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Method for a heat pipe using a wick with variable properties

IP.com Disclosure Number: IPCOM000032546D
Publication Date: 2004-Nov-08
Document File: 2 page(s) / 35K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a heat pipe (vapor chamber) using a wick with variable properties. Benefits include improved functionality, improved performance, and improved design flexibility.

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Method for a heat pipe using a wick with variable properties

Disclosed is a method for a heat pipe (vapor chamber) using a wick with variable properties.  Benefits include improved functionality, improved performance, and improved design flexibility.

Background

              Several different materials have been used conventionally in wicks. The material selection is important to heat pipe performance.

              The wicking material in the heat pipe serves several functions. It provides an evaporation site for the liquid in the component. The vapor transits to the condenser section through the adiabatic section. If the wicking material does not insulate the vapor from a cooler temperature inside the chassis, condensation may occur in a location that is undesirable for the overall thermal performance. The wick serves to insulate the vapor from the chassis temperature. The wick assists by providing a site for condensation. Additionally, the wick delivers the condensed liquid back to the evaporator section.

              For copper heat pipes, restrictions in bend radius and flattening thickness limits the flexibility of the thermal solution design.

Description

              The disclosed method is a heat pipe (vapor chamber) using a wick with variable properties. The method enhances the wick’s functions by modifying the material and/or its properties in each section to best perform the different and somewhat noncomplimentary tasks (see Figure 1).

              The disclosed method can be achieved in one or more of the following ways:
•             Wick with a metal evaporator and condenser section and a plastic adiabatic section.
•             Plastic wicking section to provide insulation from the chassis in the adiabatic section.
•             Alternate materials (plastic or ceramic) made with a finer pore structure to facilitate pumping power in the adiabatic section. The surface of the alternative materials could...