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**Harvard**

Pettersson, J. (2015) *Numerical Simulations of Subcooled Nucleate Boiling for a Power Electronic Device*. Göteborg : Chalmers University of Technology

** BibTeX **

@mastersthesis{

Pettersson2015,

author={Pettersson, Jonas},

title={Numerical Simulations of Subcooled Nucleate Boiling for a Power Electronic Device},

abstract={The growing demand for power in today’s society require large power grids containing high
power electronic devices, of which ABB is a leading manufacturer. In these devices power losses
inevitably occur, leading to heat generation. The heat eventually causes the device to fail, hence
cooling such devices are of great importance. A way to cool such a system is by liquid cooling
with phase change (subcooled nucleate boiling) as an energy transport phenomenon. To develop
such cooling systems, a mathematical model with a numerical solution procedure is needed to
predict the physical properties.
To achieve this, a literature study has been carried out to formulate a closed mathematical
system, describing this problem. The formulated model is based on previously verified models
for boiling properties, such as bubble diameters, wall super heat, heat flux, mass transfer due to
evaporation and condensation. These models were combined with a new approach to calculate
wall temperature. The new wall temperature was introduced to save computational time, since
this often is an issue when implementing these types of models.
A case with existing experimental data, found in the literature study, was simulated and
the results were compared with varying agreement. The vapour content proved to be under
predicted by the model and the introduced wall temperature model gave over predicted results.
Good agreement could be seen of the evaporation heat fluxes with some dependency of the bubble
diameter in the system. Despite over and under predictions, the trends of several properties
agreed with the reference data. The developed solver also performed stable computations and
was well documented, preparing it for future development.
KEYWORDS: CFD, OpenFOAM, subcooled nucleate boiling flow, wall temperature,
bubble diameter model, heat flux partitioning, cooling},

publisher={Institutionen för matematiska vetenskaper, Chalmers tekniska högskola},

place={Göteborg},

year={2015},

note={85},

}

** RefWorks **

RT Generic

SR Electronic

ID 213481

A1 Pettersson, Jonas

T1 Numerical Simulations of Subcooled Nucleate Boiling for a Power Electronic Device

YR 2015

AB The growing demand for power in today’s society require large power grids containing high
power electronic devices, of which ABB is a leading manufacturer. In these devices power losses
inevitably occur, leading to heat generation. The heat eventually causes the device to fail, hence
cooling such devices are of great importance. A way to cool such a system is by liquid cooling
with phase change (subcooled nucleate boiling) as an energy transport phenomenon. To develop
such cooling systems, a mathematical model with a numerical solution procedure is needed to
predict the physical properties.
To achieve this, a literature study has been carried out to formulate a closed mathematical
system, describing this problem. The formulated model is based on previously verified models
for boiling properties, such as bubble diameters, wall super heat, heat flux, mass transfer due to
evaporation and condensation. These models were combined with a new approach to calculate
wall temperature. The new wall temperature was introduced to save computational time, since
this often is an issue when implementing these types of models.
A case with existing experimental data, found in the literature study, was simulated and
the results were compared with varying agreement. The vapour content proved to be under
predicted by the model and the introduced wall temperature model gave over predicted results.
Good agreement could be seen of the evaporation heat fluxes with some dependency of the bubble
diameter in the system. Despite over and under predictions, the trends of several properties
agreed with the reference data. The developed solver also performed stable computations and
was well documented, preparing it for future development.
KEYWORDS: CFD, OpenFOAM, subcooled nucleate boiling flow, wall temperature,
bubble diameter model, heat flux partitioning, cooling

PB Institutionen för matematiska vetenskaper, Chalmers tekniska högskola,

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/213481/213481.pdf

OL 30