The Resource Wettability and nanostructure effect on oscillating heat pipes, by Feng Z. Zhang

Wettability and nanostructure effect on oscillating heat pipes, by Feng Z. Zhang

Label
Wettability and nanostructure effect on oscillating heat pipes
Title
Wettability and nanostructure effect on oscillating heat pipes
Statement of responsibility
by Feng Z. Zhang
Creator
Contributor
Author
Thesis advisor
Subject
Genre
Language
eng
Summary
As electronics technologies rapidly develop with a demand for more power and miniaturization, effective thermal management of these systems becomes much more important. The oscillating heat pipe (OHP) is a promising highly efficient heat transfer device that is great for high heat flux applications common in the electronics industry. In the current investigation, the wettability effect on the heat transfer performance of OHPs has been conducted: 1) Extensive experimental investigation of the inner surface wettability on the heat transfer performance of an OHP has been conducted. The inner surface of OHP evaporator was first treated to determine whether the hydrophilic surface treatment can enhance the heat transfer performance. Then, an experimental investigation of hybrid half hydrophilic/half hydrophobic OHP was conducted to determine their effects on the oscillating amplitude, frequency and heat transfer performance. The overall performance of configuration of hydrophilic evaporator/ hydrophobic condenser and hydrophobic evaporator/ hydrophilic condenser was worse than the nontreated OHP, however; the oscillations were much damper when comparing the amplitudes. 2) In order to visualize the wettability effect on the oscillating motion and frequency, neutron image technology has been utilized to study the hydrophilic surface effect on the oscillating motion. An OHP with dimensions of 88 mm x 40 mm was fabricated and tested. Results show that high oscillating motion occurs in the OHP with the hydrophilic surface while low oscillating motion occurs in the untreated OHP. 3) In order to find the mechanism how the wettability affects the oscillating motion and amplitude, a mathematical model was developed. The model considers the effects of frictional force, driving force, and receding and advancing contact angles. Results show that as contact angle increases the oscillating motion decreases. 4) In addition, based on the Taylor bubble flow, a theoretical model predicting the operating limitation is developed. The model considers the effects of radius of the channel, charging ratio, length of the OHP, and multiple working fluids Results show that radius and charging ratio has a large effect on the maximum heat transfer limit while length has a relatively small contribution. When comparing working fluids such as water, acetone, and R123, water has a significantly higher upper heat transfer limit than acetone and R123
Cataloging source
MUU
http://library.link/vocab/creatorDate
1989-
http://library.link/vocab/creatorName
Zhang, Feng Z.
Degree
PhD
Dissertation note
Thesis
Dissertation year
2015.
Government publication
government publication of a state province territory dependency etc
Granting institution
University of Missouri--Columbia
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorDate
1962-
http://library.link/vocab/relatedWorkOrContributorName
Ma, Hongbin
http://library.link/vocab/subjectName
  • Heat pipes
  • Heat pipes
  • Heat
  • Fluid mechanics
  • Oscillations
Label
Wettability and nanostructure effect on oscillating heat pipes, by Feng Z. Zhang
Instantiates
Publication
Note
  • "A Dissertation presented to the Faculty of the Graduate School at the University of Missouri-Columbia In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation supervisor: Dr. Hongbin Ma
  • Includes vita
Bibliography note
Includes bibliographical references (pages 113-118)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
957979891
Extent
1 online resource (xi, 119 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)957979891
Label
Wettability and nanostructure effect on oscillating heat pipes, by Feng Z. Zhang
Publication
Note
  • "A Dissertation presented to the Faculty of the Graduate School at the University of Missouri-Columbia In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation supervisor: Dr. Hongbin Ma
  • Includes vita
Bibliography note
Includes bibliographical references (pages 113-118)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
957979891
Extent
1 online resource (xi, 119 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)957979891

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