Heat Pipe with Nanostructured Wick

a nano-structured, heat pipe technology, applied in indirect heat exchangers, semiconductor/solid-state device details, lighting and heating apparatus, etc., can solve the problems of increasing fluid flow, significantly reducing the thermal resistance of the nano-bristle structure, etc., to achieve no operating cost, high efficiency, and more efficient

Inactive Publication Date: 2010-08-12
ILLUMINEX CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0003]Heat pipes are the method of choice for electronic systems thermal management because of the performance advantages they have over conventional aluminum extrusion heat sinks and other solid state cooling technologies. A heat pipe cooler uses the high efficiency evaporation and condensation cycles of a working fluid to transfer heat as shown in FIG. 1. Compared to other cooling techniques, such as for...

Problems solved by technology

Thus the nanobristle architecture can significantly decrease the thermal resistance and increas...

Method used

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  • Heat Pipe with Nanostructured Wick
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  • Heat Pipe with Nanostructured Wick

Examples

Experimental program
Comparison scheme
Effect test

case # 1

Case #1: if C=20 nm, D=10 nm, L=1 μm, BSR=125.6

Case #2: If C=250 nm, D=200 nm, L=100 μm, BSR=1962.5

case # 3

Case #3: If C=100 nm, D=60 nm, L=200 μm, BSR=3600

[0059]In this case, BSR is calculated based on only the outer cylindrical area of the nanowires.

For case #2, on a 1 cm piece of material, the nanowire tips occupy about 0.50 cm2, justifying their exclusion from the calculation.

[0060]By lengthening the nanowires and placing them on narrower spacing one can get the BSR up to approximately 3,600, that is, Case #3. Typical sintered metal powder wicks exhibit a BSR of about 35. The wicking material disclosed in U.S. Pat. No. 4,015,659 discloses a material with a BSR estimated to be approximately 5 to approximately 50, depending on a range of whisker length of 100 microns to 1 millimeter. Practitioners of ordinary skill will recognize that if the length of the nanowire is too long relative to its diameter, then it is more likely to crack or otherwise fail. In the preferred embodiment, the aspect ratio of the nanowires should be less than approximately 2500 to 1. The aspect ratio is defined ...

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Abstract

A heat pipe with a nanostructured wick is disclosed, with the method of forming the nanostructured wick on a metal substrate. The wicking material is a pattern of metallic nanostructures in the form of bristles or nanowires attached to a substrate, where the bristles are substantially freestanding.

Description

[0001]This application claims priority to U.S. Pat. App. No. 66 / 778,873, filed on Mar. 3, 2006, which is hereby incorporated herein by reference for all that it teaches and to U.S. Pat. App. No. 60 / 888,391, filed on Feb. 6, 2007, which is hereby incorporated herein by reference for all that it teaches.[0002]This invention was supported in part by U.S. Government contract number Phase I SBIR Navy Contract N65540-03-0055 and NSF Phase 165618840 and portions of this invention may be subject to a paid-up license to the U.S. Government.BACKGROUND AND SUMMARY OF THE INVENTION[0003]Heat pipes are the method of choice for electronic systems thermal management because of the performance advantages they have over conventional aluminum extrusion heat sinks and other solid state cooling technologies. A heat pipe cooler uses the high efficiency evaporation and condensation cycles of a working fluid to transfer heat as shown in FIG. 1. Compared to other cooling techniques, such as forced single a...

Claims

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Application Information

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IPC IPC(8): F28D15/04B21D53/02
CPCB82Y30/00C25D7/00C25D11/02F28D15/046Y10T29/49353H01L23/427H01L2924/0002F28F13/185H01L2924/00
Inventor HABIB, YOUSSEF M.RICKARD, LYMAN H.JOHN, BRYAN G.STEINBECK, JOHN W.
Owner ILLUMINEX CORP
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