How to measure void fraction of two-phase cryogenic flows

Filippov, Yu. P.

doi:10.1016/s0011-2275(01)00080-7

Cited by 14 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electrode geometry was designed to maximize the signal level and minimize the singularities (areas of dense non-uniform electric field). Some have posited that capacitance techniques are not sensitive enough to measure the small difference in dielectric between liquid and gaseous cryogens [9]. However, this is mostly an issue of the sensitivity and stability of the electronics and sensor design rather than a theoretical limitation.…”

Section: Capacitance Sensing Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Capacitance-based measurement of volume fraction, velocity, and mass flow rate of cryogenic nitrogen two-phase flow

Straiton,

Charleston,

Marashdeh

2024

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Cryogenic fluid flow is a critical measurement parameter but is difficult to properly measure due to the extreme environmental conditions and the frequent presence of multiphase flow during saturated liquid transfers. Multiphase flow proves challenging for most flow measurement methodologies; furthermore, additional measurements of volume fraction, quality, and slip velocity are often required. In-line capacitance-based sensors have the potential to overcome these limitations. In this paper, a capacitance sensor in a multiphase cryogenic flow loop is evaluated for its ability to measure liquid volume fraction, gas phase velocity, and total mass flow rate for two-phase cryogenic nitrogen flow.

show abstract

Section: Capacitance Sensing Methodsmentioning

confidence: 99%

“…In addition to two-phase mass flow measurement, research has been done on developing two-phase volume fraction meters using capacitance [5,6,7], radio frequency [8,9], optical visualization [10], capacitance tomography [11,12], calorimetric method [2], and gamma radiation [1].…”

Section: Introductionmentioning

confidence: 99%

Capacitance-based measurement of volume fraction, velocity, and mass flow rate of cryogenic nitrogen two-phase flow

Straiton,

Charleston,

Marashdeh

2024

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Many efforts have been made to obtain the phase distribution of the cryogenic twophase flow, including the use of the capacitive probe method [5], the radio-frequency sensor (RF-sensor) [6][7][8], the dual-electrode capacitance sensor [4], and particle image velocimetry (PIV) [9]. Comparably, electrical capacitance tomography (ECT), as a non-intrusive measurement technique, can reconstruct the phase distribution image based on the dielectric permittivity difference between the phases.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Landweber Coupled Least Square Support Vector Regression Algorithm for Electrical Capacitance Tomography for LN2–VN2 Flow

Tian,

Gao,

Xia

et al. 2023

Energies

View full text Add to dashboard Cite

The electric capacitance tomography (ECT) technique has been widely used in phase distribution reconstruction, while the practical application raised nonideal noise and other errors for cryogenic conditions, requiring a more accurate algorithm. This paper develops a new image reconstruction algorithm for ECT by coupling the traditional Landweber algorithm with the least square support vector regression (LSSVR) for cryogenic fluids. The performance of the algorithm is quantitatively evaluated by comparing the inversion images with the experimental results for both the room temperature working medium with the dielectric constant ratio close to cryogenic fluid and the cryogenic fluid of liquid nitrogen/nitrogen vapor (LN2-VN2). The inversion images based on the conventional LBP and Landweber algorithms are also presented for comparison. The benefits and drawbacks of the developed algorithms are revealed and discussed, according to the results. It is demonstrated that the correlated coefficients of the images based on the developed algorithm reach more than 0.88 and a maximum of 0.975. In addition, the minimum void fraction error of the algorithm is reduced to 0.534%, which indicates the significant optimization of the LSSVR coupled method over the Landweber algorithm.

show abstract

Two-phase cryogenic flow meters

Filippov

Panferov

2011

Cryogenics

View full text Add to dashboard Cite

How to measure void fraction of two-phase cryogenic flows

Cited by 14 publications

References 13 publications

Capacitance-based measurement of volume fraction, velocity, and mass flow rate of cryogenic nitrogen two-phase flow

Capacitance-based measurement of volume fraction, velocity, and mass flow rate of cryogenic nitrogen two-phase flow

Evaluation of Landweber Coupled Least Square Support Vector Regression Algorithm for Electrical Capacitance Tomography for LN2–VN2 Flow

Two-phase cryogenic flow meters

Contact Info

Product

Resources

About