Bubble Formation at a Rotating Cylindrical Surface in Cross‐Flowing Liquid

Machniewski, P.; num, Bi; Andrzej, K; Evans, Geoffrey M.

doi:10.1002/cjce.5450820304

Cited by 1 publication

(3 citation statements)

References 13 publications

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“…A high‐speed imaging technique was chosen to record bubble formation. Many other studies dedicated to the investigation of bubble formation regimes utilized a similar approach . Here, a high‐speed camera with a 35 mm lens was employed.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Many other studies dedicated to the investigation of bubble formation regimes utilized a similar approach. [19,28,34,35] Here, a high-speed camera with a 35 mm lens was employed. The camera and a dual, continuous light source (2 Â 300 W), which were set up on opposite sides of the channel assembly, were used to capture the gas-liquid interactions.…”

Section: Methodsmentioning

confidence: 99%

“…Silberman [22] E, T J Sullivan et al [23] E, T SB Kawase and Ulbretch [24] T SB Tsuge and Hibino [25] E, T SB Wace et al [20] E, T SB, J Marshall et al [26] E, T SB Oĝuz and Prosperetti [27] E, N, T SB Rigby et al [28] E, T SB, P, J Forrester and Rielly [21] E SB, P, J, C Iguchi et al [3] E SB Tan et al [29] T SB Sovani [30] E, N (SB only), T SB, P, J Nahra and Kamotani [31] E, N, T SB Zhang and Tan [32] E, N, T SB Loubiere et al [33] E, T SB Machniewksi et al [34] E, T C Duhar and Colin [9] E, T SB Liu et al [13] N, T SB [20] Air Water Rotary bubble generator (55 mm radius) 2, 3, 5, Horizontal U L ¼ 0.1 to 2.5 m/s SB Orifice location 40 mm from centre 8 Q G ¼ 2 to 20 Â 10 À6 m 3 /min J h L ¼ 220 mm of water Rigby et al [28] Air Water 400 (depth) Â 50 (wide) mm 2 rectangular duct 2 Horizontal U L ¼ 0 to 1.2 m/s SB Injection orifice located in a cylindrical impeller blade…”

Section: Bubbling Regimes Evaluatedmentioning

confidence: 99%

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Bubble formation regimes during gas injection into a liquid cross flow in a conduit

2016

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A study was performed to characterize the different bubble formation regimes that occur during the process of gas jet injection into a liquid cross flow in a conduit. Air was injected perpendicularly into a turbulent, fully developed water flow circulating through a 12.7 mm square channel. Three different gas injectors, with diameters of 0.27 mm, 0.52 mm, and 1.59 mm were used. The bulk water velocity values ranged between 1.1 and 4.3 m/s. The effects that the gas injection velocity, liquid mean velocity, and injection gas injection diameter have on the process of bubble generation were investigated. A high‐speed visualization technique was used to determine the regimes near the gas inlet region. Four distinct regimes were identified: Single Bubbling (SB), Pulse (P), Elongated Jetting (EJ), and Atomizing Jetting (AJ). It was observed that the shift between regimes occurs gradually, producing the need to identify transitional regions: SBP and PTJ. Sets of independent dimensionless variables were used to categorize the proposed regimes using bubble formation maps. It was determined that the injection diameter plays a primary role in jet formation: as the injection diameter increased, the observable number of regimes decreased, indicating a more stable and continuous process of bubble generation. Empirical correlations that delimit the boundaries between ordered and chaotic bubble generation are presented.

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Section: Experimental Methodsmentioning

confidence: 99%