Browse Prior Art Database

Chemical Heat Pipe

IP.com Disclosure Number: IPCOM000074667D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Aakalu, NG: AUTHOR [+3]

Abstract

A heat pipe is an enclosed pipe-like structure which is capable of transferring heat applied at one end thereof to the other end. The heat is transferred in a vapor phase following evaporation at the heat input end, and is condensed at the heat output end and returned to the heat input end in a liquid phase by capillary action. The heat pipe 10, shown in the drawing, depends on the heat of reaction of a chemical such as (N(2)O(4)) nitrogen tetroxide. In the reaction zone I, heat is added to the pipe 10 which causes the liquid chemical 12 to disassociate so that the liquid phase is transformed to a gaseous mixture 14. The product of the gaseous reaction moves to the reaction zone II, where heat is removed from the pipe.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Chemical Heat Pipe

A heat pipe is an enclosed pipe-like structure which is capable of transferring heat applied at one end thereof to the other end. The heat is transferred in a vapor phase following evaporation at the heat input end, and is condensed at the heat output end and returned to the heat input end in a liquid phase by capillary action.

The heat pipe 10, shown in the drawing, depends on the heat of reaction of a chemical such as (N(2)O(4)) nitrogen tetroxide. In the reaction zone I, heat is added to the pipe 10 which causes the liquid chemical 12 to disassociate so that the liquid phase is transformed to a gaseous mixture 14. The product of the gaseous reaction moves to the reaction zone II, where heat is removed from the pipe. At reaction zone II, a reverse reaction takes place which results in the gaseous phase returning to the liquid phase. The heat of reaction, plus the heat of evaporation, is removed from the pipe and the liquid 12 is transported back to zone I by the capillary action of a wick material 16.

The heat pipe 10 works under essentially isothermal conditions and the pressure inside the device is maintained essentially uniform. Large amounts of heat for a given size of wick material 16 can be transferred by choosing the proper chemical reactions. Also, the rate and location of the reaction can be controlled by selectively coating the wick material 16 with a catalyst 18.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text obje...