An Experimental And Numerical Investigation Of Two Phase Slug Flow In A Vertical Tube
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An Experimental and Numerical Investigation of Two-phase Slug Flow in a Vertical Tube
The multi-dimensional liquid velocity field and interfacial configuration of Taylor bubbles rising in stagnant kerosene in a vertical 25.6 mm I.D. pipe was investigated experimentally with a non-intrusive flow visualization technique based on photochromic dye activation, and numerically using a computer program for incompressible flows with free surfaces. The experimental results show that a change in flow direction of the liquid occurred at the nose of the Taylor bubble. From the nose, the liquid film accelerated downwards as the velocity profile became characteristic of developing falling film flow. At the tail, the liquid film penetrated into the wake creating vortices of different sizes. The film penetration distance in the wake region was not proportional to the film velocity, and therefore the bubble length. Within 1 to 1.5 tube diameters (26-38 mm) below the tail of the Taylor bubble, the vortices rapidly decayed and the liquid near the wall returned to essentially a stagnant state. However, small vortices in the bulk fluid remained visible up to 100 mm behind the Taylor bubble. An analysis of the flow revealed the liquid film surrounding the neatly cylindrical portion of the Taylor bubble to be approximately one-dimensional, whereas near the nose and in the wake it was highly two-dimensional. Furthermore, the velocity in the wake region was determined to be qualitatively similar for different runs. A simple predictive procedure for estimating the radially averaged streamwise film velocity and Taylor bubble shape concluded that the boundary-layer development at the pipe wall only influenced the falling film velocity. The numerical simulation of the Taylor bubble flow was conducted using the volume-of-fluid approach. However, the range of physical property values that yielded stable numerical results for the inertia-controlled rise of the bubble was severely limited, due to significant stability problems. The Taylor bubble shape was well predicted and velocity profiles in the liquid surrounding the Taylor bubble were computed with partial success for the first time in comparison with measured results. The flow in the wake was only qualitatively similar to the experimental data.
Proceedings of the 1st International Conference on Numerical Modelling in Engineering
This book gathers outstanding papers on numerical modeling in Mechanical Engineering (Volume 2) as part of the proceedings of the 1st International Conference on Numerical Modeling in Engineering (NME 2018), which was held in Ghent, Belgium. The overall objective of the conference was to bring together international scientists and engineers in academia and industry from fields related to advanced numerical techniques, such as the finite element method (FEM), boundary element method (BEM), isogeometric analysis (IGA), etc., and their applications to a wide range of engineering disciplines. This book addresses various industrial engineering applications of numerical simulations to Mechanical and Materials Engineering, including: Aerospace applications, Acoustic analysis, Biomechanical applications, Contact problems and wear, Heat transfer analysis, Vibration and dynamics, Transient analysis, Nonlinear analysis, Composite materials, Polymers, Metal alloys, Fracture mechanics, Fatigue of materials, Creep behavior, Phase transformation, and Crystal plasticity.
Proceedings of the 1st International Conference on Advances in Aerospace and Navigation Systems - 2024
This book contributes to the advancement of aerospace technology and the optimization of navigation systems, thereby fostering innovation and progress in the field. The "Proceedings of the 1st International Conference on Advances in Aerospace and Navigation Systems 2024" captures a comprehensive exploration of groundbreaking research and advancements in the fields of Aerospace and Navigation. Encompassing Aerodynamics, Propulsion, Structures, Navigation, Communication, and Artificial Intelligence, these proceedings investigate the details of each domain, providing readers with a thorough understanding of the latest developments and methodologies. One of the distinguishing features of this book is its international perspective. With contributions from esteemed experts hailing from different corners of the globe, these proceedings foster a global dialogue, facilitating cross-cultural insights and collaboration. Through planetary talks and keynote addresses, readers gain access to the wisdom and expertise of renowned speakers, enhancing their comprehension of critical topics shaping the future of aerospace and navigation systems. The conference proceedings offer a platform for in-depth exploration and analysis, addressing many of the themes such as aerodynamic design, propulsion systems, structures, navigation techniques, communication systems, and the integration of artificial intelligence in aerospace applications. Furthermore, these proceedings serve as a repository of state-of-the-art research, providing readers with access to cutting-edge studies and innovative approaches. This book offers a wealth of knowledge and insights for scholars, practitioners, and students alike. In addition to its academic significance, these proceedings hold practical relevance for industry professionals and policymakers. In summary, the "Proceedings of the 1st International Conference on Advances in Aerospace and Navigation Systems 2024" stands as a testament to the collective efforts of the global aerospace community. With its comprehensive coverage, international perspective, and commitment to excellence, this book promises to be an invaluable resource for anyone invested in the future of aerospace and navigation technology.