Browse Prior Art Database

Air-Cooled Circuit Module With Rotating Turbulator Retained in Snap-On Cover

IP.com Disclosure Number: IPCOM000034898D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hwang, UP: AUTHOR [+2]

Abstract

In a system in which cooling air flows across the surface of a circuit card that carries heat-producing circuit modules, a rotating turbulator is located on the top of each module. The turbulator is propeller- shaped and rotates passively in the stream of cooling air. The lower edge of the propeller is spaced close to the upper surface of the module cap, and the rotation breaks up the boundary layer that otherwise forms a high impedance in the path of heat transfer from the top of the module to the air stream. The rotating turbulator produces less pressure drop than stationary turbulators and thereby provides enhanced air cooling. In one implementation, the turbulator is formed as part of a snap-on cover for the module. The cover is made of a flexible material such as plastic. It is open at its upstream and downstream ends.

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Air-Cooled Circuit Module With Rotating Turbulator Retained in Snap-On Cover

In a system in which cooling air flows across the surface of a circuit card that carries heat-producing circuit modules, a rotating turbulator is located on the top of each module. The turbulator is propeller- shaped and rotates passively in the stream of cooling air. The lower edge of the propeller is spaced close to the upper surface of the module cap, and the rotation breaks up the boundary layer that otherwise forms a high impedance in the path of heat transfer from the top of the module to the air stream. The rotating turbulator produces less pressure drop than stationary turbulators and thereby provides enhanced air cooling. In one implementation, the turbulator is formed as part of a snap-on cover for the module. The cover is made of a flexible material such as plastic. It is open at its upstream and downstream ends. The cover has its sides adapted to flexibly grip the edges of a module cap. The top of the snap-on cover supports the turbulator in the space above the top of the module and the propeller rotates as air flows in the space between the top of the module and the top of the cover. In an alternative embodiment, the propeller is attached to the top of the module cap.

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