Flow characteristics of the air-liquid mixed suction flow in sudden expansion micro-channel

Xu, Hanghang; Hu, Liang; Su, Rui; Liu, Wei-Ting; Fu, Xin

doi:10.1016/j.expthermflusci.2021.110519

Cited by 3 publications

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The visualization results showed that bubble growth is closely related to coolant flow velocity. Xu et al [15] studied air–water mixed flow regimes in microchannel. They found that bubbly/slug flow produced bubble detachment in the immediate vicinity of the expansion nozzle, and observed the abrupt changes from annular flow to slug flow.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using bubble tracking algorithm

Xiao

Zhang

2023

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using bubble tracking algorithm

Xiao

Zhang

2023

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

Effect of liquid level monitor gas injection point size on information source amplitude-frequency characteristics

Liu,

Quan,

et al. 2024

Sci Rep

View full text Add to dashboard Cite

In order to analyse the effect of the injection point size of the CBM (Coalbed Methane) well level monitor on the amplitude and frequency of pressure pulsations in the wellhead manifold, numerical simulations and experiments were carried out to investigate the effect of different injection point sizes on the amplitude and frequency of pressure pulsations downstream of the sudden expansion structure. Using compressed air as the fluid and the size of the injection point as the variable, the amplitude and frequency of pressure pulsations at different locations downstream of the sudden expansion structure were tested. The results show that the pressure pulsation amplitude is affected by the size of the injection point, and the larger the injection point is, the larger the pressure pulsation amplitude is; the size of the injection point has less influence on the pressure pulsation frequency downstream of the protruding and expanding structure, and the pressure pulsation frequency at 0.5 m and 1 m downstream of the protruding and expanding structure is in the vicinity of 76 Hz. Therefore, the echo signal processing should be filtered around this frequency to obtain accurate liquid level echo signals, so as to improve the accuracy of liquid level monitoring and realise the efficient development of coalbed methane wells.

show abstract

On the rising dynamics of a Taylor bubble in sudden/gradual expansion tubes filled with viscoelastic liquids

Li,

Ba,

Yuan

et al. 2024

Mod. Phys. Lett. B

View full text Add to dashboard Cite

In this paper, the rise behaviors of Taylor bubbles are investigated in sudden/gradual tubes filled with viscoelastic media via grid adaptive direct numerical simulations (DNS). The exponential Phan–Thien–Tanner (PTT) constitutive model is used to describe the viscoelastic rheological characteristics, and the phase interface is captured via the volume of fluid (VOF) method. The effects of tube structure (diameter ratio and structural angle) and fluid elasticity (expressed by the Weissenberg number Wi) on bubble dynamics have been studied. Our results indicate that bubbles are prone to rupture in the expansion tubes, mainly due to the dual effects of the wall and the elastic relaxation. The fluid elasticity suppresses the jet effect in a sudden expansion tube. Meantime, as the structural angle or the diameter ratio increases, the wall effect is weakened on axial or radial scales, inhibiting the bubble rupture. A large structure angle attenuates the wall effect, while changes in the diameter ratio slow down the radial momentum transfer near the wall region, both of which favor bubble integrity. We also obtain an exponential relationship between the critical rupture time and the structure angle. The dynamical Taylor bubbles can be operated by the structure of the tube and surrounding fluid viscoelasticity, which is of great significance in chemical engineering applications involving complex non-Newtonian fluids.

show abstract

Flow characteristics of the air-liquid mixed suction flow in sudden expansion micro-channel

Cited by 3 publications

References 27 publications

Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using bubble tracking algorithm

Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using bubble tracking algorithm

Effect of liquid level monitor gas injection point size on information source amplitude-frequency characteristics

On the rising dynamics of a Taylor bubble in sudden/gradual expansion tubes filled with viscoelastic liquids

Contact Info

Product

Resources

About