceleration and deceleration of the object, with little difference between them. Under the same velocity conditions, significant differences exist in pressure drag forces, while differences in viscous drag forces are not significant. This suggests that the primary source of added mass force is pressure drag, with viscous drag having little effect on it. During acceleration, the surrounding fluid accelerates with the object, increasing the pressure drag with a high-pressure area concentrating at the object’s front, forming an added mass force that is directed backward. By contrast, during deceleration, the fluid at the object’s front tends to detach, and the fluid at the rear rushes forward, leading to a smaller high-pressure area at the front and a larger one at the rear, reducing the pressure drag and forming an added mass force that is directed forward. By comparing the added mass of a standard ellipsoid obtained from numerical simulation with theoretical values, the regression analysis method is proven to be highly accurate and entirely applicable for solving the added mass of underwater vehicles.

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Experimental investigation of the acceleration statistics and added-mass force of deformable bubbles in intense turbulence

Abstract: Abstract

Cited by 10 publications

References 49 publications

A numerical lift force analysis on the inertial migration of a deformable droplet in steady and oscillatory microchannel flows

A numerical lift force analysis on the inertial migration of a deformable droplet in steady and oscillatory microchannel flows

Non-intrusive, imaging-based method for shock wave characterization in bubbly gas–liquid fluids

Numerical Simulation and Analysis of Added Mass for the Underwater Variable Speed Motion of Small Objects

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