Microfluidic bulk flow determinations based on converting...

Details Microfluidic bulk flow determinations based on converting... Microfluidic bulk flow determinations based on converting...

2005-08-30

2005-08-30

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring transit time of tracer or tag

Reexamination Certificate

active

06935192

ABSTRACT:
The fluid flow rate within a microfluidic passageway of a microfabricated device is determined by measuring the time-of-flight of a heat pulse coupled into the fluid. Since the propagation velocity of the heat trace is generally slower than the mean flow rate of the flow, additional processing provides the appropriate scaling needed to obtain an accurate fluid flow rate measurement. The scaling factor is based on the geometry of the structure and the thermal properties of the fluid and the materials used for the device.

REFERENCES:
patent: 6386050 (2002-05-01), Yin et al.
patent: 6645428 (2003-11-01), Morris et al.
patent: WO 01/90700 (2001-05-01), None
Kurzweg, U.H., et al., “Flow Rate Determination in Conduits Using a Thermal Pulse Technique,” Int. Comm. Heat Mass Transfer, vol. 24, No. 2, pp. 211-221, 1997.
Kurzweg, U.H., et al., “Thermal Pulse Propagation and Dispersion in Laminar Flow Within Conduits of Finite Wall Conductivity,” Int. J. Heat Mass Transfer, vol. 40, No. 6, pp. 1391-1400, 1997.

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