Experimental Studies For Two Phase Bubbly Flow Interfacial Parameters In A Horizontal Channel
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Modelling and Experimentation in Two-Phase Flow
| Author | : Volfango Bertola |
| Publisher | : Springer |
| Total Pages | : 433 |
| Release | : 2014-05-04 |
| Genre | : Technology & Engineering |
| ISBN | : 3709125383 |
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.
Geometric Effects of Flow Restrictions and Configurations on Interfacial Structures in Two-phase Flow
| Author | : Mohan Singh Yadav |
| Publisher | : |
| Total Pages | : 193 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
This study investigates the geometric effects of flow restrictions and flow configurations on two-phase flow parameters. Experiments are conducted in two distinct experimental setups employing different flow configurations and flow restrictions. In the first experiment, comparison of the effects of 90-degree and 45-degree elbows on interfacial structures and their transport characteristics in horizontal two-phase bubbly flow is investigated. The setup is made out of 50.3 mm inner diameter glass tubes and a double-sensor conductivity probe is used to collect time averaged local data. Experimental results show that both elbows have significant effect on the development of interfacial structures as well as the bubble interaction mechanisms. Furthermore, there are characteristic similarities and differences between the effects of two elbows. While the effect of the 45-degree elbow is evident immediately after the elbow, the 90-degree elbow effect is propagated further downstream of the elbow. Moreover, it is shown that both the elbows induce oscillations in the interfacial structures and two-phase flow parameters, but the degree and the nature of oscillation differ. Comparison of the elbow effect on the axial transport of two-phase flow parameters is also investigated. The second set of experiments is performed in combinatorial two-phase flow facility to study the effects of 90-degree vertical elbow and geometric configuration on two-phase bubbly flow. The elbow has a significant effect on two-phase flow regime transition boundaries at measurement locations downstream of the elbow. Modified two-phase flow regime maps based on the extensive flow visualization studies are suggested for both vertical and horizontal test sections. A four-sensor conductivity probe is employed to measure time averaged two-phase local parameters as the flow develops along vertical upward to horizontal section across the 90-degree vertical elbow. The elbow causes the bubbles to align along the horizontal radius of the pipe cross-section, creating a bi-peaked profile in void fraction and interfacial area concentration. One dimensional transport of area averaged two-phase flow parameters shows that the elbow promotes bubble interaction mechanism.
Measurements of Interfacial Area Concentration in Two-phase Bubbly Flow
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2001 |
| Genre | : |
| ISBN | : |
Interfacial area concentration is an important parameter in the two-fluid model for two-phase flow analysis, which is defined as the total interface area per unit mixture volume and has the following local time-averaged expression:[bar a][sup t]= 1/[Delta]T[Sigma][sub j](1/[vert-bar]V[sub i][center-dot] n[sub i][vert-bar])[sub j], where j denotes the j-th interface that passes the point of interest in a time interval[Delta]T. V[sub i] and n[sub i] refer to the bubble interface velocity and surface normal vector, respectively. To measure this parameter, the double-sensor probe technique is commonly used. Due to the influences of the bubble lateral motions, however, the measurement results should be interpreted via a certain statistic approach. Recently, to take into account the effects of the probe spacing, Wu and Ishii provided the following new formula to correlate the measurable values to the interfacial area concentration:[bar a][sub i][sup t]= 2N[sub b]/[Delta]T ([Delta][bar t]/[Delta]s)[2+ (1.2[sigma][sub[Delta]t]/[Delta][bar t])[sup 2.25]], for D= 1.2[approximately] 2.8[Delta]s, where N[sub b] refers to the number of the bubbles that hit the probe front tip during time interval[Delta]T, [Delta]s denotes the distance between the two probe tips, D is the bubble diameter, [Delta][bar t] represents the measured average time interval for an interface to travel through the two probe tips, and[sigma][sub[Delta]t] is the standard deviation of[Delta]t. The theoretical accuracy of this formula is within[+-] 5% if the sample size is sufficiently large. The purpose of this study is to evaluate this method experimentally using an image processing method.
Interfacial Area and Interfacial Transfer in Two-phase Flow Systems
| Author | : |
| Publisher | : |
| Total Pages | : 5 |
| Release | : 1992 |
| Genre | : |
| ISBN | : |
Experiments were performed on horizontal air-water bubbly two-phase flow, axial flow, stratified wavy flow, and annular flow. Theoretical studies were also undertaken on interfacial parameters for a horizontal two-phase flow. (DLC).
Interfacial Structures of Confined Air-water Two-phase Bubbly Flow
| Author | : |
| Publisher | : |
| Total Pages | : 25 |
| Release | : 2000 |
| Genre | : |
| ISBN | : |
The interfacial structure of the two-phase flows is of great importance in view of theoretical modeling and practical applications. In the present study, the focus is made on obtaining detailed local two-phase parameters in the air-water bubbly flow in a rectangular vertical duct using the double-sensor conductivity probe. The characteristic wall-peak is observed in the profiles of the interracial area concentration and the void fraction. The development of the interfacial area concentration along the axial direction of the flow is studied in view of the interfacial area transport and bubble interactions. The experimental data is compared with the drift flux model with C0 = 1.35.
Thermo-fluid Dynamics of Two-Phase Flow
| Author | : Mamoru Ishii |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 462 |
| Release | : 2006-09-28 |
| Genre | : Technology & Engineering |
| ISBN | : 0387291873 |
This book has been written for graduate students, scientists and engineers who need in-depth theoretical foundations to solve two-phase problems in various technological systems. Based on extensive research experiences focused on the fundamental physics of two-phase flow, the authors present the detailed theoretical foundation of multi-phase flow thermo-fluid dynamics as they apply to a variety of scenarios, including nuclear reactor transient and accident analysis, energy systems, power generation systems and even space propulsion.
Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume IV. Chapters 15-19).
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2003 |
| Genre | : |
| ISBN | : |
Experiments were performed on horizontal air-water bubbly two-phase flow, axial flow, stratified wavy flow, and annular flow. Theoretical studies were also undertaken on interfacial parameters for a horizontal two-phase flow.
