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Method for reverse/back-flow prevention on a looped heat pipe

IP.com Disclosure Number: IPCOM000008060D
Publication Date: 2002-May-15
Document File: 4 page(s) / 68K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for reverse/back-flow prevention on a looped heat pipe. Benefits include improved thermal performance.

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Method for reverse/back-flow prevention on a looped heat pipe

Disclosed is a method for reverse/back-flow prevention on a looped heat pipe. Benefits include improved thermal performance.

Background

               Conventional designs do not have a method of preventing reverse flow of vapor and/or liquid in looped heat pipes (see Figure 1). As a result, cooling efficiency is reduced or fails. To address this problem, various wick materials are placed at the liquid return line to lead the liquid to flow back to the evaporator. However, the designs do not prevent the reverse flow of vapor or back-pressure oscillation, which could cause functional failure or reduction of efficiency resulting in a higher thermal resistance.

General description

      The disclosed method is a device that causes the vapor to flow in one direction only in the loop heat pipe. The design prevents the reverse flow of vapor back into the liquid-return line from the condenser. Reverse flow could cause loop heat pipe failure, evaporator dry out, and wick failure due to oscillation. These effects could result in higher thermal resistance.

      A flow control device such as a baffle or check ball is specially constructed to regulate the flow at the liquid return line inlet to the evaporator, preventing vapor from flowing backward into the liquid return line, and causing controlled flow of vapor/liquid in one direction only.

Advantages

      Technical disclosed method provides advantages, including:

§         Elimination of functional failure of the loop heat pipe due to the reverse flow of vapor

§         Establishment of a predictable circulation of flow for vapor and liquid phases

§         Avoidance of vapo...