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Internal Structure And Interfacial Area In Two Phase Flow Systems
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Book Synopsis Internal Structure and Interfacial Area in Two-phase Flow Systems by :
Download or read book Internal Structure and Interfacial Area in Two-phase Flow Systems written by and published by . This book was released on 1991 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interfacial transfer terms and the importance of the interfacial area concentration are reviewed first with respect to the two-fluid model formulation of two-phase flow systems. Then the available measurement techniques for interfacial area are reviewed. At present, it appears that various methods such as the chemical, light attenuation, photographic, ultrasound attenuation and probe techniques have a number of limitations. Among these measurement techniques, however, the local probe method using one or more double sensors seems to have the greatest potential in terns of accuracy and wider applicability in various two-phase flow patterns. From the brief review of existing interfacial area modeling methods, it is concluded that the conventional approaches might not be sufficient, and new directions are indicated. Recent experimental results on local interfacial structural characteristics of horizontal bubbly two-phase flow and internal flow structure development are presented. More specifically, experimental results on local void fraction, interfacial area concentration, bubble size, bubble interface velocity and bubble frequency are documented in detail. Finally, a theoretical model predicting the mean bubble size and interfacial area concentration is proposed. The theoretically predicted bubble size and interfacial area concentration are found to agree reasonably well with those measured by using a double-sensor resistivity technique.
Book Synopsis Interfacial Area and Two-phase Flow Structure Development Measured by a Double-sensor Probe by :
Download or read book Interfacial Area and Two-phase Flow Structure Development Measured by a Double-sensor Probe written by and published by . This book was released on 1992 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report, we studied the local phasic characters of dispersed flow regime both at the entrance and at the fully developed regions. Since the dispersed phase is distributed randomly in the medium and enclosed in relatively small interfaces, the phasic measurement becomes difficult to obtain. Local probe must be made with a miniaturized sensor in order to reduce the interface distortion. The double-sensor resistivity probe has been widely used in local void fraction and interface velocity measurements because the are small in comparison with the interfaces. It has been tested and proved to be an accurate local phasic measurement tool. In these experiments, a double-sensor probe was employed to measure the local void fraction and interface velocity in an air-water system. The test section was flow regime can be determined by visualization. Furthermore, local phasic measurements can be verified by photographic studies. We concentrated our study on the bubbly flow regime only. The local measurements were conducted at two axial locations, L/D = 8 and 60, in which the first measurement represents the entrance region where the flow develops, and the second measurement represents the fully developed flow region where the radial profile does not change as the flow moves along the axial direction. Four liquid flow rates were chosen in combination with four different gas injection rates. The superficial liquid velocities were j{sub t} = 1.0, 0.6,0.4, and 0.1 m/s and superficial gas velocities were j{sub g} = 0.0965, 0.0696, 0.0384, and 0.0192 m/s. These combinations put the two-phase flow well in the bubbly flow regime. In this sequence of phenomenological studies, the local void fraction, interface area concentration, sauter mean diameter, bubble velocity and bubble frequency were measured.
Book Synopsis Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume I. Chapters 1-5). by :
Download or read book Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume I. Chapters 1-5). written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Interfacial Area and Interfacial Transfer in Two-phase Flow Systems by :
Download or read book Interfacial Area and Interfacial Transfer in Two-phase Flow Systems written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume II. Chapters 6-10). by :
Download or read book Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume II. Chapters 6-10). written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume IV. Chapters 15-19). by :
Download or read book Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume IV. Chapters 15-19). written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume III. Chapters 11-14). by :
Download or read book Interfacial Area and Interfacial Transfer in Two-Phase Flow Systems (Volume III. Chapters 11-14). written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Interfacial Area and Interfacial Transfer in Two-phase Flow Systems. Annual Technical Progress Report, 1991--1992 by :
Download or read book Interfacial Area and Interfacial Transfer in Two-phase Flow Systems. Annual Technical Progress Report, 1991--1992 written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Two-Phase Flow, Boiling, and Condensation by : S. Mostafa Ghiaasiaan
Download or read book Two-Phase Flow, Boiling, and Condensation written by S. Mostafa Ghiaasiaan and published by Cambridge University Press. This book was released on 2017-01-11 with total page 1322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a comprehensive introduction to the fundamentals and applications of flow and heat transfer in conventional and miniature systems, this fully enhanced and updated edition covers all the topics essential for graduate courses on two-phase flow, boiling, and condensation. Beginning with a concise review of single-phase flow fundamentals and interfacial phenomena, detailed and clear discussion is provided on a range of topics, including two-phase hydrodynamics and flow regimes, mathematical modeling of gas-liquid two-phase flows, pool and flow boiling, flow and boiling in mini and microchannels, external and internal-flow condensation with and without noncondensables, condensation in small flow passages, and two-phase choked flow. Numerous solved examples and end-of-chapter problems that include many common design problems likely to be encountered by students, make this an essential text for graduate students. With up-to-date detail on the most recent research trends and practical applications, it is also an ideal reference for professionals and researchers in mechanical, nuclear, and chemical engineering.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two-Phase Flows written by Shih-i Pai and published by Springer-Verlag. This book was released on 2013-07-02 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermo-fluid Dynamics of Two-Phase Flow by : Mamoru Ishii
Download or read book Thermo-fluid Dynamics of Two-Phase Flow written by Mamoru Ishii and published by Springer Science & Business Media. This book was released on 2006-09-28 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Geometric Effects of Flow Restrictions and Configurations on Interfacial Structures in Two-phase Flow by : Mohan Singh Yadav
Download or read book Geometric Effects of Flow Restrictions and Configurations on Interfacial Structures in Two-phase Flow written by Mohan Singh Yadav and published by . This book was released on 2009 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Simulations of Two-phase Flows Using Interfacial Area Transport Equation by : Xia Wang
Download or read book Simulations of Two-phase Flows Using Interfacial Area Transport Equation written by Xia Wang and published by . This book was released on 2010 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The current study focuses on providing a reliable computational fluid dynamics (CFD) tool for two-phase flow simulations, which is capable of capturing dynamic changes of interfacial structures and achieving accurate predictions of flow behaviors. A set of interfacial area transport equations (IATEs), which dynamically evaluates the interfacial area concentration, was successfully implemented into a CFD software package, namely, Fluent. The interfacial area concentration is a key parameter in modeling the interfacial transfer terms in the two-fluid model due to mechanical and thermal non-equilibrium between the two phases. Given the various flow regimes in two-phase flows, one-group IATE and two-group IATE developed in the literature were separately incorporated into the two-fluid model and subsequently validated under different flow conditions: liquid-liquid two-component bubbly; air-water bubbly, cap-bubbly, and churn-turbulent flows. Numerical results obtained from the two-fluid model incorporated with the IATE models were generally in good agreement with the experimental data. A set of adjustable model coefficients was also established for three-dimensional simulations when the influence of the lateral phase distribution in a circular flow channel on the one-group IATE model was considered. In addition, contributions of the bubble interaction mechanisms and interfacial forces to the phase distributions of two-phase flow were numerically investigated. It was observed that the lift force was significant for the phase distributions in gas-liquid two-phase flows; however it might cause convergence issues when large bubbles exist in the flow field of interest. Furthermore, a mathematical property, i.e., the well-posedness of the proposed one-dimensional three-field model with the two-group IATE model, was studied. The necessary condition to ensure well-posedness was obtained using characteristic analysis. The momentum flux parameters were introduced to help stabilize the proposed model.
Book Synopsis Convective Boiling and Condensation by : John G. Collier
Download or read book Convective Boiling and Condensation written by John G. Collier and published by Clarendon Press. This book was released on 1994-05-19 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Third edition of a well-known and well established text both in industry and for teaching * Fully up-to-date and includes extra problems This book is an aid to heat exchanger design written primarily for design and development engineers in the chemical process, power generation, and refrigeration industries. It provides a comprehensive reference on two-phase flows, boiling, and condensation. The text covers all the latest advances like flows over tube bundles and two-phase heat transfer regarding refrigerants and petrochemicals. Another feature of this third edition is many new problems at chapter ends to enhance its use as a teaching text for graduate and post-graduate courses on two-phase flow and heat transfer. - ;This book is written for practising engineers as a comprehensive reference on two-phase flows, boiling, and condensation. It deals with methods for estimating two-phase flow pressure drops and heat transfer rates. It is a well-known reference book in its third edition and is also used as a text for advanced university courses. Both authors write from practical experience as both are professional engineers. -
Book Synopsis Local Phase Distribution and Interfacial Area in a Horizontal Bubbly Two-phase Flow by :
Download or read book Local Phase Distribution and Interfacial Area in a Horizontal Bubbly Two-phase Flow written by and published by . This book was released on 1991 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
