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Method for a heat pipe with a flexible, partially filled, corrugated section

IP.com Disclosure Number: IPCOM000012016D
Publication Date: 2003-Apr-02
Document File: 3 page(s) / 104K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a heat pipe with a flexible, partially filled, corrugated section. Benefits include improved thermal performance, improved design flexibility.

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Method for a heat pipe with a flexible, partially filled, corrugated section

Disclosed is a method for a heat pipe with a flexible, partially filled, corrugated section. Benefits include improved thermal performance, improved design flexibility.

Background

        � � � � � Conventional round heat pipes are hard metal tubing that is not flexible (see Figure 1).�

        � � � � � In a flexible heat pipe, liquid accumulates in the corrugated, flexible section. Liquid can be condensed and trapped in each corrugated bend or space, resulting either in performance reduction or in failure/malfunction due to dry out at the evaporator.

        � � � � � If a wick is not well attached to the internal wall of a corrugated section, the heat pipe may not work at all orientations.

        � � � � � Gravity assisted thermosiphons have been fabricated using corrugated tubing. However, heat pipes with a flexible section (operating against gravity) have not been fabricated due to the difficulty of wick attachment and manufacturing.

General description

� � � � � The disclosed method is a heat pipe with a flexible adiabatic section made of partially filled corrugated tubing. Filling prevents liquid accumulation and enables good wick attachment to the internal wall. The flexible section enables more design flexibility and extends air-cooling technologies. The corrugated section can be manufactured with solder copper tubing ends.

        � � � � � The corrugated spaces are partially filled with materials that prevent liquid accumulation or holdup, which could result in performance reduction or heat pipe failure. The flexible corrugated section provides flexibility, enabling small bending and 3-D movement to take place. The disclosed method shows the possibility of fabricating of a flexible heat pipe that works at any orientation.

        � � � � � The filled material is injection molded into the corrugated section after an adhesive coating is applied to the inside surface of the corrugated wall to bond the filled material to the wall. A hole that is the same inside diameter of the copper tubing is drilled through the filled material. A heat pipe manufacturer installs the wire fiber bundle wick structure inside the tubing and forms the heat pipe, using the standard process. The formed heat pipe can be bent to any...