Loading...

Diffuser miniature pump with an extra ferrofluidic valve

Ashouri, M ; Sharif University of Technology | 2015

723 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s10404-015-1642-9
  3. Publisher: Springer Verlag , 2015
  4. Abstract:
  5. This paper presents the prototype design and fabrication of a magnetically actuated miniature pump that utilizes self-sealing capability of ferrofluid-covered permanent magnets in both pumping and valving mechanisms. The valving action is performed by employing one active valve along with two nozzle/diffuser elements. Two cylindrical permanent magnets are placed inside the flat-wall channels: One magnet acts as the active valve and the other one serves as a reciprocating piston actuating the working fluid. In order to seal the gaps between the channel walls and the permanent magnet of the valve/piston, ferrofluid is used to cover the surfaces of both magnets. The valve and the piston are actuated using external permanent magnets driven by two separate stepper motors. Working with a stroke length of 20 mm at a driving frequency of 0.5 Hz, the pump is able to achieve a maximum flow rate of 1310 µL/min and a maximum 66 mm of water backpressure. The contactless external actuation feature of the design enables integration of the pump with other PMMA-based microfluidic systems with low cost and disposability
  6. Keywords:
  7. Magnetic actuators ; Permanent magnets ; Pistons ; Pumps ; Stepping motors ; Active valves ; Driving frequencies ; Ferrofluid ; Maximum flow rate ; Micro fluidic system ; Micro pump ; PMMA channel ; Prototype designs ; Magnets
  8. Source: Microfluidics and Nanofluidics ; Volume 19, Issue 5 , November , 2015 , Pages 1235-1244 ; 16134982 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10404-015-1642-9