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2021 | OriginalPaper | Buchkapitel

2. Fundamentals

verfasst von : Fabio Toshio Kanizawa, Gherhardt Ribatski

Erschienen in: Flow boiling and condensation in microscale channels

Verlag: Springer International Publishing

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Abstract

General aspects related to the fundamentals of two-phase flow and flow boiling and condensation, necessary for the development of the next chapters, are detailed in this chapter.

The main parameters related to two-phase flow are defined, focusing on conditions of liquid and vapor simultaneous flow, such as characterization and definition of flow patterns, and phases velocities and fractions.

A discussion about void fraction is also addressed, presenting the main predictive models and methods in a didactical way, finishing with a comparison among the methods.

This chapter also presents discussions about fundamental aspects of flow boiling and condensation, describing the flow topology evolution during the phase change process.

It also presents the methods to characterize channels according to its size as micro or macroscale according to distinct approaches.

After finishing this chapter, the student should be able to understand the main parameters that characterize multiphase flows, with and without heat transfer, as well as be able to select a proper method for void fraction estimation. Additionally, the reader should have a general idea of the variation of flow characteristics during flow boiling and condensation along a channel.

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Vorheriges Kapitel Introduction

Nächstes Kapitel Flow Patterns

This presentation is slightly different than the original description, which is based on weighted averages of the two-phase parameters, but the final relationship for void fraction is exactly the same.

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Titel: Fundamentals
verfasst von: Fabio Toshio Kanizawa
Gherhardt Ribatski
Verlag: Springer International Publishing
Buch: Flow boiling and condensation in microscale channels
Print ISBN: 978-3-030-68703-8

Electronic ISBN: 978-3-030-68704-5

Copyright-Jahr: 2021
DOI: https://doi.org/10.1007/978-3-030-68704-5_2

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