Bubble formation from a submerged single orifice accompanied by pressure fluctuations in gas chamber.

Abstract

An improved two-stage model is proposed to predict bubble volume and to explain the phenomena of bubble formation whenbubbles are formed from a submerged single orifice accompanied by pressure fluctuations in a gas chamber.The following conclusions are reached by comparing the calculated results based on the proposed model with the experimental results :(1) The calculated bubble volumes agree well with the experimental results over a wide range of experimental conditions. (2) The change of bubble volume with bubbling time and the phenomena of pressure fluctuations in the gas chamber are well described by the model.

Bubble formation in high‐pressure liquid–solid suspensions with plenum pressure fluctuation

“…Ž A two-stage spherical bubble formation model Ramakrishnan et al, 1969;Tsuge and Hibino, 1978;Luo et al, . 1998a is extended in this study to describe the bubble-formation process in liquids᎐solid suspensions with pressure fluctuations in the gas chamber.…”

Bubble emissions from submerged orifices – a critical review

“…Here, the ratio of the thickness to the diameter of the orifice plate was less than 0.5 in Tsuge and Hibino's [7] experiments while greater than 0.5 for Afgitidis et al [17]. The bubble volumes reported by Afgitidis et al [17] are again almost twice those of Tsuge and Hibino [7]. Hence, to obtain consistent bubble emission data standard procedures must be incorporated when fabricating and assembling equipment, i.e., the same material of construction of orifice plate, refined machining to produce a 90 O profile, similar surface roughnesses and the same ratio of thickness of orifice plate to diameter have to be employed to obtain reproducible measurements.…”

“…Table 5 compares the data of Tsuge and Hibino [7] with Afgitidis et al [17]. Here, the ratio of the thickness to the diameter of the orifice plate was less than 0.5 in Tsuge and Hibino's [7] experiments while greater than 0.5 for Afgitidis et al [17]. The bubble volumes reported by Afgitidis et al [17] are again almost twice those of Tsuge and Hibino [7].…”

“…This large disparity can only be attributed to lack of experimental rigor. Table 5 compares the data of Tsuge and Hibino [7] with Afgitidis et al [17]. Here, the ratio of the thickness to the diameter of the orifice plate was less than 0.5 in Tsuge and Hibino's [7] experiments while greater than 0.5 for Afgitidis et al [17].…”

Bubble formation from a vertically downward facing nozzle in liquids and molten metals.

“…(13) and p{ from Eq. (12). Table 1 gas flow rate increases, the apparent density of copper melt decreases and then the bubble size formed becomes larger.…”