dc.contributor.advisor |
Bandara PMT |
|
dc.contributor.advisor |
Ranasinghe RACP |
|
dc.contributor.author |
Siriwardana SSGC |
|
dc.date.accessioned |
2022 |
|
dc.date.available |
2022 |
|
dc.date.issued |
2022 |
|
dc.identifier.citation |
Siriwardana, S.S.G.C. (2022). Numerical study of microchannel heat transfer with nanofluid based two - phase slug flow [Master's theses, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.uom.lk/handle/123/20934 |
|
dc.identifier.uri |
http://dl.lib.uom.lk/handle/123/20934 |
|
dc.description.abstract |
Microfluidics has recently gained research attention for its high-end thermal
applications, including micro heat exchangers, Lab on a Chip, micro reactors, and
MEMS. It has been proven that the addition of suitable nanoparticles to a fluid can
enhance the heat transfer efficiency in microchannels, both in single phase and
liquid-liquid two-phase flow. In general, slug flow is said to be the most efficient in
heat transfer. However, the investigation performed on liquid-liquid slug flow with
added nanoparticles was found to be very limited. Hence, this study numerically
investigates the heat transfer characteristics in microchannels with liquid-liquid two-
phase fluid flow (water and light mineral oil) with added nano particles (AI2O3).
The VOF method and phase field equations were solved using ANSYS Fluent and
COMSOL Multiphysics to capture two-phase flow interfaces. Adaptive mesh
refinement techniques were employed to reduce computational power while
maintaining sharp interfaces between fluid phases. The Eulerian mixture model was
used
to solve the cases containing nanoparticles. Numerical results were validated
against published experimental data reported by [1] and [2].
Simulations were conducted for a 3000 micron long microchannel with a diameter of
100 microns for fluid velocity, ranging from 0.1 m/s to 0.5 m/s. First, 1 kW/cm2 of
heat flux is introduced to the channel wall after 1000 microns to mimic the microchip
heat generation, also allowing flow to be developed.
Results have shown that using nanoparticles in either phase significantly increases
heat transmission. This can be amplified even more when used in the secondary
phase, by 58 percent compared with liquid-liquid two phase slug flow. This was
accomplished with a nanoparticle fraction of 0.05 v/v in the secondary fluid phase.
The addition of nanoparticles to the primary fluid increased heat transfer by 34%. The
findings of this study can be used to improve MEMS and micro-to-macro systems that
move heat. |
en_US |
dc.language.iso |
en |
en_US |
dc.subject |
HEAT TRANSFER |
en_US |
dc.subject |
MICRO CHANNELS |
en_US |
dc.subject |
NANO PARTICLES |
en_US |
dc.subject |
NANO FLUIDS |
en_US |
dc.subject |
ENERGY TECHNOLOGY– Dissertation |
en_US |
dc.subject |
MECHANICAL ENGINEERING– Dissertation |
en_US |
dc.title |
Numerical study of microchannel heat transfer with nanofluid based two - phase slug flow |
en_US |
dc.type |
Thesis-Abstract |
en_US |
dc.identifier.faculty |
Engineering |
en_US |
dc.identifier.degree |
M.Eng. in Energy Technology |
en_US |
dc.identifier.department |
Department of Mechanical Engineering |
en_US |
dc.date.accept |
2022 |
|
dc.identifier.accno |
TH4794 |
en_US |