Velocity Measurement with Electrical Double-Sensing Devices in Two-Phase Flow

Sekoguchi, Kotohiko; Takeishi, Masayuki; Hironaga, K.; Nishiura, Takanori

doi:10.1007/978-3-642-82112-7_23

Cited by 13 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(19) using Eqs. (14) and (16) (20) Here, q' r and q' z also are correction factors which include the mean liquid holdup as qfr=(\ -sm)qr and qY =qzl(\ -O-Equation (8) was employed for vp and mean gas holdup was approximated as:…”

Section: Basic Equationsmentioning

confidence: 99%

Gas holdup and axial dispersion in gas-liquid concurrent bubble column.

Wachi

Morikawa

Ueyama

1987

J. Chem. Eng. Japan

View full text Add to dashboard Cite

An experimental investigation was carried out to determine the effect of liquid flow on gas holdup and axial dispersion coefficient in a gas-liquid concurrent bubble column 20 cm in diameter, in the ranges of gas and liquid superficial velocities of 0.21-0.87 and 0-1.16ms"1, respectively. Theoretical expressions of the turbulent recirculation flow were developed to account for the effect of liquid flow rate. With increasing liquid up flow rate, the value of axial dispersion coefficient decreases at relatively small liquid flow rate and turns to increase at large flow rate, whereas the value of gas holdup decreases simply. These phenomena were quantitatively explained by the developed theory, including the effect of column diameter.

show abstract

Section: Basic Equationsmentioning

confidence: 99%

Gas holdup and axial dispersion in gas-liquid concurrent bubble column.

Wachi

Morikawa

Ueyama

1987

J. Chem. Eng. Japan

View full text Add to dashboard Cite

show abstract

“…The mean velocity for the slug structure can hence be defined as distance between centres of measurement electrodes for two planes divided by the time delay [36][37][38]. The schematics of the ECT Sensor signals generation for measurement of velocity in two-phase flows is shown in Figure 6.…”

Section: Cross-correlationmentioning

confidence: 99%

The Effect of Liquid Viscosity on the Rise Velocity of Taylor Bubbles in Small Diameter Bubble Column

Kajero¹,

Abdulkadir²,

Abdulkareem³

et al. 2020

Vortex Dynamics Theories and Applications

View full text Add to dashboard Cite

The rise velocity of Taylor bubbles in small diameter bubble column was measured via cross-correlation between two planes of time-averaged void fraction data obtained from the electrical capacitance tomography (ECT). This was subsequently compared with the rise velocity obtained from the high-speed camera, manual time series analysis and likewise empirical models. The inertia, viscous and gravitational forces were identified as forces, which could influence the rise velocity. Fluid flow analysis was carried out using slug Reynolds number, Froude number and inverse dimensionless viscosity, which are important dimensionless parameters influencing the rise velocity of Taylor bubbles in different liquid viscosities, with the parameters being functions of the fluid properties and column diameter. It was found that the Froude number decreases with an increase in viscosity with a variation in flow as superficial gas velocity increases with reduction in rise velocity. A dominant effect of viscous and gravitational forces over inertia forces was obtained, which showed an agreement with Stokes law, where drag force is directly proportional to viscosity. Hence, the drag force increases as viscosity increases (5 < 100 < 1000 < 5000 mPa s), leading to a decrease in the rise velocity of Taylor bubbles. It was concluded that the rise velocity of Taylor bubbles decreases with an increase in liquid viscosity and, on the other hand, increases with an increase in superficial gas velocity.

show abstract

“…The point electrode method is used for measuring local void fraction (Sekoguchi et al 1975(Sekoguchi et al , 1984. As illustrated in Fig.…”

Section: Principle Of Measurementmentioning

confidence: 99%

Air/water two-phase flow test tunnel for airfoil studies

Ohashi

Matsumoto

Ichikawa

et al. 1990

Experiments in Fluids

View full text Add to dashboard Cite

Abstract.A test tunnel for the study of airfoil performances under air/water two-phase flow condition has been designed and constructed. This facility will serve for a better understanding of the flow phenomena and characteristics of hydraulic machinery under gas/ liquid two-phase flow operating conditions. At the test section of the tunnel, a two-dimensional isolated airfoil or a cascade of airfoils is installed in a two-phase inlet flow with a uniform velocity (up to 10 m/s) and void fraction (up to 12%) distribution. The details of the tunnel structure and the measuring systems are described and the basic characteristics of the constructed tunnel are also given. As an example of the test results, void fraction distribution around a test airfoil is shown.

show abstract

Velocity Measurement with Electrical Double-Sensing Devices in Two-Phase Flow

Cited by 13 publications

References 3 publications

Gas holdup and axial dispersion in gas-liquid concurrent bubble column.

Gas holdup and axial dispersion in gas-liquid concurrent bubble column.

The Effect of Liquid Viscosity on the Rise Velocity of Taylor Bubbles in Small Diameter Bubble Column

Air/water two-phase flow test tunnel for airfoil studies

Contact Info

Product

Resources

About