US20110030928A1 - Cooling Device and Method - Google Patents
Cooling Device and Method Download PDFInfo
- Publication number
- US20110030928A1 US20110030928A1 US12/850,452 US85045210A US2011030928A1 US 20110030928 A1 US20110030928 A1 US 20110030928A1 US 85045210 A US85045210 A US 85045210A US 2011030928 A1 US2011030928 A1 US 2011030928A1
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- US
- United States
- Prior art keywords
- flow
- fluid
- temperature
- volume
- channel
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
- H01L23/4735—Jet impingement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the invention relates to a cooling device for cooling a component comprising a heat sink and a housing having an inner chamber, wherein a volume-changing device is formed to withdraw fluid into the chamber and to expel the fluid from the chamber, the withdrawal causing a first flow and the expulsion causing vortices which form a second flow.
- the invention also relates to a method for operating the cooling device.
- a cooling device in which a preheating device is configured to convey first and second flows, and to increase the temperature of the first quantity of fluid entrained by the first flow during withdrawal of the fluid entrained by the first flow into a chamber, from an initial temperature to a first temperature, and to increase the temperature of a second quantity of fluid entrained by the second flow from the first temperature to a second temperature.
- the preheating device is advantageously arranged in thermal communication with the heat sink and is heated, e.g., by the electrical component arranged on the heat sink. This heating of the preheating device is used to heat the fluid, such as air, from an initial temperature to a first temperature when the flow is being drawn in. Cooling of the preheating device already occurs with this heating of the air, and therefore also cooling of the heat sink, which directly leads to an increase in the cooling power for the electrical component.
- the cooling device with the chamber has a first chamber and a second chamber. These two chambers, arranged in a housing, work with a volume-changing device according to the principle of a known synthetic jet drive.
- the preheating device comprises a first channel and a second channel.
- the first channel could therefore be connected to an outlet for a first chamber and the second channel to an outlet for a second chamber.
- the presently contemplated two-channel embodiment is advantageous since the two flows can be conveyed separately from one another.
- a volume of the first channel corresponds to the volume of the first fluid quantity.
- the delta of volume changes which is caused by the volume-changing device, to be adapted to the volume of the first channel.
- the cooling power it is thus useful to adapt the spatial content of the first channel to the volume that is drawn in through the chamber.
- a symmetrical layout of the volumes of the channels is useful, where the volumes of the channels should correspond to the volumes of the chambers, or the volume delta should correspond to the channel volume.
- the heat sink preheating device as an integral element and for a part of the heat flux flowing through the component into the heat sink to flow into the preheating device.
- the heat sink has a feed-through, which is arranged so that the second flow flows into the feed-through and the second fluid quantity entrained by the second flow is raised from the second temperature to a third temperature.
- the heat sink with its feed-through ensures further optimization of the increased cooling power.
- the air conveyed through the heat sink can be heated to a further higher temperature while flowing through the feed-through, and thereby preferably even achieve thermal saturation. Consequently, the amount of heat conveyed through the electrical component into the heat sink, by the flow flowing through the feed-through, can furthermore be extracted from the heat sink.
- the preheating device is arranged with a first end and a second end between an intake zone and the housing, where the first end is arranged on the housing and the second end is arranged at the intake zone between the heat sink and the second end.
- the cooling power can be optimized even further if the feed-through comprises a guide device for forcing turbulent convection.
- Turbulent convection which is known in physics as Rayleigh-Bénard convection, is a fluid-mechanical effect. In this process, a fluid is heated from below between two preferably horizontal plates and cooled from above. With a temperature difference beyond a certain level, turbulent convection occurs in which large-scale thermal structures are shed from the boundary layers and transport hot or cold fluid through a core region.
- optimization of noise reduction of the cooling device is achieved by providing a feed-through that comprises an exit zone in the region of an outlet opening, which is configured so that interference of sub-flows occur and sound compensation can be achieved.
- the feed-through is configured as an acoustic damper in the region of its exit zone.
- guide devices for the fluid which are arranged in the feed-through, such as baffle plates on an upper side and a lower side of the feed-through, also ensure corresponding interference of the emerging air vortices, so that sound waves are extinguished.
- noise-attenuating cooling of the processor contained in the laptop is advantageous.
- the heat sink comprises cooling plates on an outer side.
- the chamber furthermore comprise a third chamber and a fourth chamber.
- the housing with the four inner chambers is configured as an encapsulated synthetic jet drive with two drive systems.
- the particular advantage with this particular configuration of the synthetic jet drive system is that it is industrially compatible since it is configured tightly and is, thus, resistant to the entry of dust.
- the object of the invention is achieved by a method in accordance with the invention in which a first flow is conveyed through a preheating device, a temperature of a first quantity of fluid entrained by the first flow is increased from an initial temperature to a first temperature by the preheating device during withdrawal of the first fluid into a chamber, and the temperature of a second quantity of fluid entrained by the second flow is increased from the first temperature to a second temperature by the preheating device.
- a cooling power of, for example, an electrical component is therefore optimized. It should be noted that the method not only can be used for cooling electrical components, but may be employed in any technical apparatus in which heat developed by a heat source needs to be transported away as efficiently as possible from the heat source.
- the volume-changing device is driven so that it executes an oscillatory pattern of movement.
- the first movement direction it is expedient for the first movement direction to be maintained until the volume of the withdrawn first fluid quantity corresponds to the volume of the first channel of the preheating device.
- the second movement direction to be maintained until the expelled volume of the first quantity of fluid corresponds to the volume of the first channel of the preheating device and for an alternating exchange of fluid quantities from the preheating means to be performed.
- stepwise cooling occurs.
- an initial temperature for example, the temperature of the ambient air
- This increased temperature is in turn increased from the first temperature to a second temperature when passing again through the preheating device, and finally in a third step the second temperature is further increased to the third temperature.
- ambient air as the cooling fluid, this would mean that the cooling air used as ambient air reaches thermal saturation after the foregoing steps have been performed.
- Cooling can furthermore be optimized if the vortices are deflected by a guide device in the feed-through and turbulent convection is generated. Turbulent convection ensures more rapid cooling of the heat fluxes occurs at the boundary layers of the feed through.
- the cooling device i.e., operation of the volume-changing device inside the chamber in the housing
- bidirectional heat exchange is performed by the flows, the flows are conveyed separately as far as an exit zone and sound emission reduction occurs upon exit.
- FIG. 1 is a cross sectional illustration of a cooling device in accordance with an embodiment of the invention
- FIG. 2 is an illustration of a cooling device in accordance with an alternative embodiment of the invention.
- FIG. 3 is a plan view illustration of the cooling device of FIG. 2 ;
- FIG. 4 is an outline illustration of flow channels with a preheating zone in accordance with the disclosed embodiments of the invention.
- FIG. 5 is an outline illustration of a device for generating first flow and second flows in accordance with the contemplated embodiments of the invention
- FIG. 6 is an illustration of a perspective view of the cooling device of FIG. 2 ;
- FIG. 7 is an illustration of a perspective view of the cooling device in accordance with an alternative embodiment of the invention.
- FIG. 8 is an illustration of a method of in accordance with an embodiment of the invention.
- FIG. 1 A schematic representation of a cooling device 1 in accordance with the invention is shown in FIG. 1 .
- the cooling device 1 has as its main elements a housing 4 , a preheating device 8 and a heat sink 3 .
- a thermal conduction device 61 which is placed on an electrical component 2 , is arranged below the heat sink 3 .
- the electrical component 2 such as a flip chip BGA, is arranged on a printed circuit board 60 . During operation of the flip chip BGA, i.e., with a high power, the heat generated by the flip chip BGA must be dissipated by the thermal conduction device 61 through the heat sink 3 .
- the cooling device 1 Since efficient cooling of an electrical component can only be achieved by employing active fans, such as known radial fans, in order to optimize the cooling power of the heat sink 3 , the cooling device 1 has a housing 4 with an inner chamber 5 , which in turn comprises a first chamber 51 and a second chamber 52 .
- the volume-changing device 6 is configured as a piezo drive with two mobile diaphragms. The piezo drive allows a first movement direction 41 and a second movement direction 42 of the mobile diaphragms.
- a first flow 11 is conveyed through the preheating device 8 , a temperature of the first fluid quantity V 1 entrained by the first flow 11 being increased from an initial temperature to a first temperature by the preheating device 8 during withdrawal by the diaphragm of the fluid entrained by the first flow, and the temperature of the second fluid quantity V 2 entrained by the second flow 12 being increased from the first temperature T 1 to a second temperature T 2 by the preheating device 8 .
- the first flow 11 is conveyed through the first channel 21 and the second flow 12 is conveyed separately through the second channel 22 .
- the first flow 11 and the second flow 12 are conveyed alternately through the first channel 21 and the second channel 22 , which is represented in FIG. 1 as a further first flow 11 ′ and a further second flow 12 ′.
- the first flow 11 and the second flow 12 corresponding thereto are represented as solid lines, and the further first flow 11 ′ and the further second flow 12 ′ corresponding thereto are represented as dashed lines.
- the volume-changing device 6 During an intake process by the volume-changing device 6 , with the movement direction 41 being executed, a negative pressure is created in the first chamber 51 and the first flow 11 can therefore be drawn through the first channel 21 into the first chamber 51 .
- the volume-changing device 6 , the first chamber 51 and the length of the movement direction 41 are configuration so that the delta volume resulting from the movement corresponds to the volume of the first channel 21 .
- air will now be referred to.
- the air quantity drawn in with the first flow 11 now lies only in the first channel 21 and fills its volume entirely, and during the intake and a residence time of the air quantity in the first channel 21 , the air is heated from an initial temperature T 0 to a first temperature T 1 .
- the air functions as cooling air.
- the second flow 12 is conveyed through the second channel 22 by the volume-changing device 6 with the aid of the second chamber 52 and its opening.
- vortices 7 are created by the expulsion (see FIG. 5 ).
- These vortices 7 correspond to a second air quantity V 2 , which can be heated from the first temperature T 1 to a second temperature T 2 while flowing through the second channel 22 .
- the vortices 7 in the form of the second flow 12 , flow past an intake zone 9 due to their higher speed, and are guided into the heat sink 3 .
- the heat sink 3 has a feed-through 3 a.
- Guide devices for guiding the flowing air are arranged inside the feed-through 3 a .
- upper baffle plates 30 b are arranged in the upper part of the feed-through 3 a
- lower baffle plates 30 a are arranged in the lower part of the feed-through 3 a . Guiding the second flow 12 through the feed-through 3 a allows the cooling air, which has already been heated to the second temperature T 2 , to increase again. The cooling air temperature is heated from the second temperature T 2 to the third temperature T 3 when flowing through the feed-through 3 a.
- the guide devices i.e., upper baffle plates 30 b and lower baffle plates 30 a , ensure that the first flow 12 enters into turbulent convection 13 .
- the turbulent convection sets in which is reinforced by the guide devices, thermal structures being shed from the boundary layers of the feed-through 3 a and hotter fluid or the air being transported into a core region of the flow, so that a cooling power of the heat sink 3 is optimized.
- the cooling process has been explained above with reference to the example of the first flow 11 and the second flow 12 . Since the volume-changing device 6 executes an oscillating movement pattern, the flow properties and the temperature increase may be explained similarly for the further first flow 11 ′ and the further second flow 12 ′.
- the heat sink 3 has cooling plates 71 , . . . , 76 on its outer side. These additional open cooling plates 71 , . . . , 76 on the outer side of the heat sink 3 , and therefore on the outer side of the feed-through 3 a , reinforce the cooling power of the heat sink 3 by natural convection of the ambient air.
- the thermal dissipation capacity of the cooling plates 71 , . . . , 76 determines a working point (ambient temperature) for the use of the cooling device 1 , in combination with the forced convection described above.
- FIG. 2 is schematic illustration of an alternative embodiment of the cooling device 1 in a lateral sectional representation.
- the first channel 21 and the second channel 22 of the presently contemplated embodiment are now arranged next to one another so that only the first channel 21 can be seen in FIG. 2 .
- the cooling device 1 comprises the housing 4 with the inner chamber 5 , the preheating device 8 with an intake zone 9 and the heat sink 3 with the feed-through 3 a .
- An axis of symmetry is indicated symbolically through the first channel 21 .
- the second flow 12 and the further second flow 12 ′ will respectively move around this axis.
- a first baffle plate 31 , a second baffle plate 32 , a third baffle plate 33 , a fourth baffle plate 34 and a fifth baffle plate 35 are arranged as seen from left to right.
- the baffle plates 31 , 33 , 35 form the upper baffle plates and the baffle plates 32 and 34 form the lower baffle plates.
- FIG. 3 is a schematic plan view illustration of the cooling device of FIG. 2 .
- the channel 22 arranged beside the first channel 21 can be seen.
- the channels 21 , 22 are respectively configured to taper in the flow direction, so that the Bernoulli effect becomes significant.
- the first flow 11 can be drawn into the first channel 21 and the further first flow 11 ′ can be drawn into the second channel 22 through the intake zone 9 . Due to the movement in opposite directions of the volume-changing device 6 according to FIG. 1 , as in a two-stroke motor, intake occurs through the first channel 21 while expulsion occurs through the second channel 22 , and vice versa.
- FIG. 2 shows that the feed-through 3 a has a first inlet opening and a second inlet opening, the cross sections of the inlet openings increasing in the flow direction. This increase occurs approximately over half of the feed-through 3 a , and beyond this half the flows previously guided forcibly are combined into a common flow. Their combination creates interferences which are promoted by the arrangement of the third, fourth and fifth baffle plates 31 , 34 , 35 so that sound emission is achieved for the flowing air upon exit from the exit zone 10 .
- the second alternative exemplary embodiment of a cooling device 1 has the difference in this representation of channel bends for the first channel 21 and the second channel 22 .
- the known devices for generating the flows which are arranged inside the housing 4 , are respectively in communication by their above-described openings with the first channel 21 and the second channel 22 .
- the housing 4 is therefore connected through the channels 21 , 22 to a first end 8 a of the preheating device 8 .
- the channels 21 and 22 are guided separately from one another as far as a second end 8 b of the preheating device 8 .
- Between the second end 8 b and the heat sink 3 there is a gap that is configured as the intake zone 9 .
- the preheating device 8 is configured as an integral element of the heat sink 3 .
- the heat flux flowing in the heat sink 3 due to a heat source (electrical component 2 ) can therefore also flow into the preheating device 8 , heat it and with the channels heat the ambient air flowing through the channels 21 , 22 .
- the first flow 11 is sucked through the intake zone 9 into the first channel 21 .
- the second flow 12 is expelled as a vortex flow through the second channel 22 and guided into the feed-through 3 a .
- the feed-through 3 a has longitudinally arranged guide devices, such as guide plates.
- the heat sink 3 has cooling plates 71 , . . . , 76 on its outer side.
- FIG. 7 Another exemplary embodiment of the cooling device 1 is shown in FIG. 7 in a perspective representation.
- the channels 21 and 22 wind through the heat sink 3 and the preheating device 8 in a meandering manner.
- the key feature is that the heat sink 3 has a first cooling plate 71 and a second cooling plate 76 for a lateral boundary. There is therefore a wide channel for natural convection of the ambient air at the two plates 71 , 76 .
- the preheating device 8 as a preheating zone is now not arranged in series with the heat sink but lies below the actual heat sink 3 , although it is still thermally connected to the heat sink 3 and its cooling plates 71 , 76 .
- FIG. 4 is a schematic illustration of a configuration of feed-through 3 a in accordance with an embodiment of the invention.
- the second flow 12 flows out of the first channel 21 and the further second flow 12 ′ flows out of the second channel 22 , in the direction of the feed-through 3 a .
- the feed-through 3 a has a first opening and a second opening. These two openings convey the second flow 12 and the further second flow 12 ′ separately as far as a first baffle plate 31 .
- the second flow 12 and the second flow 12 ′ are combined, and these two combined flows can arrive at a second baffle plate 32 , arranged further downstream as seen in the flow direction, and be prepared for preferably turbulent convection 13 , or they may already have been vortexed.
- a third baffle plate 33 Arranged further along in the flow direction, there is a third baffle plate 33 and, further downstream in the flow direction, there is a fourth baffle plate 34 in the region of an exit zone 10 .
- FIG. 5 represents a housing 4 that is configured internally so as to fulfill the function of a synthetic jet drive.
- This synthetic jet drive comprises a first chamber 51 , a second chamber 52 , a third chamber 53 and a fourth chamber 54 .
- the first chamber 51 and the third chamber 53 each have an opening for intake and ejection of the fluid.
- a first flow 11 and a further first flow 11 ′ are drawn in through the openings.
- the two chambers 51 and 53 operate reciprocally, i.e., when a first flow 11 is being drawn in through the opening of the chamber 51 the second flow 12 is expelled through the opening of the chamber 53 .
- the second flow 12 may be formed by a series of vortices 7 , which vortices 7 may flow, for example, as bubbles or rings with a faster speed through the fluid.
- the first chamber 51 is separated from the second chamber 52 by the volume-changing device 6 .
- the third chamber 53 is separated from the fourth chamber 54 by a further volume-changing device 6 ′.
- the key feature of this four-chamber alternative embodiment is that the second chamber 52 is in communication with the fourth chamber 54 through a bypass channel 55 .
- This advantageous alternative configuration allows a dust tight synthetic jet drive to be formed inside the housing 4 . That is, the volume-changing devices 6 , 6 ′, which are configured, for example, as piezo elements, are not exposed to dusty air. Harsh and robust environmental conditions prevail especially in process automation in the industrial field, where ambient air which is used as cooling air may be strongly laden with dust and moisture.
- the particular feature of this four-chamber configuration is that the ambient air is guided by the first flow 11 into first chamber 51 and is separated by a diaphragm of the volume-changing device 6 from the first chamber latter. Dirt from the ambient air can therefore be deposited in the chamber 51 without compromising the volume-changing device 6 .
- This second chamber 52 is in hermetic communication with the fourth channel 54 through the bypass channel 55 .
- the fourth chamber 54 in turn contains the further volume-changing device 6 ′, so that the volume-changing device 6 ′ likewise does not come in contact with an ambient fluid, such as dusty air. Again, only the chamber 53 can come in contact with dusty air, and the dust can be deposited in the chamber 53 without causing damage.
- FIG. 8 is a flow chart of a method for operating a cooling device in which a volume-changing device is movably arranged in a housing having an inner chamber.
- the method comprises moving the volume-charging device in the housing so that a fluid is withdrawn into the chamber in a first movement direction to cause a first flow of the fluid and so that the fluid is expelled from the chamber in a second movement direction to form vortices which cause a second flow, as indicated in step 810 .
- the first flow is conveyed through a preheating device, as indicated in step 820 .
- the temperature of a first quantity of fluid entrained by the first flow is increased from an initial temperature to a first temperature by the preheating device during the withdrawal.
- the second flow through the preheating device as indicated in step 830 .
- the temperature of a second quantity of fluid entrained by the second flow being increased from the first temperature to a second temperature by the preheating device during the expulsion.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EPEP09167251 | 2009-08-05 | ||
EP09167251A EP2282335A1 (de) | 2009-08-05 | 2009-08-05 | Kühlvorrichtung und Verfahren |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110030928A1 true US20110030928A1 (en) | 2011-02-10 |
Family
ID=41566130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/850,452 Abandoned US20110030928A1 (en) | 2009-08-05 | 2010-08-04 | Cooling Device and Method |
Country Status (3)
Country | Link |
---|---|
US (1) | US20110030928A1 (zh) |
EP (1) | EP2282335A1 (zh) |
CN (1) | CN101996965B (zh) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150101886A1 (en) * | 2013-10-16 | 2015-04-16 | The Boeing Company | Synthetic jet muffler |
CN106411107A (zh) * | 2015-08-03 | 2017-02-15 | 株式会社日立制作所 | 电力转换装置 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2819159A1 (en) * | 2013-06-27 | 2014-12-31 | Alcatel Lucent | Cooling technique |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5758823A (en) * | 1995-06-12 | 1998-06-02 | Georgia Tech Research Corporation | Synthetic jet actuator and applications thereof |
US6588497B1 (en) * | 2002-04-19 | 2003-07-08 | Georgia Tech Research Corporation | System and method for thermal management by synthetic jet ejector channel cooling techniques |
US20060237171A1 (en) * | 2005-04-21 | 2006-10-26 | Tomoharu Mukasa | Jet generating device and electronic apparatus |
US20070119573A1 (en) * | 2005-11-18 | 2007-05-31 | Innovative Fluidics, Inc. | Synthetic jet ejector for the thermal management of PCI cards |
US7252140B2 (en) * | 2004-09-03 | 2007-08-07 | Nuveatix, Inc. | Apparatus and method for enhanced heat transfer |
US20080017350A1 (en) * | 2006-07-21 | 2008-01-24 | Foxconn Technology Co., Ltd. | Heat sink |
US20090086416A1 (en) * | 2005-04-18 | 2009-04-02 | Sony Corporation | Vibrating device, jet flow generating device, electronic device, and manufacturing method of vibrating device |
US20090219686A1 (en) * | 2004-03-18 | 2009-09-03 | Hiroichi Ishikawa | Gas ejector, electronic device, and gas-ejecting method |
-
2009
- 2009-08-05 EP EP09167251A patent/EP2282335A1/de not_active Withdrawn
-
2010
- 2010-08-04 CN CN201010246403.6A patent/CN101996965B/zh not_active Expired - Fee Related
- 2010-08-04 US US12/850,452 patent/US20110030928A1/en not_active Abandoned
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5758823A (en) * | 1995-06-12 | 1998-06-02 | Georgia Tech Research Corporation | Synthetic jet actuator and applications thereof |
US5988522A (en) * | 1995-06-12 | 1999-11-23 | Georgia Tech Research Corporation | Synthetic jet actuators for modifiying the direction of fluid flows |
US6588497B1 (en) * | 2002-04-19 | 2003-07-08 | Georgia Tech Research Corporation | System and method for thermal management by synthetic jet ejector channel cooling techniques |
US20090219686A1 (en) * | 2004-03-18 | 2009-09-03 | Hiroichi Ishikawa | Gas ejector, electronic device, and gas-ejecting method |
US7252140B2 (en) * | 2004-09-03 | 2007-08-07 | Nuveatix, Inc. | Apparatus and method for enhanced heat transfer |
US20090086416A1 (en) * | 2005-04-18 | 2009-04-02 | Sony Corporation | Vibrating device, jet flow generating device, electronic device, and manufacturing method of vibrating device |
US20060237171A1 (en) * | 2005-04-21 | 2006-10-26 | Tomoharu Mukasa | Jet generating device and electronic apparatus |
US20070119573A1 (en) * | 2005-11-18 | 2007-05-31 | Innovative Fluidics, Inc. | Synthetic jet ejector for the thermal management of PCI cards |
US20080017350A1 (en) * | 2006-07-21 | 2008-01-24 | Foxconn Technology Co., Ltd. | Heat sink |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150101886A1 (en) * | 2013-10-16 | 2015-04-16 | The Boeing Company | Synthetic jet muffler |
US9027702B2 (en) * | 2013-10-16 | 2015-05-12 | The Boeing Company | Synthetic jet muffler |
CN106411107A (zh) * | 2015-08-03 | 2017-02-15 | 株式会社日立制作所 | 电力转换装置 |
Also Published As
Publication number | Publication date |
---|---|
EP2282335A1 (de) | 2011-02-09 |
CN101996965A (zh) | 2011-03-30 |
CN101996965B (zh) | 2015-04-15 |
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Owner name: SIEMENS AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BLEIWEISS, HEINZ;REEL/FRAME:024790/0421 Effective date: 20100716 |
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