Grumman Aerospace Corporation

The United States of America As Represented by the Administrator of the

Northrop Grumman Systems Corporation

United States of America As Represented by the Administrator of Nasa

Fred Edelstein

Robert L Kosson

Richard F Brown

Robert A Haslett

William Harwell

Maria Liandris

John M Papazian

Edward V Sullivan

Joseph P Alario

Odd E Sangesland

Vincent Cirrito

Bruno Lijoi

Bruce Cordes

Louis G Casagrande

A controlled low temperature chamber for a microscope has a vacuum chamber in a housing. The housing has a top panel and a bottom panel. A mounting in the chamber mounts a sample in a manner whereby the sample is microscopically observable. The mounting includes a base member, a pair of spaced supports extending perpendicularly from the base member and a pair of spaced platforms supported by the supports. Each of the platforms has an upper surface on which the sample rests and a spaced undersurface beneath the sample. A temperature control system maintains a specified temperature in the chamber, applies a controlled temperature gradient on the sample and moves the gradient along the sample in a controlled manner, thereby directionally solidifying and melting the sample, as desired.

Cryogenic temperature gradient microscopy chamber

A monogroove heat pipe has a single central manifold communicating with plural parallel connected evaporators and a single condenser. The invention is directed to a tubular screen device which is axially positioned within the liquid channel of the manifold. A number of longitudinally spaced holes are formed in the body of the screen device, each hole being defined by cusp edges which are turned outwardly from the screen body into joint ends of the condenser and evaporator liquid channels. The existence of the screen material at the joint between condenser, evaporators, and the manifold assists the establishment of a primed condition in the heat pipe, even in a zero 'g' environment for any initial liquid distribution within the heat pipe.

Heat pipe manifold with screen-lined insert

An improved capillary pumped loop evaporator includes circumferential grooves formed in the outer heat exchanger portion of the evaporator. The grooves open to the interface existing between the heat exchanger and a centrally positioned tubular wick. Axially extending vapor channels are formed in the wick and also open onto the interface. The circumferential grooves continuously communicate with the interface and provide a vapor escape to the vapor channels which direct vapor passage from the evaporator. By shortening the vapor path from the interface, a thinner vapor barrier is possible at the interface which results in more efficient heat transfer.

Capillary pump evaporator

A re-entrant groove heat pipe provides capillary channel fin surfaces which are smooth, continuous, and offer a large radius of curvature upon which an extended thin film of working liquid may develop. Superior formation of thin films of the working fluid allows heat to be conducted more readily between the surface of the heat pipe and the surface of the fluid where evaporation and condensation takes place.

Large capacity re-entrant groove heat pipe

An interrupted monogroove slot in a heat pipe facilitates priming of the heat pipe under zero gravity conditions by preventing the monogroove slot from completely priming before the liquid channel is primed.

Interrupted monogroove slot

An in-line, non-condensible gas trap for a liquid line which includes an interior mesh tube through which fluid can flow to a trap outlet. Non-condensible gas is trapped outwardly of the mesh tube due to capillary action and periodically the collected gas is vented thereby ridding the liquid line of the non-condensible gas. The present trap operates well in outer space environments (zero gravity) as well as normal ambient conditions (1 g).

Liquid line non-condensible gas trap

A liquid supply control is disclosed for a heat transfer system which transports heat by liquid-vapor phase change of a working fluid. An assembly (10) of monogroove heat pipe legs (15) can be operated automatically as either heat acquisition devices or heat discharge sources. The liquid channels (27) of the heat pipe legs (15) are connected to a reservoir (35) which is filled and drained by respective filling and draining valves (30, 32). Information from liquid level sensors (50, 51) on the reservoir (35) is combined (60) with temperature information (55) from the liquid heat exchanger (12) and temperature information (56) from the assembly vapor conduit (42) to regulate filling and draining of the reservoir (35), so that the reservoir (35) in turn serves the liquid supply/drain needs of the heat pipe legs (15), on demand, by passive capillary action (20, 28).

Monogroove liquid heat exchanger

A pumped loop two-phase heat transfer system, operating at a nearly constant temperature throughout, includes a plurality of independently operating grooved capillary heat exchanger plates supplied with working fluid through independent flow modulation valves connected to a liquid supply line, a vapor line for collecting vapor from the heat exchangers, a condenser between the vapor and the liquid lines, and a fluid circulating pump between the condenser and the heat exchangers.

Pumped two-phase heat transfer loop

The coolant fluid evaporated in a compact heat absorbing panel (12) utilizing monogroove heat pipes in a pumped two-phase system is replenished through a liquid inlet control valve (35) under the control of an ultrasonic liquid presence detector (40) which is connected to the panel (10). The detector (40) maintains the desired liquid quantity in the panel's liquid coolant channels (25), thereby dynamically responding to varying heat loads.

Monogroove cold plate

A thermal management system using heat pipe principles and incorporating capillary-pumped equipment mounting panels such that a heat transport loop without moving parts is provided. The panels can function to either absorb heat or to reject heat and can interface with heat generating equipment or heat radiators. Each panel comprises a pair of coextensive flat plates bonded together with a thin, fine-pore sheet wick interposed therebetween. A network of liquid grooves in one plate is in fluid communication with the sheet wick which covers the grooves and most of the plate and a separate liquid line connecting the panels. A network of vapor channels in the other plate is in fluid communication with the wick and with a separate vapor line connecting the panels. The vapor channel networks of the panels and the liquid groove networks of the panels are connected such that the panels are arranged in parallel in the fluid circuit or loop. A heat input into panels in the loop causes evaporation of liquid off the surface of the sheet wick. Vapor from the evaporated liquid is circulated to panels serving as cold sinks where the vapor is condensed. Capillary action of the wicks returns the condensate to the panels being heated where the cycle is repeated.

Capillary-pumped heat transfer panel and system

A circuit card having the capability for the high-density packaging of electronic components thereon for use in high power-density card racks in computer and other electronic and avionic systems. The card has an all metal construction with an elongated planar body portion for the mounting of electronic components on the opposite sides thereof and has a heat pipe located along the edges of one elongated side and the two ends. A connector for making the required electrical connections to the electronic components is provided along the edge of the second elongated side. Edge tabs on the ends of the card permit the card to be installed into a card rack in electronic equipment. The elongated portion of the heat pipe serves as the evaporator region thereof and the two end portions act as the condensing regions. In operation, heat from the components on the card is conducted into the evaporator region of the heat pipe and is transferred to the condensing region thereof where it passes by conduction into the cooling system of the card rack.

Heat-pipe cooled electronic circuit card

A heat pipe to remove heat from a light fixture in a room of a building that will transfer the fixture heat to a system in a building that will in turn reject or use the fixture heat in a heating, ventilating, air conditioning system for the building.

Growing community of inventors

Hauppauge, NY, United States of America

Fred Edelstein