Spatially distributed ventilation boundary using electrohydrodynamic fluid accelerators
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a fluid accelerator and electrohydrodynamic technology, applied in the field of thermal management, can solve the problems of impracticality of conventional fan or blower ventilation, and achieve the effects of facilitating compelling product design, reducing volume and mass, and being thinner and lighter
Inactive Publication Date: 2010-05-13
TESSERA INC
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[0009]EHD devices may be employed to motivate flow of air in a thermal management system, such as employed to exhaust heat dissipated by integrated circuits in computing devices and electronics. For example, in devices such as laptop computers, compact scale, flexible form factor and absence of moving parts can provide design and user advantages over conventional forced air cooling technologies that rely exclusively on fans or blowers. EHD device solutions can operate silently (or at least comparatively so) with reduced volume and mass. In some cases, products incorporating EHD device solutions may be thinner and lighter than those employing conventional forced air cooling technologies. Flexible form factors of EHD devices can facilitate compelling product designs and, in some cases, may provide functional benefits.
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In some cases, spatial distributions of the ventilation boundary facilitate or enable enclosure geometries for which conventional fan or blower ventilation would be impractical.
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[0043]Thermal management systems described herein employ EHD devices to motivate flow of air between ventilated boundary portions of an enclosure. In this way, heat dissipated by electronics (e.g., microprocessors, graphics units, etc.) and other components may be transferred to the air flow and exhausted. Typically, the thermal management system includes heat transfer paths (often implemented as heat pipes or using other technologies) to transfer heat from where it is dissipated (or generated) to a location (or locations) within the enclosure where air flow motivated by an EHD device (or devices) flows over heat transfer surfaces.
[0044]As described herein relative to certain illustrative embodiments, some heat transfer surfaces may act as collector electrodes and participate in EHD acceleration of fluid flow (typically air flow), while additional heat transfer surfaces are provided that do not substantially contribute to motivation of fluid flow. Those heat transfer surfaces that a...
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Abstract
In thermal management systems that employ EHD devices to motivate flow of air through an enclosure, spatial distribution of a ventilation boundary may facilitate reductions in flow resistance by reducing average transit distance for cooling air from an inlet portion of the ventilation boundary to an outlet portion. Some thermal management systems described herein distribute a ventilation boundary over opposing surfaces, adjacent surfaces or even a single surface of an enclosure while providing a short, “U” shaped, “L” shaped or generally straight through flow path. In some cases, spatial distributions of the ventilation boundary facilitate or enable enclosure geometries for which conventional fan or blower ventilation would be impractical. In some cases, provision of multiple portions of the ventilation boundary may allow the thermal management system to tolerate blockage or occlusion of a subset of the inlet and/or outlet portions and, when at least some of such portions are non-contiguous spatially-distributed, tolerance to a single cause of blockage or occlusion is enhanced.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]The present application claims the benefit of U.S. Provisional Application No. 61 / 113,225, filed Nov. 10, 2008. The present application is also related to commonly-owned, co-pending U.S. patent application Ser. No. ______, entitled “ELECTROHYDRODYNAMIC FLUID ACCELERATOR WITH HEAT TRANSFER SURFACES OPERABLE AS COLLECTOR ELECTRODE,” naming Jewell-Larsen, Honer, Schwiebert, Ran, Savalia and Zhang as inventors, and to commonly-owned, co-pending U.S. patent application Ser. No. ______, entitled “REVERSIBLE FLOW ELECTROHYDRODYNAMIC FLUID ACCELERATOR,” naming Jewell-Larsen, Honer, Schwiebert, Ran, Savalia and Zhang as inventors, each filed on even date herewith.BACKGROUND[0002]1. Field[0003]The present application relates to thermal management, and more particularly, to micro-scale cooling devices that use electrohydrodynamic (EHD, also known as electro-fluid-dynamic, EFD) technology to generate ions and electrical fields to control the moveme...
Claims
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Patent Type & Authority Applications(United States)
IPC IPC(8): F24H9/02H02K44/02F28D15/00
CPCF04B19/006G06F1/203H02N11/006F28F2250/08
Inventor JEWELL-LARSEN, NELSHONER, KENNETH A.SCHWIEBERT, MATTRAN, HONGYUSAVALIA, PIYUSHZHANG, YAN