Oscillation Frequency &lt;inline-formula&gt; 
                     &lt;tex-math notation="LaTeX"&gt;$LC$ &lt;/tex-math&gt;
                  &lt;/inline-formula&gt;-Based Sensor for Characterizing Two-Phase Flows in Energy Systems

Elsaftawy, Ahmed; Potts, J. Baker; Ahmed, Wael H.

doi:10.1109/jsen.2018.2876200

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…The void fraction is defined as the percentage of the riser pipe that is occupied A capacitance sensor uniquely designed for this experimental setup that was dev by Elsaftawy et al [24] was used to measure the void fraction. This design is com of three main components: two capacitance sensors, a meter circuit, and a LabVIEW face [24]. The LabVIEW program was designed to receive, record and graph the tance signal as well as find the average void fraction.…”

Section: Capacitance Sensormentioning

confidence: 99%

Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications

Abed

Hussein

Ahmed

et al. 2021

Fluids

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Airlift pumps can be used in the aquaculture industry to provide aeration while concurrently moving water utilizing the dynamics of two-phase flow in the pump riser. The oxygen mass transfer that occurs from the injected compressed air to the water in the aquaculture systems can be experimentally investigated to determine the pump aeration capabilities. The objective of this study is to evaluate the effects of various airflow rates as well as the injection methods on the oxygen transfer rate within a dual injector airlift pump system. Experiments were conducted using an airlift pump connected to a vertical pump riser within a recirculating system. Both two-phase flow patterns and the void fraction measurements were used to evaluate the dissolved oxygen mass transfer mechanism through the airlift pump. A dissolved oxygen (DO) sensor was used to determine the DO levels within the airlift pumping system at different operating conditions required by the pump. Flow visualization imaging and particle image velocimetry (PIV) measurements were performed in order to better understand the effects of the two-phase flow patterns on the aeration performance. It was found that the radial injection method reached the saturation point faster at lower airflow rates, whereas the axial method performed better as the airflow rates were increased. The standard oxygen transfer rate (SOTR) and standard aeration efficiency (SAE) were calculated and were found to strongly depend on the injection method as well as the two-phase flow patterns in the pump riser.

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Section: Capacitance Sensormentioning

confidence: 99%

Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications

Abed

Hussein

Ahmed

et al. 2021

Fluids

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“…The static simulations were done using the electrostatic physics module. Using Equations Sensors 2020, 20, 2088 9 of 22 (13)-(15), the normalized capacitance was defined in order to obtain a linear relationship between the overall capacitance and the void fraction (α) as explained in details by Elsaftawy et al [16]:…”

Section: Optimizing the Sensor Geometry And Responsementioning

confidence: 99%

“…The electric displacement is then calculated using Equation (15). Lastly, the charge density is then found using Equation (16).…”

Section: = −mentioning

confidence: 99%

A New Capacitance Sensor for Measuring the Void Fraction of Two-Phase Flow Through Tube Bundles

Ahmed

Fatayerji

Elsaftawy

et al. 2020

Sensors

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Evaluating the two-phase flow parameters across tube bundles is crucial to the analysis of vibration excitation mechanisms. These parameters include the temporal and local variation of void fraction and phase redistribution. Understanding these two-phase parameters is essential to evaluating the stability threshold of tube bundle configurations. In this work, capacitance sensor probes were designed using finite element analysis to ensure high sensor sensitivity and optimum response. A simulation-based approach was used to calibrate and increase the accuracy of the void fraction measurement. The simulation results were used to scale the normalized capacitance and minimize the sensor uncertainty to ±5%. The sensor and required conditioning circuits were fabricated and tested for measuring the instantaneous void fraction in a horizontal triangular tube bundle array under both static and dynamic two-phase flow conditions. The static calibration of the sensor was able to reduce the uncertainty to ±3% while the sensor conditioning circuit was able to capture instantaneous void fraction signals with frequencies up to 2.5 kHz.

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Evaluating the two-phase flow development through orifices using a synchronised multi-channel void fraction sensor

Almalki

Ahmed

2020

Experimental Thermal and Fluid Science

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Oscillation Frequency <inline-formula> <tex-math notation="LaTeX">$LC$ </tex-math> </inline-formula>-Based Sensor for Characterizing Two-Phase Flows in Energy Systems

Cited by 12 publications

References 18 publications

Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications

Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications

A New Capacitance Sensor for Measuring the Void Fraction of Two-Phase Flow Through Tube Bundles

Evaluating the two-phase flow development through orifices using a synchronised multi-channel void fraction sensor

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