Axially Tapered And Bilayer Microchannels For Evaporative Cooling Devices
Abstract
The invention consists of an evaporative cooling device comprising one or more microchannels whose cross section is axially reduced to control the maximum capillary pressure differential between liquid and vapor phases. In one embodiment, the evaporation channels have a rectangular cross section that is reduced in width along a flow path. In another embodiment, channels of fixed width are patterned with an array of microfabricated post-like features such that the feature size and spacing are gradually reduced along the flow path. Other embodiments incorporate bilayer channels consisting of an upper cover plate having a pattern of slots or holes of axially decreasing size and a lower fluid flow layer having channel widths substantially greater than the characteristic microscale dimensions of the patterned cover plate. The small dimensions of the cover plate holes afford large capillary pressure differentials while the larger dimensions of the lower region reduce viscous flow resistance.
- Inventors:
-
- Cardiff, CA
- Livermore, CA
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 880227
- Patent Number(s):
- 6951243
- Application Number:
- 10/683938
- Assignee:
- Sandia National Laboratories (Livermore, CA)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F28 - HEAT EXCHANGE IN GENERAL F28D - HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
F - MECHANICAL ENGINEERING F28 - HEAT EXCHANGE IN GENERAL F28F - DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- DOE Contract Number:
- AC04-94AL85000
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Nilson, Robert, and Griffiths, Stewart. Axially Tapered And Bilayer Microchannels For Evaporative Cooling Devices. United States: N. p., 2005.
Web.
Nilson, Robert, & Griffiths, Stewart. Axially Tapered And Bilayer Microchannels For Evaporative Cooling Devices. United States.
Nilson, Robert, and Griffiths, Stewart. Tue .
"Axially Tapered And Bilayer Microchannels For Evaporative Cooling Devices". United States. https://www.osti.gov/servlets/purl/880227.
@article{osti_880227,
title = {Axially Tapered And Bilayer Microchannels For Evaporative Cooling Devices},
author = {Nilson, Robert and Griffiths, Stewart},
abstractNote = {The invention consists of an evaporative cooling device comprising one or more microchannels whose cross section is axially reduced to control the maximum capillary pressure differential between liquid and vapor phases. In one embodiment, the evaporation channels have a rectangular cross section that is reduced in width along a flow path. In another embodiment, channels of fixed width are patterned with an array of microfabricated post-like features such that the feature size and spacing are gradually reduced along the flow path. Other embodiments incorporate bilayer channels consisting of an upper cover plate having a pattern of slots or holes of axially decreasing size and a lower fluid flow layer having channel widths substantially greater than the characteristic microscale dimensions of the patterned cover plate. The small dimensions of the cover plate holes afford large capillary pressure differentials while the larger dimensions of the lower region reduce viscous flow resistance.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 04 00:00:00 EDT 2005},
month = {Tue Oct 04 00:00:00 EDT 2005}
}
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