Browse Prior Art Database

Boiling Initiation Device for Thermosyphons

IP.com Disclosure Number: IPCOM000113940D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Agonafer, D: AUTHOR [+4]

Abstract

A method for promoting the consistent and predictable onset of boiling at the lowest possible superheat is disclosed. The dependence of the saturation temperature of a liquid upon the system pressure is exploited to temporally elevate the superheat without elevating the liquid temperature.

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This is the abbreviated version, containing approximately 92% of the total text.

Boiling Initiation Device for Thermosyphons

      A method for promoting the consistent and predictable onset of
boiling at the lowest possible superheat is disclosed.  The
dependence of the saturation temperature of a liquid upon the system
pressure is exploited to temporally elevate the superheat without
elevating the liquid temperature.

      The concept behind the Boiling Initation Device (BID) is to
generate a low level pressure oscillation in the coolant field (100)
near the boiling surface.  The idea is that as the pressure is
temporarily depressed, the corresponding drop in the saturation
temperature will cause a temporary elevation in the effective surface
superheat resulting in the growth and release of a vapor embryo
(bubble).  An existing thermosyphon evaporator (101) having a
saturated liquid inlet (102) and a two-phase outlet (103) could be
modified to incorporate the BID by the addition of a pulse port
(104).  The BID seeks to provide the necessary pressure variation by
small movements of a flexible membrane (105) in contact with a
plunger (106).  The plunger is driven by the coupling of permanent
magnets (107) embedded in the plunger stem with an annular
electromagnet (108) fixed in the BID housing (109).  The membrane is
a thin elastomer disc with a thickened rim to serve as a seal and is
held in place by the BID housing.  The BID housing is capped by a
"black box" pulse generator (110) that drives the electromagnet using
power taken from th...