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Local structure of two-phase flows in horizontal ducts

Effects of uniform and suddenly varying duct sections

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Abstract

When considering the flow of a two-phase mixture, the complete characterization of its behavior requires not only the evaluation of its temperature and pressure evolutions, but also the description of the distribution of the phases (the so-called “flow structure”). This is of great importance in problems concerning the analysis of the solicitations undergone by the containing ducts, both from a mechanical point of view and — even more important — when heat transfer at fixed power is involved. In the present paper the description and quantitative visualization of the structure of two-phase flows in horizontal ducts with constant diameter and with section modifications is proposed. The evolution of the flow along the duct is described in local terms by means of section fields of void fraction, flow complexity and local mean temporal length of the gaseous phase. These last are three local, time-averaged quantities which can be easily calculated starting from relatively simple experimental acquisitions of the phase density function.

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Authors and Affiliations

  1. Department of Energy, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy

    Arosio S.

  2. Department of Energy, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy

    Guilizzoni M.

Authors
  1. Arosio S.
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  2. Guilizzoni M.
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Correspondence to Arosio S..

Additional information

Sergio Arosio: He is a full professor of Thermodynamics — Heat and Mass Transfer at Politecnico di Milano (Italy). He graduated in Mechanical Engineering at Politecnico di Milano in 1971. Research area: he has been carrying out researches in the fluid dynamics and energy field with a special attention to: heat exchange in condensation/evaporation in microfin tubes, two-phase flow fluid dynamics in adiabatic contour and non-conventional energy conversion systems. Scientific publications: he is the author of over 100 research papers on the above mentioned fields.

Manfredo Guilizzoni: He received his M.Sc. (Eng.) degree in Industrial Engineering in 1999 from Politecnico di Milano and his Ph.D. in Energy Engineering in 2002 from the same university. He currently is an assistant professor at Politecnico di Milano. His research interests are multiphase fluid dynamics, drop-surface interactions, technical and economic analysis of thermodynamic cycles and computer graphics.

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Arosio, S., Guilizzoni, M. Local structure of two-phase flows in horizontal ducts. J Vis 11, 143–152 (2008). https://doi.org/10.1007/BF03181929

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  • DOI: https://doi.org/10.1007/BF03181929

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