Concentration Profiling Of Two Phase Flow In A Gravity Flow Rig Using Optical Tomography

2012 ◽  
Author(s):  
Sallehuddin Ibrahim ◽  
Mohd Fua’ad Rahmat ◽  
Mustafa Musbah Elmajri ◽  
Mohammad Amri Mohammad Yunus
Keyword(s):  
Cross Section ◽  
Two Phase Flow ◽  
Optical Tomography ◽  
Solid Particles ◽  
Gravity Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Tomography System ◽  
Infra Red ◽  
Tomography Method

Matlamat kertas kerja ini ialah untuk membentangkan penyelidikan tentang penggunaan kaedah tomografi optik menggunakan penderia–penderia infra merah untuk pemantauan masa nyata terhadap zarah–zarah pepejal yang dialirkan oleh rig aliran graviti. Penderia terdiri daripada dua projeksi cahaya orthogonal dan dua projeksi cahaya melintang untuk membentuk deretan atas dan bawah menjadi empat projeksi selari. Penumpuan pancaran daripada satu sumber cahaya dan mengalirkannya melalui rejim aliran yang memastikan keamatan pancaran dikesan pada bahagian yang bertentangan disambungkan kepada agihan dan pekali serapan bagi fasa–fasa yang berbeza dalam laluan pancaran. Maklumat pada aliran yang diperolehi oleh penderia-penderia yang dipasang di bahagian atas dan bawah akan dijadikan dalam bentuk digital oleh sistem perolehan data sebelum ia dihantar ke sebuah computer untuk dianalisis untuk memaparkan keratan silang imej. Penyelidikan ini berjaya dikembangkan dan diuji menggunakan sebuah sistem tomografi infra merah untuk memaparkan kepekatan aliran dwi fasa dalam rig aliran gravity. Kata kunci: Profil kepekatan; aliran dwi fasa; tomografi optic; infra-merah; aliran pepejal The objective of this paper is to present research on the use of an optical tomography method using infra–red sensors for real–time monitoring of solid particles conveyed by a gravity flow rig. The sensor comprised two orthogonal and two diagonal light projections to form upstream and downstream arrays in a total of four parallel projections. Collimating the radiated beam from a light source and passing it through a flow regime ensures that the intensity of radiation detected on the opposite side is linked to the distribution and the absorption coefficients of the different phases in the path of the beam. The information on the flow captured using upstream and downstream infra-red sensors is digitized by the DAS system before it was passed into a computer to be analyzed in order to reconstruct the cross section image. This investigation successfully developed and tested an infra–red tomography system to profile the concentration of two phase flow in a gravity flow rig. Key words: Concentration profiles; two phase flow; optical tomography; infra–red; solid flow

2D Measurement and Simulation of Microparticle Cross-Sectional Distribution by Micro Process Tomography

2010 ◽  
Author(s):  
Je-Eun Choi ◽  
Tong Zhao ◽  
Masahiro Takei
Keyword(s):  
Fluid Flow ◽  
Cross Section ◽  
Particle Distribution ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Particle Movement ◽  
Two Phase ◽  
Cross Sectional ◽  
Tomography System ◽  
Process Tomography

The application of micro process tomography to microchannels is considered in this paper. Using the micro process tomography system in microchannel, a particle distribution image can be obtained in a two phase flow. Based on the reconstructed image, it is easy to estimate the particle movement in a fluid flow. A novel microchannel system is designed for electrical process tomography that includes 60 electrodes distributed cross-sectional at five positions. The particle and water were injected into the microchannel, and then the capacitance of the fluid flow was measured at cross-section of microchannel. The result showed the 2D image of particle distribution of cross-section in the microchannel. Also, cross-sectional images of the particle distribution of a two phase flow are simulated.

Imaging Of Solid Flow In Air Using Dual Modality Tomography

2012 ◽  
Author(s):  
Salehuddin Ibrahim ◽  
Noorfaizah Mohammad Rohi ◽  
Mustafa Musbah Elmajri ◽  
Nor Syahiran Zahidin
Keyword(s):  
Pipe Wall ◽  
Optical Tomography ◽  
Phase Flow ◽  
Concentration Profiles ◽  
Two Phase ◽  
Solid Flow ◽  
Tomographic Images ◽  
Dual Modality ◽  
Tomography System ◽  
Infra Red

Matlamat keseluruhan projek ini ialah untuk menyelidiki manfaat yang boleh diperoleh daripada sistem tomografi dwi ragam (optik dan elektrodinamik) untuk mengukur imej tomografi terhadap aliran pepejal. Penyelidikan ini melibatkan kajian ke atas pengagihan manikmanik plastik yang dialirkan dalam sebuah paip dengan memasang penderia–penderia optik dan elektrodinamik di sekeliling paip tanpa mengganggu aliran di dalam paip. Sistem tomografi dwi raga mini dibahagikan kepada dua bahagian, yang terdiri dari perkakasan dan perisian. Perkakasan optik direka bentuk menggunakan 32 BPX65 penderia foto diod yang bertindak sebagai penerima dan dua lampu halogen yang bertindak sebagai pemancar cahaya. Penderia–penderia ini diatur sebagai dua projeksi selari. Penderia–penderia elektrodinamik direka bentuk menggunakan 16 elektrod yang dipasang pada jarak yang sama di sekeliling dinding paip. Sistem tomografi ini mampu memaparkan agihan kepekatan objek di dalam paip. Kata kunci: Profil kepekatan; aliran dwi fasa; tomografi optic; infra–merah; aliran pepejal The overall aim of this project is to investigate the benefits of dual modality (optical and electrodynamics) tomography system for the measurement of tomographic images of solids flow. This research will investigate the distribution of conveying plastic beads in a conveying pipe by placing optical and electrodynamics sensors around the pipe without interrupting the flow inside the pipe. The dual modality tomography system is divided into two main parts, which are the development of hardware and software. Optical hardware is designed using 32 BPX65 photodiode sensors acting as receivers and two halogen bulbs acting as light transmitters. The sensors are arranged as two parallel projections. The electrodynamics sensors are designed using 16 electrodes positioned equidistantly around the periphery of the pipe wall. The tomography system is able to display the concentration profile of the objects inside the pipe. Key words: Concentration profiles; two phase flow; optical tomography; infra–red; solid flow

Charge‐coupled device based on optical tomography system for monitoring two‐phase flow

2017 ◽  
Vol 53 (5) ◽  
pp. 331-333 ◽  
Author(s):  
J. Jamaludin ◽  
R. Abdul Rahim ◽  
H. Abdul Rahim ◽  
M.H. Fazalul Rahiman ◽  
J. Mohd Rohani
Keyword(s):  
Two Phase Flow ◽  
Optical Tomography ◽  
Phase Flow ◽  
Two Phase ◽  
Charge Coupled Device ◽  
Tomography System

Measuring Flow Pattern Asymmetry of Oil-Water Two Phase Flows Using Multi-channel Rotating Electric Field Conductance Signals

2018 ◽  
Vol 74 (1) ◽  
pp. 25-41 ◽  
Author(s):  
Yuansheng He ◽  
Yingyu Ren ◽  
Yunfeng Han ◽  
Ningde Jin
Keyword(s):  
Electric Field ◽  
Flow Pattern ◽  
Cross Section ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Time Asymmetry ◽  
Pipe Cross Section ◽  
Multi Scale ◽  
Oil Water

AbstractThe present study is a report on the asymmetry of dispersed oil phase in vertical upward oil-water two phase flow. The multi-channel signals of the rotating electric field conductance sensor with eight electrodes are collected in a 20-mm inner diameter pipe, and typical images of low pattern are captured using a high speed camera. With the multi-channel rotating electric field conductance signals collected at pipe cross section, multi-scale time asymmetry (MSA) and an algorithm of multi-scale first-order difference scatter plot are employed to uncover the fluid dynamics of oil-water two phase flow. The results indicate that MSA can characterise the non-linear behaviours of oil-water two phase flow. Besides, the MSA analysis also beneficial for understanding the underlying inhomogeneous distribution of the flow pattern in different directions at pipe cross section.

Solid–liquid two-phase flow and erosion calculation of butterfly valves at small opening based on DEM method

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Benliang Xu ◽  
Zuchao Zhu ◽  
Zhe Lin ◽  
Dongrui Wang
Keyword(s):  
Peer Review ◽  
Two Phase Flow ◽  
Solid Particles ◽  
Phase Flow ◽  
Butterfly Valve ◽  
Two Phase ◽  
Content Type ◽  
Small Opening ◽  
Solid Liquid ◽  
The Impact

Purpose The study aims to decrease the effect of solid particles on a butterfly valve, which will cause seal failure and leakage, providing a reference for anti-wear design. Design/methodology/approach In this paper, computational fluid dynamics discrete element method (CFD-DEM) simulation was conducted to study the solid–liquid two-phase flow characteristics and erosion characteristics of a butterfly valve with a different opening. Findings Abrasion at 10% opening is affected by high-speed jets in upper and lower parts of the pipeline, where the erosion is intense. The impact of the jet on the upper part of 20% opening begins to weaken. With the top backflow vortex disappearing, the effect of lower jet is enhanced. Meanwhile, the bottom backflow vortex phenomenon is obvious, and the abrasion position moves downward. At 30% opening, the velocity is further weakened, and the circulation effect of lower flow channel is more obvious than that of the upper one. Originality/value It is the first time to use DEM to investigate the two-phase flow and erosion characteristics at a small opening of a butterfly valve, considering the effect of inter-particle collision. Therefore, this study carries on the thorough analysis and discussion. At the same opening degree, with increasing of the particle size, the abrasion of valve frontal surface increases when the size is less than 150 µm and decreases when it is greater than 150 µm. For the valve backflow surface, this boundary value becomes 200 µm. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0264/

Note on Relationships between Friction and Liquid Cross-Sections during Two-Phase Flow

1966 ◽  
Vol 8 (1) ◽  
pp. 107-109 ◽  
Author(s):  
D. Chisholm
Keyword(s):  
Pressure Gradient ◽  
Cross Section ◽  
Cross Sections ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Pronounced Change ◽  
Two Phase ◽  
Horizontal Tubes ◽  
A Value ◽  
Friction Pressure

Relationships between the friction pressure gradient and the cross-section of the tube occupied by the liquid are developed for the flow of air-water mixtures in rough-walled horizontal tubes. The data indicate a pronounced change in the form of the relationships when the pressure gradient reaches a value of about 60 lb/ft2ft.

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