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Author: Claude P. Brancart
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Claude P. Brancart
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Korhan Kaan Pehlivan
Publisher:
ISBN:
Category : Friction
Languages : en
Pages : 0
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Book Description
The new experimental test facility was designed in order to generate an experimental database for pressure drop and flow regime maps in mini- and micro-channels. The test facility was equipped with state-of-the-art flow meters and differential pressure transducers. Once the test facility was built, three different circular test sections, with diameters of 3 mm, 1 mm, and 800?m, were used to study the two-phase frictional pressure drop and flow regime transition regions. Most of the experiments for each test section were executed at high local superficial gas velocities (U GS> 10 m/s). The experimental pressure drop data was compared with the homogenous model, the Friedel (1979) model, and the Chisholm (1967) model. The homogenous model showed the most similarities with the data acquired during the course of this experiment, with an average error of 1.2%, 15.6%, and 24.1% for the 3 mm, 1 mm, and 0.8 mm test sections, respectively. However, it was also observed that the standard deviation of the errors increased as the channel diameter decreased. The Friedel (1979) model over-predicted the pressure drop for every test section, while the Chisholm (1967) model mostly underpredicted the pressure drop data. The flow regimes were observed for high gas superficial velocities (U GS e"10 m/s). There were three flow regimes and two transition regions observed in the 3 mm test section, which were in fairly good agreement with the experimental data obtained by Damianides (1987). There were two flow regimes and one transition region observed in both the 1 mm and the 0.8 mm test sections. Finally, the transition region from the annular to the dispersed flow regime in the 0.8 mm test section occurred when the superficial water velocity was approximately 0.9 m/s, which coincides with the results obtained in the 1 mm test tube. A 3CCD analog camera was used for the visualization of images in the present study. (Abstract shortened by UMI.).
Author: Younghoon Kwak
Publisher:
ISBN:
Category : Microfluidics
Languages : en
Pages : 334
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Two-phase gas-liquid flows in microscale fractal-like branching channel flow networks were experimentally studied to assess the validity of existing void fraction correlations and flow regimes based on superficial gas and liquid velocities. Void fractions were assessed using two different methods. First, void fraction data were acquired using a High-Speed-High-Resolution (HSHR) camera and computed by area-based two-dimensional image analysis. Void fraction data were also computed using a slip ratio, defined as gas velocity over liquid velocity. Liquid velocity represents the bulk-averaged liquid velocity as determined by microscale particle image velocimetry (micro-PIV). Gas velocity was determined by averaging gas-liquid interface velocities made at the channel centerline. The fractal-like branching channel flow network has five bifurcation levels of different channel widths varying from 400 [mu]m to 100 [mu]m with a fixed channel depth of 250 [mu]m. Each downstream width decreases by 30% whereas the downstream lengths increase by 40%. The total flow length through a single path is approximately 18 mm. Filtered air and deionized water were used as the gas and liquid working fluids, respectively. Mass flow rates of air and water into each k=0 branch were varied from 0.3 g/min to 2.5 g/min and from 5.2x10−5 g/min to 1.3x10−2 g/min, respectively. These flow rates yielded superficial air and water velocities through the same branch level between 0.007 m/s and 1.8 m/s and between 0.05 m/s and 0.42 m/s, respectively. For each branching level, due to an increase in flow area, the superficial liquid and gas flow rates change. A two-phase flow regime map was generated for each level of the fractal-like branching flow network and compared to maps developed using the Taitel and Dukler (1976) model and to maps presented in Chung and Kawaji (2004). Flow regime transitions are well predicted with the Taitel and Dukler (1976) model for each branching level. Void fraction assessed using the slip ratio shows very good agreement with the homogeneous void fraction model for all branching levels. On the other hand, void fraction determined by area-based two-dimensional image analysis shows better agreement with the void fraction correlation of Zivi (1964).
Author: Volfango Bertola
Publisher: CISM International Centre for Mechanical Sciences
ISBN:
Category : Science
Languages : en
Pages : 450
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Book Description
This is an up-to-date review of recent advances in the study of two-phase flows, with focus on gas-liquid flows, liquid-liquid flows, and particle transport in turbulent flows. The book is divided into several chapters, which after introducing basic concepts lead the reader through a more complex treatment of the subjects. The reader will find an extensive review of both the older and the more recent literature, with abundance of formulas, correlations, graphs and tables. A comprehensive (though non exhaustive) list of bibliographic references is provided at the end of each chapter. The volume is especially indicated for researchers who would like to carry out experimental, theoretical or computational work on two-phase flows, as well as for professionals who wish to learn more about this topic.
Author: Vicente Casariego
Publisher:
ISBN:
Category : Drilling muds
Languages : en
Pages : 290
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Book Description
Abstract.
Author: Thomas James Crawford
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Author: Shaw-Yaw Kang
Publisher:
ISBN:
Category :
Languages : en
Pages : 244
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Author: Shaw-Yaw Kang
Publisher:
ISBN:
Category :
Languages : en
Pages : 244
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Author: Howard Dale Beggs
Publisher:
ISBN:
Category : Gas flow
Languages : en
Pages : 126
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Author: Sadik Kakaç
Publisher: Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 1268
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Book Description
Very Good,No Highlights or Markup,all pages are intact.
