# Measurement of velocity fluctuations in microfluidics with simultaneously ultrahigh spatial and temporal resolution

Measurement of velocity fluctuations in microfluidics with simultaneously ultrahigh spatial and... Although unsteady and electrokinetic flows are widely used in microfluidics, there is unfortunately no velocimeter today that can measure the random velocity fluctuation at high temporal and spatial resolution simultaneously in microfluidics. Here we, for the first time, theoretically study the temporal resolution of laser induced fluorescence photobleaching anemometer (LIFPA) and experimentally verify that LIFPA can have simultaneously ultrahigh temporal $$({\sim } 4\,\upmu \hbox {s})$$ ( ∼ 4 μ s ) and spatial $$({\sim }203\,\hbox {nm})$$ ( ∼ 203 nm ) resolution and can measure velocity fluctuation up to at least 2 kHz, whose corresponding wave number is about $$6\times 10^6\,{/}\hbox {m}$$ 6 × 10 6 / m in an electrokinetically forced unsteady flow in microfluidics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

# Measurement of velocity fluctuations in microfluidics with simultaneously ultrahigh spatial and temporal resolution

, Volume 57 (1) – Dec 26, 2015
12 pages

/lp/springer_journal/measurement-of-velocity-fluctuations-in-microfluidics-with-PyCJVfWAOm
Publisher
Springer Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-015-2106-4
Publisher site
See Article on Publisher Site

### Abstract

Although unsteady and electrokinetic flows are widely used in microfluidics, there is unfortunately no velocimeter today that can measure the random velocity fluctuation at high temporal and spatial resolution simultaneously in microfluidics. Here we, for the first time, theoretically study the temporal resolution of laser induced fluorescence photobleaching anemometer (LIFPA) and experimentally verify that LIFPA can have simultaneously ultrahigh temporal $$({\sim } 4\,\upmu \hbox {s})$$ ( ∼ 4 μ s ) and spatial $$({\sim }203\,\hbox {nm})$$ ( ∼ 203 nm ) resolution and can measure velocity fluctuation up to at least 2 kHz, whose corresponding wave number is about $$6\times 10^6\,{/}\hbox {m}$$ 6 × 10 6 / m in an electrokinetically forced unsteady flow in microfluidics.

### Journal

Experiments in FluidsSpringer Journals

Published: Dec 26, 2015

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