University of Jyväskylä | JYX Digital Repository

  • English  | Give feedback |
    • suomi
    • English
 
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.
View Item 
  • JYX
  • Opinnäytteet
  • Väitöskirjat
  • View Item
JYX > Opinnäytteet > Väitöskirjat > View Item

In-plane conductive heat tansfer in solid and porous planar structures

Thumbnail
View/Open
3.9 Mb

Downloads:  
Show download detailsHide download details  
Published in
Research report / Department of Physics, University of Jyväskylä
Authors
Miettinen, Lasse
Date
2011
Discipline
Fysiikka

 
Methods for determining the in-plane thermal diffusivity in a planar sample geometry were developed. These methods were tested and verified by measuring planar metal samples with known thermal properties. The techniques used were based on heating the sample at one edge and recording the evolution of the temperature field in the sample by a thermographic camera. The temperature fields at different times were processed and then fitted by a solution to a heat equation describing the experimental setup, thermal diffusivity as one of the fitting parameters. In the first experimental setup the sample was placed in a weak constant flow of air, and the situation was improved in the second setup by placing the sample in a vacuum chamber, where convective heat transfer was totally removed. After verification measurements, the latter setup was applied to porous sintered bronze samples, and their effective thermal conductivities were determined. The sintered samples were also imaged by X-ray microtomography so as to obtain a 3D model for their structure. It was shown that the effective thermal conductivity of the samples could be predicted by an analytical expression which involved certain parameters determined from the 3D images. Finally, as another application of the heat equation, propagation of temperature profiles in the form of slow-combustion fronts were studied in sheets of paper. The dynamical properties of these fronts belong to the KPZ universality class, for which theoretical results are available for the height-fluctuation distributions. Height fluctuations for such fronts were determined experimentally, and their distributions were found to be well fitted by corresponding theoretical distributions. ...
Publisher
University of Jyväskylä
ISBN
978-951-39-4580-0
ISSN Search the Publication Forum
0075-465X
Contains publications
  • Artikkeli I: Miettinen, L., Myllys, M., Merikoski, J., & Timonen, J. (2005). Experimental determination of KPZ height-fluctuation distributions. The European Physical Journal B - Condensed Matter and Complex Systems, 46, 55–60. DOI: 10.1140/epjb/e2005-00235-y
  • Artikkeli II: Miettinen, L., Kekäläinen, P., Merikoski, J., Myllys, M., & Timonen, J. (2008). In-plane Thermal Diffusivity Measurement of Thin Samples Using a Transient Fin Model and Infrared Thermography. International Journal of Thermophysics, (29), 1422. DOI: 10.1007/s10765-008-0498-6
  • Artikkeli III: Miettinen, L., Kekäläinen, P., Merikoski, J., & Timonen, J. (2009). Measurement of the In-plane Thermal Diffusivity and Temperature-Dependent Convection Coefficient Using a Transient Fin Model and Infrared Thermography. International Journal of Thermophysics, (30), 1902. DOI: 10.1007/s10765-009-0690-3
  • Artikkeli IV: Miettinen, L., Kekäläinen, P., Turpeinen, T., Hyväluoma, J., Merikoski, J., & Timonen, J. (2012). Dependence of thermal conductivity on structural parameters in porous samples. AIP Advances, 2(1), 12101. DOI: 10.1063/1.3676435
Keywords
thermal diffusivity thermal conductivity thermography slow combustion KPZ equation height fluctuations lämpökamerat lämmön johtuminen lämmön siirtyminen diffuusio
URI

http://urn.fi/URN:ISBN:978-951-39-4580-0

Metadata
Show full item record
Collections
  • Väitöskirjat [3295]

Related items

Showing items with similar title or keywords.

  • Studies of two-dimensional and three-dimensional phononic crystal structures 

    Tian, Yolan (University of Jyväskylä, 2016)
    This thesis focuses on studying phononic crystal structures. More specifically, it is aimed at fabrication and measurement of thermal properties of two-dimensional (2D) periodic microstructures and three-dimensional (3D) ...
  • Computational and theoretical studies on lattice thermal conductivity and thermal properties of silicon clathrates 

    Härkönen, Ville (University of Jyväskylä, 2016)
    The lattice thermal conductivity is usually an intrinsic property in the study of thermoelectricity. In particular, relatively low lattice thermal conductivity is usually a desired feature when higher thermoelectric efficiency ...
  • Numerical simulation of low temperature thermal conductance of corrugated nanofibers 

    Puurtinen, Tuomas (University of Jyväskylä, 2010)
  • Minimizing Coherent Thermal Conductance by Controlling the Periodicity of Two-Dimensional Phononic Crystals 

    Tian, Yaolan; Puurtinen, Tuomas A.; Geng, Zhuoran; Maasilta, Ilari J. (American Physical Society, 2019)
    Periodic hole-array phononic crystals (PnCs) can strongly modify phonon dispersion relations and have been shown to influence thermal conductance coherently, especially at low temperatures where bulk scattering is suppressed. ...
  • Implementing the 3-omega technique for thermal conductivity measurements 

    Hänninen, Tuomas (2013)
    Thermal conductivity of the constituent materials is one of the most important properties affecting the performance of micro- and nanofabricated devices. These devices often make use of thin films with thicknesses ranging ...
  • Browse materials
  • Browse materials
  • Articles
  • Conferences and seminars
  • Electronic books
  • Historical maps
  • Journals
  • Tunes and musical notes
  • Photographs
  • Presentations and posters
  • Publication series
  • Research reports
  • Research data
  • Study materials
  • Theses

Browse

All of JYXCollection listBy Issue DateAuthorsSubjectsPublished inDepartmentDiscipline

My Account

Login

Statistics

View Usage Statistics
  • How to publish in JYX?
  • Self-archiving
  • Publish Your Thesis Online
  • Publishing Your Dissertation
  • Publication services

Open Science at the JYU
 
Data Protection Description

Accessibility Statement

Unless otherwise specified, publicly available JYX metadata (excluding abstracts) may be freely reused under the CC0 waiver.
Open Science Centre