10th Seminar of NETeF's Multiphase Flow Group.

Development of a fast-response capacitive sensor for two and three-phase annular-duct flow

Marlon Mauricio Hernandez Cely

Supervisor: Prof. Dr. Oscar M. H. Rodriguez.

November 29 th, 2013

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Content

• Data processing of the thesis. “Stratifying of liquid-liquid two phase flows through sudden expansion” NAZRUL

HIZAM YUSOFF, BSc. • Development of electrical circuits . • Development of basic and detailed engineering for

equipment acquisition and data processing. • Disciplines studied.

Stratifying of liquid-liquid two phase flows through sudden expansion” NAZRUL HIZAM YUSOFF, BSc.

P&ID Process and Instrumentation Diagrams.

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Data processing of the thesis. “Stratifying of liquid-liquid two phase flows through sudden expansion”

• In the present study, a 24 x 24 wire.

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Design of capacitance wire mesh sensor (CapWMS)

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characteristics of the sensor :

• based on capacitance (permittivity) measurements.

• wires of 0.12 mm diameter.

• 2.83 mm wire separation within each plane, and 1.35 mm axial plane distance.

• The pressure drop across the sensor is small (approximately 3%).

• The spatial resolution of the images generated by the sensor is 2.83 mm.

• Trials showed that a 10 second sampling period gave sufficient data for

temporal resolution.

Experiment results (comparison). • Oil volume fraction and phase distributions in a pipe cross section for distance

from expansion 10D, mixture velocity 0.20 m/s and horizontal flow, at different input oil fractions (OVF 0.2; OVF O.6). can be improved using interpolation.

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Finer image.

Interface degraded.

Data taken from the horizontal pipe.

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Oil Volume fraction Um (m/s) Near (10 D) Mid (20 D) Far (34 D)

0,20 Run 001 Run 022 Run 043

0,30 Run 002 Run 023 Run 044

0,35 Run 003 Run 024 Run 045

0,20 Run 007 Run 028 Run 049

0,30 Run 008 Run 029 Run 050

0,35 Run 009 Run 030 Run 051

0,20 Run 013 Run 034 Run 055

0,30 Run 014 Run 035 Run 056

0,35 Run 015 Run 036 Run 057

0,20 Run 019 Run 040 Run 061

0,30 Run 020 Run 041 Run 062

0,35 Run 021 Run 042 Run 063

0,2

0,4

0,6

0,8

Ho

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Conceptual and Basic Engineering.

• The Conceptual and Basic Engineering is used to identify the technical and economic feasibility of the project, which will set the tone for the development of basic and detailed engineering. It is based on a previous study (feasibility study) and the definition of project requirements.

• Is the first phase or stage of an engineering project the technologies to be applied are established, the framework of technical standards to regulate the design are defined, and the economic evaluation criteria.

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List of variables or preliminary aspects of the

Conceptual Engineering PCI Express data acquisition card

• Process flow diagram.

• Capacity required by the project.

• Process description.

• Rules and regulation.

• Preliminary list of equipment.

• Investment costs (with an accuracy ±30%).

• Operation and maintenance costs.

• Provision for future expansion.

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Data Acquisition with PXI Express

• PXI ExpressTM NI PXIe-1071

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Main characteristics of the equipment

• Sampling Frequency: 100MS/s Bandwidth: 100MHz

• Resolution: 14bits Input Impedance: 1Mohm (high)

• Interface bus: PCIe, PXIe Number of channels: 16 sixteen

• Memory: 8MB

Development of electrical circuits.

• An electronic circuit design 16x16 channels and one 32x32 channels 11

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Multiplexers

Counters

Comparators

Digital circuit

Combinational design

Digital logic design

Signal processing for

the sensor

Filtering in the Frequency Domain

• Frequency domain filtering operations.

• Basic steps for filtering in the frequency domain.

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Filtering in the Frequency Domain Lowpass filtering

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Reduction of fine lines in the image

Remove image noise

Application

Highpass (Sharpening) Frequency Domain Filters

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Identifies and highlights the bubbles in an image

Mark the boundary lines of the image

the results are much smoother

Application

Disciplines studied

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SEM5749-6/7

Mecânica dos Fluidos

SEM5740-5/4

Matemática para Engenheiros

SEM5892-7/7

Metodologia e Pesquisa Bibliográfica

SEL5895-7/2

Introdução ao Processamento Digital de Imagens

SEM5872-2/3

Tópicos Avançados em Mecânica dos Fluídos

Future work

• Study of the signal phase information.

• Development of a new Sensor for the separator.

• Identifying a system with a recursive algorithm.

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Thank you

• Prof. Dr. Oscar M. H. Rodriguez.

• Engineers: Hugo, Adriana, Iara.

• Engineers, biphasic: Prof. Dr. Marcelo, Marcel ; Carlos Marlon Murilo, Felipe.

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