Visualization of flow fields in a Bubble Eliminator

Tanaka, Yutaka; Suzuki, Ryushi; Arai, K.; Iwamoto, Katsuharu; Kawazura, K.

doi:10.1007/bf03182458

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…The swirling flow accelerates downstream. Small bubbles are trapped and collected near the central axis in the tapered tube over a short time of about 100 ms by the swirling flow 9) . When back pressure is applied on the downstream side of the device, the collected bubbles are pushed out from the opposite side through a vent port.…”

Section: Bubble Separation Device By Swirling Flowmentioning

confidence: 99%

Control of Air Bubble Content in Working Oil by Swirling Flow

Sakama

Tanaka

KODERA

et al. 2022

JFPS International Journal of Fluid Power System

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Air bubbles mixed in the hydraulic oil of hydraulic power transmission systems causes deterioration of the dynamic characteristics of the system, component erosion, accelerated deterioration of the hydraulic oil, reduced heat dissipation, and vibration noise. In this paper, a method to controlling air bubble content by a swirling flow of working oil has been proposed and developed. The amount of air bubbles in the oil flowing out of a bubble separation device can be adjusted by controlling the opening and closing of the valve on a vent port of the device. The air bubble concentration exiting the output port of the bubble separation device is controlled by the opening time duration of the vent valve. The validity of the proposed method has been experimentally verified.

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Section: Bubble Separation Device By Swirling Flowmentioning

confidence: 99%

Control of Air Bubble Content in Working Oil by Swirling Flow

Sakama

Tanaka

KODERA

et al. 2022

JFPS International Journal of Fluid Power System

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“…There are two basic types of passive degassing cyclones, i.e., swirl vane separators which swirling flow results from guide vanes [8] and cyclonic separators which is an evolution from hydrocyclone mounted with a tangential inlet, with two outlets provided at the top and the bottom. The examples of cyclonic separators include gas-liquid cylindrical cyclone separator (GLCC) [9], inner-cone hydrocyclone [10,11], bubble eliminator with two tangential inlets [12], and planar cyclone for bubble separation [13]. According to an experimental report about planar degassing cyclones [13], only 0.075-0.323 s is needed to separate 100-μm bubbles with a cyclone diameter of 50 mm and tangential inlet velocity ranging from 3.7 to 7.4 m s -1 .…”

Section: Introductionmentioning

confidence: 99%

Performance of a Degassing Cyclone with Main and Subsidiary Chambers

Wang

Yang

2021

Chem Eng & Technol

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Based on the premise that large bubbles are removed in larger cyclones and small bubbles in smaller cyclones, a combined degassing cyclone with main and subsidiary chambers was designed to enhance liquid degassing. The pressure loss, liquid flow rate at the gas outlet, split ratio, gas flow rate at the liquid outlet, and degassing efficiency of the degassing cyclone were measured and calculated. Pressure loss correlations were established which relates the Euler number to the gas and liquid Reynolds numbers in the main chamber. Most cases exhibit a degassing efficiency greater than 0.998 when the liquid flow rate is more than 0.7 m 3 h -1 . The contours of pressure loss, split ratio, and degassing efficiency provide an effective guidance for designing a degassing cyclone.

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“…The removal of bubbles enables the control of heat transfer, because the vapor bubbles generated on a heating surface govern the rate of heat transfer to the liquid-phase. Thus far, bubble control methods using an ultrasonic wave [13] and a swirling flow [14] have been presented. However, the ultrasonic wave method is limited to only a single bubble and the swirling flow method cannot accurately control bubble motion.…”

Section: Introductionmentioning

confidence: 99%

Control of Air Bubble Cluster by a Vortex Ring Launched into Still Water

Uchiyama¹,

Kusamichi²

2017

IJCEA

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An experimental study searching for the possible generation and transport of a bubble cluster by a vortex ring in water is performed. A vortex ring is launched vertically upward into a water tank by discharging the water from a cylinder mounted at the bottom of the tank with a piston. Air bubbles are successively injected into the vortex ring from a needle attached to the cylinder outlet. The cylinder inner diameter D 0 and the piston stroke L 0 are 42.5 mm and 100 mm, respectively. The circulation of the vortex ring is less than 20000, and accordingly laminar vortex rings are launched. The mean diameter of the bubbles is 3.4 mm. The generation of bubble cluster and transport of the cluster by the vortex ring can be classified into four patterns according to the piston velocity (strength of the vortex ring) and the air volumetric flow rate. When the strength of the vortex ring is low, the bubbles are less affected by the vortex ring and instead rise with the buoyant force at a higher velocity than the vortex ring. With an increase in the strength of the vortex ring, the bubbles are entrained in the vortex core and form a cluster. The bubbles entrained in the vortex core circumferentially disperse around the vertical axis of the vortex ring, and they are successfully transported by the convection of the vortex ring. The convection velocity of the vortex ring is scarcely affected by the entrained bubbles, but the radius is enlarged slightly. The circulation of a vortex ring that entrains and transports air bubbles in this study is nearly accurately predicted by the formula of Milenkovic et al., which gives the circulation of a vortex ring entraining a single bubble in the vortex core. Index Terms-Bubble cluster, bubble entrainment, vortex ring, vorticity, visualization.

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Visualization of flow fields in a Bubble Eliminator

Cited by 12 publications

References 3 publications

Control of Air Bubble Content in Working Oil by Swirling Flow

Control of Air Bubble Content in Working Oil by Swirling Flow

Performance of a Degassing Cyclone with Main and Subsidiary Chambers

Control of Air Bubble Cluster by a Vortex Ring Launched into Still Water

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