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WO2008067585A1 - Pompes ferrofluidiques - Google Patents

Pompes ferrofluidiques Download PDF

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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
Application number
PCT/AU2007/001808
Other languages
English (en)
Inventor
Cedric Robillot
Brett Thomas Kettle
Klaus Stefan Drese
Dalibor Dadic
Original Assignee
Cleveland Biosensors Pty Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from AU2006906807A external-priority patent/AU2006906807A0/en
Application filed by Cleveland Biosensors Pty Ltd filed Critical Cleveland Biosensors Pty Ltd
Publication of WO2008067585A1 publication Critical patent/WO2008067585A1/fr

Links

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.
PCT/AU2007/001808 2006-12-05 2007-11-23 Pompes ferrofluidiques WO2008067585A1 (fr)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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