The Library
Melting and solidification models and thermal characteristics of microencapsulated phase change materials
Tools
Yang, Jia (Researcher in engineering) (2013) Melting and solidification models and thermal characteristics of microencapsulated phase change materials. PhD thesis, University of Warwick.
|
Text
WRAP_THESIS_Yang_J_2013.pdf - Submitted Version Download (2442Kb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b2691345~S1
Abstract
Microencapsulated phase change material (MPCM) as a new thermal
energy storage material and a heat transfer medium have attracted
considerable attention in the thermal energy storage field.
Solidification and melting models of a single PCM particle are constructed
in this thesis. An effective numerical method for the problem of a spherical
particle with a moving boundary was developed and validated by an iterative
analytical series solution.
A new liquid-solid interface model was proposed for modelling the effect of
binary phase composition on the solidification of an alloy and a mixture PCM
particle based on solid fraction. A full two-phase melting model of differentlysized
micro/nano particles was also built. The initial melting point of particles
is defined and depends on the minimum melting temperature of particles
measured by DSC, the particle size and the Gibbs-Thomson equation. The
model can predict the melting time of micro-particles flowing in a heat
transfer channel, which agrees with the group melting behaviour of MPCM as
observed by experiments.
A test rig was built to explore the melting heat transfer behaviour of
microcapsule phase change slurry (MPCS) flowing through a circular tube for
a given constant heat flux.
DPNT06-0182 slurries were investigated on the test rig. The experimental
results indicate that the flow rate is a key factor in determining heat transfer
coefficients of slurries. For the same energy efficiency, and in the situation of
low flow rate and phase change, the pressure drop and local heat transfer
coefficients of 10% DPNT slurry are lower compared with water, but the most
heat energy is stored during the passage through the heated test section.
However, in the case of high flow rates and no phase change, the local heat
transfer coefficients of 10% DPNT slurry are higher with comparison to water
under turbulent flows.
Item Type: | Thesis (PhD) | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TS Manufactures |
||||
Library of Congress Subject Headings (LCSH): | Microencapsulation, Energy storage, Materials -- Thermal properties, Solid-liquid interfaces -- Mathematical models, Heat -- Transmission | ||||
Official Date: | March 2013 | ||||
Dates: |
|
||||
Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Hutchins, David A.; Zhao, Chang-Ying | ||||
Sponsors: | Engineering and Physical Sciences Research Council (EPSRC); University of Warwick | ||||
Extent: | xxiii, 194 leaves : illustrations, charts. | ||||
Language: | eng |
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year