Evaluation of Micromixing Models for Turbulent Mixing in Supercritical Water

Title

Evaluation of Micromixing Models for Turbulent Mixing in Supercritical Water

 Author

Koene, Michael (TU Delft Applied Sciences; TU Delft Electrical Engineering, Mathematics and Computer Science)

Contributor

Roekaerts, Dirk (mentor)
Heemink, Arnold (mentor)
Pecnik, Rene (graduation committee)
Redig, Frank (graduation committee)

Degree granting institution

Delft University of Technology

 Date

2018-07-11

 Abstract

Hydrothermal flames have become a very important field of study, especially for supercritical water oxidation. In supercritical water oxidation hazardous, toxic or non-biodegradable aqueous organic waste water streams can be efficiently destructed. Supercritical water oxidation takes place in a aqueous environment above the supercritical point.

In the case of turbulent flow, micromixing models are needed.
In this work, three different mixing models are analysed in a hydrothermal flame environment. These models are Interaction by Exchange with the Mean, Coalescence/Dispersion and the Mapping Closure model. When the mixing is done around temperatures far below or far above the pseudocritical temperature all models gave the same evolution of average temperature. However when the mixing is done around the pseudocritical temperature the differences are large. The Mapping Closure model is best in agreement with the Navier-Stokes equations so it is advised to use that model when simulating mixing around the pseudocritical temperature.

 Subject

Hydrothermal flames
supercritical water
micromixing
Interaction by exchange with the mean
Coalescence/Dispersion
Mapping Closure

 To reference this document use:

http://resolver.tudelft.nl/uuid:8ae6954d-10f2-408a-a53a-80f46ba232d8

 Part of collection

Student theses

 Document type

bachelor thesis

 Rights

© 2018 Michael Koene
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