Development of a virtual EXV flow sensor for applications with two-phase flow inlet conditions

2014 ◽  
Vol 45 ◽  
pp. 243-250 ◽  
Author(s):  
Christian K. Bach ◽  
Eckhard A. Groll ◽  
James E. Braun ◽  
W. Travis Horton
Keyword(s):  
Two Phase Flow ◽  
Flow Sensor ◽  
Phase Flow ◽  
Two Phase ◽  
Inlet Conditions

CFD Prediction of Safety Valve Disc Forces Under Two Phase Flow Conditions

2018 ◽  
Author(s):  
William Dempster ◽  
Moftah Alshaikh
Keyword(s):  
Two Phase Flow ◽  
Safety Valve ◽  
Phase Flow ◽  
Complex Flow ◽  
Two Phase ◽  
Wide Range ◽  
Valve Disc ◽  
Valve Dynamics ◽  
Inlet Conditions ◽  
Industrial Refrigeration

At present there are very few published works on prediction based methods to establish the forces that act on safety valves during two-phase operation. This means that the valve dynamics and resulting opening and closure are uncertain for a wide range of complex flow applications. This paper describes a study whereby a safety valve, primarily developed for the industrial refrigeration sector is investigated for a range of steady state high gas mass fraction inlet conditions, (gas mass quality 1-0.2) and the disc force characteristics measured for valve choked conditions. The highly compressible two phase flow processes are modelled using an Euler–Euler two fluid CFD approach and the results compared with the experiments. Results indicate that CFD approaches can reasonably capture the key processes but deficiencies exist due to the prediction of two phase built up backpressure in the valve. The methods and data trends are discussed to show the effectiveness of current modelling approaches.

Investigation of the characteristics of a fiber-optic gas–liquid two-phase flow sensor

2020 ◽  
Vol 37 (10) ◽  
pp. 1687
Author(s):  
Yu Ma ◽  
Xu Zhang ◽  
Yangrui Zhang ◽  
Song Li ◽  
Weimin Sun ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Two Phase Flow ◽  
Flow Sensor ◽  
Phase Flow ◽  
Two Phase

Co-Current Air-Water Two Phase Flow Patterns in Horizontal and Vertical Circular Tube Under Various Inlet Conditions

2011 ◽  
Author(s):  
S. Zeguai ◽  
S. Chikh ◽  
O. Rahli ◽  
L. Tadrist
Keyword(s):  
Annular Flow ◽  
Two Phase Flow ◽  
Bubbly Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Transition Flow ◽  
Two Phase ◽  
Experimental Apparatus ◽  
Inner Diameter ◽  
Inlet Conditions

An experimental apparatus is setup to analyze a co-current air-water two phase flow in a 3 mm inner diameter tube with horizontal and vertical orientations. Air is axially injected through a nozzle of 260 μm of inner diameter. Air and water flow rates are accurately controlled at the inlet, covering a range of apparent velocities JL = 0.00118 to 0.0786 m/s, JG = 0.002 to 3.538 m/s for the horizontal tube and JL = 0.00078 to 0.0589 m/s, JG = 0.003 to 3.538 m/s for the upward flow. A fast camera with 250 fps is utilized to visualize the flow patterns. The experiments showed that the flow structures are very sensitive to inlet conditions. Within the covered range of velocities, several flow patterns were observed, namely bubbly flow, bubbly-slug transition flow, slug flow, slug-annular transition flow, annular flow, wavy annular flow and annular flow with dry zones. In the bubbly flow regime, a particular bubbly helical flow is observed before the dispersed bubbly flow.

scholarly journals Experimental investigation of the two-phase flow regimes and pressure drop in horizontal mini-size rectangular test section

2012 ◽  
Vol 33 (2) ◽  
pp. 47-65
Author(s):  
Amr Mohamed Elazhary ◽  
Hassan M. Soliman
Keyword(s):  
Pressure Drop ◽  
Flow Regime ◽  
Test Section ◽  
Two Phase Flow ◽  
Rectangular Cross Section ◽  
Rectangular Channel ◽  
Flow Regimes ◽  
Phase Flow ◽  
Two Phase ◽  
Inlet Conditions

Abstract An experimental study was conducted in order to investigate two-phase flow regimes and fully developed pressure drop in a mini-size, horizontal rectangular channel. The test section was machined in the form of an impacting tee junction in an acrylic block (in order to facilitate visualization) with a rectangular cross-section of 1.87-mm height on 20-mm width on the inlet and outlet sides. Pressure drop measurement and flow regime identification were performed on all three sides of the junction. Air-water mixtures at 200 kPa (abs) and room temperature were used as the test fluids. Four flow regimes were identified visually: bubbly, plug, churn, and annular over the ranges of gas and liquid superficial velocities of 0.04 ≤ JG ≤ 10 m/s and 0.02 ≤ JL ≤ 0.7 m/s, respectively, and a flow regime map was developed. Accuracy of the pressure-measurement technique was validated with single-phase, laminar and turbulent, fully developed data. Two-phase experiments were conducted for eight different inlet conditions and various mass splits at the junction. Comparisons were conducted between the present data and former correlations for the fully developed two-phase pressure drop in rectangular channels with similar sizes. Wide deviations were found among these correlations, and the correlations that agreed best with the present data were identified.

scholarly journals High Temperature Co-firing of 3D-Printed Al-ZnO/Al2O3 Multi-Material Two-Phase Flow Sensor

2021 ◽  
Author(s):  
Danwei Zhang ◽  
Win Jonhson ◽  
Tun Seng Herng ◽  
Xi Xu ◽  
Xiaojing Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Two Phase Flow ◽  
Flow Sensor ◽  
Phase Flow ◽  
Two Phase ◽  
3D Printed

Experimental Investigation on Two-Phase Flow Distribution in Multi-Channel Manifold With Two Radial Inlets

2009 ◽  
Author(s):  
Liping Pang ◽  
Baomin Sun ◽  
Bo Wang
Keyword(s):  
Experimental Investigation ◽  
Water Flow ◽  
Significant Variation ◽  
Two Phase Flow ◽  
Air Flow ◽  
Flow Distribution ◽  
Phase Flow ◽  
Two Phase ◽  
Parallel Channels ◽  
Inlet Conditions

An experimental investigation was conducted to study the two-phase flow distributions in a horizontal cylindrical manifold with two radial inlets and 11 parallel channels. The effects of the different inlet conditions on two-phase flow distribution of parallel channels in the manifold were investigated. The flow rates of air and water in 11 channels were measured under symmetrical and unsymmetrical inlet conditions. Experimental results show that the air and water flow distributions of manifold at channels keep a stable flow ratio when two radial inlet conditions keep symmetrical. Water flow distribution has a significant variation and air flow distribution has a small change when two radial inlet conditions keep unsymmetrical and water superficial velocity increases at right inlet. Water and air flow distribution has a significant variation when two radial inlet conditions keep unsymmetrical and air superficial velocity decreases.

scholarly journals The Development of a Gas–Liquid Two-Phase Flow Sensor Applicable to CBM Wellbore Annulus

Sensors ◽  
2016 ◽  
Vol 16 (11) ◽  
pp. 1943 ◽  
Author(s):  
Chuan Wu ◽  
Guojun Wen ◽  
Lei Han ◽  
Xiaoming Wu
Keyword(s):  
Two Phase Flow ◽  
Flow Sensor ◽  
Phase Flow ◽  
Two Phase

The Effects of Inlet Flow Conditions on Gas-Liquid Two-Phase Flow in a Micro Tube

2007 ◽  
Author(s):  
Shota Hayashi ◽  
Nobuhide Kasagi ◽  
Yuji Suzuki
Keyword(s):  
Heat Transfer ◽  
Pressure Loss ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Flow Conditions ◽  
Two Phase ◽  
Inlet Flow ◽  
Annular Flows ◽  
Inlet Conditions

In the present study, the effects of inlet geometry on the microscale two-phase flow patterns have been examined. The relationships among the flow pattern, the void fraction, the pressure loss and the heat transfer coefficient have been also investigated under different inlet flow conditions. At the inlet, a stainless steel tube is inserted into the micro glass tube, of which inner diameter is 300 and 600 μm. The gas and liquid paths and the diameter of the inner tube are interchangeable. The flow patterns are recorded at the inlet and also in the developed region in the micro tubes. The flow patterns observed in the 600 μm tube are bubbly, slug, churn and annular flows, while bubbly and churn flows are not present in the 300 μm tube. For bubbly and slug flows, bubble formation process is found to be strongly affected by the inlet conditions. Accordingly, the pressure loss as well as the heat transfer rate are changed. In addition, the bubble size is not uniquely determined; bubbles of different sizes are observed in repeated experiments under the same inlet flow conditions. On the other hand, for churn and annular flows, the flow patterns are not affected by the inlet conditions.

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