WO2008067585A1 - Pompes ferrofluidiques - Google Patents
Pompes ferrofluidiques Download PDFInfo
- Publication number
- WO2008067585A1 WO2008067585A1 PCT/AU2007/001808 AU2007001808W WO2008067585A1 WO 2008067585 A1 WO2008067585 A1 WO 2008067585A1 AU 2007001808 W AU2007001808 W AU 2007001808W WO 2008067585 A1 WO2008067585 A1 WO 2008067585A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channel
- ferrofluidic
- pump
- walls
- ferrofluidic pump
- Prior art date
Links
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 13
- 230000005291 magnetic effect Effects 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 7
- 239000011324 bead Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011554 ferrofluid Substances 0.000 description 3
- 241000237858 Gastropoda Species 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000004166 bioassay Methods 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
- F04B19/006—Micropumps
Definitions
- This invention relates to the design of ferrofluidic pumps.
- it relates to ferrofluidic pumps that are useful in microfluidic devices in which fluids are impelled through microchannels under the influence of the ferrofluidic pumps.
- Ferrofluidic pumps are known to generate a suitable pumping force for many applications. We have recently described the use of ferrofluidic pumps in a microfluidic device useful for conducting bioassays. In our co- pending publication number WO2006/034525 we describe a number of different embodiments of microfluidic devices and various pumping schemes.
- a ferrofluidic pump uses an externally generated magnetic field to move a slug of ferrofluid through a pump channel.
- the force generated by the moving slug causes a pressure differential in the channel that simultaneously pushes and pulls fluids through channels in communication with the pump.
- the magnetic field is usually generated by a movable permanent magnet although controlled electromagnets are also suitable. In this way the pump exerts a resistance when the magnet is stationary and generates a motive force when the magnet is moved.
- the magnet can be moved in either direction and the rate of movement can be varied. The pump is therefore reversible and variable.
- the strength of the pump (that is the maximum pressure it can withstand or generate) is a function of a number of parameters including the strength and distribution of the magnetic field and the composition of the ferrofluid, but it is also directly related to the critical dimensions of the pump channel and by the surface tension which is directly related to the contact area between the ferrofluid and the channel. It is evident that a lower channel dimension is desirable to increase the strength of the pump but a larger channel dimension is desirable for larger flow rate. These competing considerations limit the applications of ferrofluidic pumps.
- Microfluidic applications such as those described in our co-pending application, place ever greater demands on ferrofluidic pumps.
- Conventional pumps are not able to meet performance demands for a range of fluids and applications for the reasons discussed above. This is particularly problematic for viscous fluids, such as blood.
- a ferrofluidic pump comprising: a generally elongate channel; a ferromagnetic slug movable within the channel under the influence of a magnetic field; and one or more walls within the channel that divides the ferromagnetic slug across the channel.
- a single elongate wall disposed generally along an axis of the channel.
- Fig 1 is a sketch of a first embodiment of a ferrofluidic pump
- Fig 2 is a sketch of a second embodiment of a ferrofluidic pump
- Fig 3 is a sketch of a third embodiment of a ferrofluidic pump
- Fig 4 is a sketch of a fourth embodiment of a ferrofluidic pump
- Fig 5 is an end view of the embodiment of Fig 1 ;
- Fig 6 is an end view of a variation to the embodiment of Fig 5;
- Fig 7 is a sketch of a microfluidic device incorporating the ferrofluidic pump.
- a ferrofluidic pump 10 comprising a channel 11 in which a ferromagnetic slug 12 is moved to the right under the influence of an external magnetic field 13, as shown by the long arrows in Fig 1.
- An elongate wall 14 is disposed generally along the primary axis of the channel 11.
- P2 applied on one side of the slug
- P1 applied to the other side.
- the force exerted on the ferrofluidic slug (in the absence of the wall) is proportional to the cross-sectional area of the channel which is proportional to the square of the channel diameter.
- the surface tension is proportional to the contact area between the fluid and the channel and is therefore proportional to the diameter.
- the ferrofluidic pump 10 of Fig 1 has a significant advantage over known pumps because the pump can handle a much greater pressure differential without a significant drop in flow rate capacity.
- a straight thin wall such as shown in Fig 1, is the simplest structure to provide advantage.
- the inventors realize that other structures will also achieve the advantage.
- the inventors speculate that some structures may provide other advantages, either in ease of manufacture or in pump performance.
- FIG. 1 shows a ferrofluidic pump 20 comprising a channel 11 in which a ferromagnetic slug 12 is moved under the influence of an external magnetic field 13.
- a corrugated wall 24 is disposed generally along the primary axis of the channel 11. The cross-sectional area of the slugs varies as the slugs move through the channel 11 but the flow rate remains constant.
- FIG. 3 shows a ferrofluidic pump 30 comprising a channel 11 in which a ferromagnetic slug 12 is moved under the influence of an external magnetic field 13.
- a wall 34 is formed from a series of abutting beads or pillars disposed generally along the primary axis of the channel 11. The inventors speculate that a series of beads or pillars may be easier to manufacture than a solid wall.
- FIG. 4 shows a ferrofluidic pump 40 comprising a channel 11 in which a ferromagnetic slug 12 is moved under the influence of an external magnetic field 13.
- a wall 44 is formed from a series of short walls disposed generally along the primary axis of the channel 11. The embodiment of Fig 4 shows that the wall need not be continuous for an advantage to be achieved.
- Fig 5 shows a cross-sectional end view of a similar pump to that shown in Fig 1.
- An elongate wall 54 is formed within the channel 11 across the short dimension of the pump body.
- the wall 54 can be formed at any angle but the embodiment shown in Fig 5 may present less manufacturing challenges. Nonetheless, the wall need not be manufactured as a single simple structure but could be in the form of a cross 64 as shown in Fig 6.
- the invention is any structural feature that increases the surface tension by reducing the cross-sectional area and increasing the perimeter of the cross-section without significantly reducing the flow rate.
- the preferred embodiments are walls or wall-like structures but discontinuance structures, such as the embodiment of Fig 4, are also envisaged.
- Fig 7 shows a microfluidic device 70 in which a ferrofluidic pump 71 moves fluid 72 through a microchannel 73.
- the pump 71 may be any of the embodiments described above or a variation within the broad scope of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
La présente invention concerne une pompe ferrofluidique constituée d'un pion ferromagnétique mobile à l'intérieur d'un canal de forme globalement allongée sous l'influence d'un champ magnétique externe avec une ou des parois dans le passage qui sépare(nt) le pion ferromagnétique à travers le canal. La paroi réduit la section transversale mais accroît la tension superficielle sans réduire le débit de manière significative.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2006906807 | 2006-12-05 | ||
AU2006906807A AU2006906807A0 (en) | 2006-12-05 | Ferrofluidic pumps |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008067585A1 true WO2008067585A1 (fr) | 2008-06-12 |
Family
ID=39491554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2007/001808 WO2008067585A1 (fr) | 2006-12-05 | 2007-11-23 | Pompes ferrofluidiques |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2008067585A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9157460B2 (en) | 2012-06-05 | 2015-10-13 | Toyota Motor Engineering & Manufacturing North America, Inc. | Controlling a fluid flow with a magnetic field |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6318970B1 (en) * | 1998-03-12 | 2001-11-20 | Micralyne Inc. | Fluidic devices |
US6408884B1 (en) * | 1999-12-15 | 2002-06-25 | University Of Washington | Magnetically actuated fluid handling devices for microfluidic applications |
US6720710B1 (en) * | 1996-01-05 | 2004-04-13 | Berkeley Microinstruments, Inc. | Micropump |
US6797187B1 (en) * | 2000-11-13 | 2004-09-28 | Sandia Corporation | Surface-micromachined microfluidic devices |
WO2006034525A1 (fr) * | 2004-09-28 | 2006-04-06 | Cleveland Biosensors Pty Ltd | Dispositif microfluidique |
-
2007
- 2007-11-23 WO PCT/AU2007/001808 patent/WO2008067585A1/fr active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6720710B1 (en) * | 1996-01-05 | 2004-04-13 | Berkeley Microinstruments, Inc. | Micropump |
US6318970B1 (en) * | 1998-03-12 | 2001-11-20 | Micralyne Inc. | Fluidic devices |
US6408884B1 (en) * | 1999-12-15 | 2002-06-25 | University Of Washington | Magnetically actuated fluid handling devices for microfluidic applications |
US6797187B1 (en) * | 2000-11-13 | 2004-09-28 | Sandia Corporation | Surface-micromachined microfluidic devices |
WO2006034525A1 (fr) * | 2004-09-28 | 2006-04-06 | Cleveland Biosensors Pty Ltd | Dispositif microfluidique |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9157460B2 (en) | 2012-06-05 | 2015-10-13 | Toyota Motor Engineering & Manufacturing North America, Inc. | Controlling a fluid flow with a magnetic field |
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