The present Volume 4 of the successful monograh package
Multiphase Flow Dynamics is devoted to selected Chapters of the
multiphase fluid dynamics that are important for practical
applications but did not find place in the previous volumes. The
state of the art of the turbulence modeling in multiphase flows is
presented. As introduction, some basics of the single phase
boundary layer theory including some important scales and flow
oscillation characteristics in pipes and rod bundles are presented.
Then the scales characterizing the dispersed flow systems are
presented. The description of the turbulence is provided at
different level of complexity: simple algebraic models for eddy
viscosity, simple algebraic models based on the Boussinesq
hypothesis, modification of the boundary layer share due to
modification of the bulk turbulence, modification of the boundary
layer share due to nucleate boiling. The role of the following
forces on the mathematical description of turbulent flows is
discussed: the lift force, the lubrication force in the wall
boundary layer, and the dispersion force. A pragmatic
generalization of the k-eps models for continuous velocity field is
proposed containing flows in large volumes and flows in porous
structures. A Methods of how to derive source and sinks terms for
multiphase k-eps models is presented. A set of 13 single- and two
phase benchmarks for verification of k-eps models in system
computer codes are provided and reproduced with the IVA computer
code as an example of the application of the theory. This
methodology is intended to help other engineers and scientists to
introduce this technology step-by-step in their own engineering
practice.
In many practical application gases are solved in liquids under
given conditions, released under other conditions and therefore
affecting technical processes for good of for bad. Useful
information on the solubility of oxygen, nitrogen, hydrogen and
carbon dioxide in water under large interval of pressures and
temperatures is collected, and appropriate mathematical
approximation functions are provided. In addition methods for the
computation of the diffusion coefficients are described. With this
information solution and dissolution dynamics in multiphase fluid
flows can be analyzed. For this purpose the non-equilibrium
absorption and release on bubble, droplet and film surfaces under
different conditions is mathematically described.
A systematic set of internally consistent state equations for
diesel fuel gas and liquid valid in broad range of changing
pressure and temperature is provided.
This new second edition includes various updates, extensions,
improvements and corrections.
In many practical application gases are solved in liquids under
given conditions, released under other conditions and therefore
affecting technical processes for good of for bad. Useful
information on the solubility of oxygen, nitrogen, hydrogen and
carbon dioxide in water under large interval of pressures and
temperatures is collected, and appropriate mathematical
approximation functions are provided. In addition methods for the
computation of the diffusion coefficients are described. With this
information solution and dissolution dynamics in multiphase fluid
flows can be analyzed. For this purpose the non-equilibrium
absorption and release on bubble, droplet and film surfaces under
different conditions is mathematically described.
A systematic set of internally consistent state equations for
diesel fuel gas and liquid valid in broad range of changing
pressure and temperature is provided.
This new second edition includes various updates, extensions,
improvements and corrections.
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