Browse Prior Art Database

Airflow Turning Vane

IP.com Disclosure Number: IPCOM000102225D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Holahan, MF: AUTHOR [+2]

Abstract

Disclosed is an aerodynamic turning vane which equalizes velocity distribution and lowers pressure drop downstream of a 90-degree turn in cooling paths across electronic component packages.

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This is the abbreviated version, containing approximately 90% of the total text.

Airflow Turning Vane

       Disclosed is an aerodynamic turning vane which equalizes
velocity distribution and lowers pressure drop downstream of a
90-degree turn in cooling paths across electronic component packages.

      Aerodynamic turning vanes are commonly used in heating and
ventilation ducts to reduce impedance losses due to turning the air
through sharp bends.  Sharp bends in a flow path cause flow
separation, forming a stagnant region downstream of the turn.  A
single curved turning vane blade is positioned in a bend to eliminate
flow stagnation at the inner turn.  The vane provides a balanced flow
through electronics to allow greater layout flexibility for power
density across a card.  The vane attaches to card cage with two
screws.

      A thin curved metal blade positioned at the inlet duct splits
the airflow and turns it sharply to prevent formation of an eddy
zone.

      Refer to the side view shown in Fig. 1.  Air enters a duct at
3 and must turn sharply down to reach card components in area 5.
Normally this causes uneven flow distribution shown by arrows near 5.
The vane blade 1 extends across the duct inlet to divert airflow 3
into stagnation area 5.  A curved cam-lever catch bar 6 is used in
conjunction with the turning vane 1 to lower the effective
inside-turn radius.  Resulting improved flow velocity distribution is
shown by 7.

      Fig. 2 illustrates how the vane 1 attaches to cage sidewall 12
using a tab 8 in hole 9 an...