DocumentCode :
3424146
Title :
High speed microfluidic doublet flow in open pools driven by non-contact micromachined thermal sources
Author :
Basu, Amar S. ; Gianchandani, Yogesh B.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
fYear :
2005
fDate :
30 Jan.-3 Feb. 2005
Firstpage :
666
Lastpage :
669
Abstract :
We report a phenomenon in which a micromachined heat source placed less than 50 μm above the surface of a liquid drives a high-speed doublet flow pattern with linear velocities reaching nearly 5 mm/sec and rotational velocities up to 1200 rpm. Tests were performed on a 50-100 μm-thick layer of water containing 3 μm polystyrene beads for flow visualization. The thermal source is a polyimide cantilever with an integrated heater near the tip, operated with input powers ranging from 0-32 mW. It has no moving parts and does not contact the liquid. The speed of the doublet flow scales with input power as well as liquid temperature, and is inversely related to the air gap between the heater and liquid surface. The orientation of the doublet flow can be reversed by changing the angle of the cantilever. A one-dimensional array of probes used in the same manner generates a linear flow pattern.
Keywords :
flow visualisation; microfluidics; micromachining; nanopatterning; 0 to 32 mW; 1D probe array; 3 micron; 50 to 100 micron; air gap; flow pattern; flow visualization; heater; linear velocity; liquid surface; liquid temperature; microfluidic doublet flow; micromachined heat source; noncontact micromachined thermal sources; open pools; polyimide cantilever; polystyrene beads; rotational velocity; Drives; Fiber lasers; Heat engines; Microfluidics; Probes; Pump lasers; Resistance heating; Surface contamination; Testing; Thermal engineering;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Micro Electro Mechanical Systems, 2005. MEMS 2005. 18th IEEE International Conference on
ISSN :
1084-6999
Print_ISBN :
0-7803-8732-5
Type :
conf
DOI :
10.1109/MEMSYS.2005.1454017
Filename :
1454017
Link To Document :
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