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cfd modelling and experimental study on the fluid flow and heat transfer in copper heat sink design
Mälardalen University, Department of Public Technology.
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Abstract

This thesis is studying the heatsinks new designs for copper heatsinks which utilizes modelling and simulation by CFD, construction of prototypes and experimental works. Challenges and complications in manufacturing of copper heatsinks are expressed and finding the solutions to these hindrances involve in this work. Numerical efforts supported by fluent are made to promote investigation and approaching the goal in which serves the new opportunities for wider application of copper material in heat sinks.

However the thermal conductivity of copper is about double as aluminium but still aluminium heatsinks are commonly used for heat dissipation in computers.

Comparing of heat performance of two analogous heatsink of different materials, aluminium and copper, is conducted by numerical analysis in the CFD environment.

In addition to larger surface area and airflow velocity another solution for enhancement of heat dissipation is suggested.

Manufacturing solutions of copper heatsinks are proposed which will facilitate fabrication of more high performance copper heatsinks than the current heavy and expensive models.

Our first copper heat sink model is designed exclusively based on the technical observations and analyses of numerical simulation of two identical copper and aluminium heatsinks by CFD and as well as manufacturability concerns.

This heat sink is fabricated mechanically and is tested by a number of heat sources and high sensitive devices such as adhesive K type thermocouple, data acquisition 34970A in associated with HP Bench Link program.

An extent experimental work on aluminium heatsinks, integrated with forced convection, is performed in order to measure their thermal capacities.

Comparison of the heat performance of a typical aluminium heatsink, which was the best among the all aluminium heat sinks and proposed copper heatsink under identical experimental conditions, is performed.

Also in some numerical efforts, optimizing and predicting of the thermal characterization of the proposed heatsink with inclined free fins is developed. The model is scaled up in the fluent environment to predict its application in the cooling of larger heat generated electronic devices.

Impingement air-cooling mode of force-convection is adopted for heat dissipation from high power electronic devices in associated with the proposed inclined fin model.

Components of airflow velocity in the hollow spaces of the heatsink are discussed. Pressure drop and other thermal variables are analyzed analytical and by CFD code.

Another mechanical manufactured copper heat sink is investigated. A new design of the base and fins is optimized.

A three-dimensional finite volume method is developed to determine the performance of the proposed heatsink.

Thermal and hydraulic characterization of the heat sink under air-forced convection cooling condition is studied. The flow behavior around the fins and some other parts of the heat sink is analyzed by utilizing CFD code.

The hydraulic parameters including velocity profiles, distribution of static pressure, dynamic pressure, boundary layer and fluid temperature between the fins and in the passageway at the middle of the heat sink are analyzed and presented schematically.

Furthermore the thermal characteristic of the proposed heatsink is studied by contouring the three dimensional temperature distributions through the fins and temperature of the heat source by CFD code.

Place, publisher, year, edition, pages
Institutionen för samhällsteknik , 2007. , p. 120
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 72
Keywords [en]
copper heat sink cfd fluent modelling simulation
National Category
Energy Engineering
Research subject
Energi- och miljöteknik
Identifiers
URN: urn:nbn:se:mdh:diva-517ISBN: 978-91-85485-44-4 (print)OAI: oai:DiVA.org:mdh-517DiVA, id: diva2:121067
Presentation
2007-04-20, Gamma, Västerås, 09:00
Opponent
Supervisors
Available from: 2008-01-30 Created: 2008-01-30
List of papers
1. Numerical and experimental study of the inclined free fins applied for thermal management
Open this publication in new window or tab >>Numerical and experimental study of the inclined free fins applied for thermal management
(English)In: International journal of numerical methods for heat & fluid flow, ISSN 0961-5539, E-ISSN 1758-6585Article in journal (Refereed) Submitted
National Category
Engineering and Technology
Identifiers
urn:nbn:se:mdh:diva-4166 (URN)
Available from: 2008-01-30 Created: 2008-01-30 Last updated: 2017-12-14Bibliographically approved
2. 3-Dimensional numerical and analytical study of flow and thermal behavior of proposed mechanical fabrication copper heat sink
Open this publication in new window or tab >>3-Dimensional numerical and analytical study of flow and thermal behavior of proposed mechanical fabrication copper heat sink
(English)In: Journal of green energyArticle in journal (Refereed) Submitted
National Category
Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-4167 (URN)
Available from: 2008-01-30 Created: 2008-01-30 Last updated: 2014-10-07Bibliographically approved
3. Experimental determination of the thermal performance of a free standing fin
Open this publication in new window or tab >>Experimental determination of the thermal performance of a free standing fin
2008 (English)In: The 49th Scandinavian Conference on Simulation and Modeling (SIMS 2008), 2008Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:mdh:diva-4168 (URN)82-579-4632-X (ISBN)978-82-579-4632-6 (ISBN)
Conference
SIMS 2008, Oslo University college Oct 7-8, 2008-10-08
Available from: 2008-01-30 Created: 2008-01-30 Last updated: 2013-02-06Bibliographically approved
4. Some important considerations in heatsink design
Open this publication in new window or tab >>Some important considerations in heatsink design
2004 (English)In: Proceedings of the 6th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Micro-Electronics and Micro-Systems - EuroSimE 2005, 2004, p. 406-413Conference paper, Published paper (Refereed)
Abstract [en]

This work is the study of heatsinks in theoretical and technical aspects. The objective of this paper is to provide a more clear imagine of heatsinks function and technology for beginners, designers, and researcher in various features. This paper serves as a guide for them to compare novel heatsink technologies. Theoretical correlations and simple equations recommended to calculate the heat transfer rate include Nusselt number, heat transfer coefficient and associated variables for some types of heatsinks to a certain extent are involved. Common terms and phenomenon in the heatsinks are defined.

National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-4169 (URN)10.1109/ESIME.2005.1502838 (DOI)2-s2.0-33745712136 (Scopus ID)9780780390621 (ISBN)
Conference
6th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Micro-Electronics and Micro-Systems - EuroSimE 2005; Berlin; Germany; 18 April 2005 through 20 April 2005
Available from: 2008-01-30 Created: 2008-01-30 Last updated: 2015-07-08Bibliographically approved

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