Girardeau Henderson Phones & Addresses
-
3507 Willow Ridge Rd, Lynn Haven, FL 32444 (850) 265-5404
-
1319 Capri Dr, Panama City, FL 32405 (850) 265-5404
-
Tucson, AZ
Publications
Us Patents
Liquid-Crystal Heat Valve Controlled With Multiple Electrode Pairs
View pageUS Patent:
51881713, Feb 23, 1993
Filed:
Jun 22, 1992
Appl. No.:
7/902201
Inventors:
Michael E. Stefanov - Lynn Haven FL
Rand R. Biggers - Fairborn OH
Jeff W. Rish - Lynn Haven FL
Girardeau L. Henderson - Panama City FL
Chuong N. Pham - Panama City FL
Rand R. Biggers - Fairborn OH
Jeff W. Rish - Lynn Haven FL
Girardeau L. Henderson - Panama City FL
Chuong N. Pham - Panama City FL
Assignee:
The United States of America as represented by the Secretary of the Navy - Washington DC
International Classification:
F28F 1300
US Classification:
165 96
Abstract:
A liquid-crystal heat valve is constructed to be controlled with multiple ectrode pairs. So constructed, it is controllable by alternating electric potentials in different phases applied to corresponding electrode pairs, thus increasing the maximum heat-transfer rate of the heat valve by increasing its duty cycle.
Electrically Controlled Liquid-Crystal Heat Valve
View pageUS Patent:
52225488, Jun 29, 1993
Filed:
May 26, 1992
Appl. No.:
7/888096
Inventors:
Rand R. Biggers - Fairborn OH
Jeff W. Rish - Lynn Haven FL
Girardeau L. Henderson - Panama City FL
Chuong N. Pham - Panama City Beach FL
Robert R. Fuller - Champaign IL
Jeff W. Rish - Lynn Haven FL
Girardeau L. Henderson - Panama City FL
Chuong N. Pham - Panama City Beach FL
Robert R. Fuller - Champaign IL
Assignee:
The United States of America as represented by the Secretary of the Navy - Washington DC
International Classification:
F28F 1300
US Classification:
165 46
Abstract:
An improved electrically controlled thermotropic liquid-crystal heat valve to control the flow of heat between two bodies of different temperatures by interposing therebetween a fluid layer of liquid-crystal material having a nematic temperature range that includes the temperature of both bodies. This type of heat valve has particular application to any free-swimming divers' diving garments, to provide some thermal protection against the cold ambient water. The heat valve uses stable liquid-crystal materials encapsulated in a sealed environment, with the valves' electrodes being shielded and not in direct electrical contact with the liquid-crystal material. This arrangement essentially completely eliminates the electrochemical effects which can otherwise degrade the liquid-crystal materials, so that the liquid crystal may function for a very long time. The valve is electrically controlled between the respective two different modes of its open and closed conditions, the open mode occurring when a low frequency AC field is applied to one of the liquid crystal materials; and the closed mode occurring when a high frequency field is applied to effect reorientation of the molecules of the liquid crystal materials in a direction perpendicular to the applied AC field, precluding establishment of convective flow cells, thereby retarding the transfer of heat.