MicroPIV measurements of turbulent flow in square microchannels with hydraulic diameters from 200μm to 640μm

Li, Hao; Olsen, Michael G.

doi:10.1016/j.ijheatfluidflow.2005.02.003

Cited by 54 publications

(33 citation statements)

References 40 publications

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“…Micro particle image velocimetry (μ-PIV) was used to measure the velocity fields inside the microchannel at various downstream locations [21]- [23]. A double pulsed 532 nm Nd:YAG laser beam (Continuum, Santa Clara, CA), attenuated to 3 mJ/pulse, was utilized in the measurements.…”

Section: E μ-Piv Velocity Field Measurementsmentioning

confidence: 99%

A Continuous-Flow Polymerase Chain Reaction Microchip With Regional Velocity Control

Fozdar

Ali

et al. 2006

J. Microelectromech. Syst.

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This paper presents a continuous-flow polymerase chain reaction (PCR) microchip with a serpentine microchannel of varying width for "regional velocity control." Varying the channel width by incorporating expanding and contracting conduits made it possible to control DNA sample velocities for the optimization of the exposure times of the sample to each temperature phase while minimizing the transitional periods during temperature transitions. A finite element analysis (FEA) and semianalytical heat transfer model was used to determine the distances between the three heating assemblies that are responsible for creating the denaturation (96 °C), hybridization (60 °C), and extension (72 °C) temperature zones within the microchip. Predictions from the thermal FEA and semi-analytical model were compared with temperature measurements obtained from an infrared (IR) camera. Flow-field FEAs were also performed to predict the velocity distributions in the regions of the expanding and contracting conduits to study the effects of the microchannel geometry on flow recirculation and bubble nucleation. The flow fields were empirically studied using micro particle image velocimetry (μ-PIV) to validate the flow-field FEA's and to determine experimental velocities in each of the regions of different width. Successful amplification of a 90 base pair (bp) bacillus anthracis DNA fragment was achieved.

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Section: E μ-Piv Velocity Field Measurementsmentioning

confidence: 99%

A Continuous-Flow Polymerase Chain Reaction Microchip With Regional Velocity Control

Fozdar

Ali

et al. 2006

J. Microelectromech. Syst.

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“…17 Further details of the micro-PIV system can be found in Li and Olsen. 18 The overlapped area of adjacent interrogation windows was 50% resulting in an in-plane velocity vector spacing of 1.5 lm. In total, 1500 micro-PIV image pairs were captured at each depth and analyzed using the sum-of-correlation algorithm [19][20][21] to obtain the velocity field.…”

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confidence: 99%

Nanoscale surface roughness affects low Reynolds number flow: Experiments and modeling

Jaeger

Ren

Xie

et al. 2012

Applied Physics Letters

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Most micro-channel fabrication strategies generate nano-to-micro-scale, stochastic surface roughness. This inherent stochasticity can potentially be harnessed to direct microfluidic operations such as self-cleaning behavior and localized mixing. This work investigates the effect of stochastic nanoscale roughness on low to moderate Reynolds number Newtonian flow using concurrent modeling and experiments. We fabricate a microscopic channel with tailored hydrofluoric-acid-etched rough surfaces. Optical profilometry and micro-particle-image-velocimetry (micro-PIV) are used to characterize the surface roughness and flow field and is integrated with direct numerical simulation that resolves effects of nanoscale roughness. Results indicate that nanoscale roughness causes flow perturbations that extend up to the mid-plane and is insensitive to flow-rates.

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“…Further details of the microPIV system and the experimental methodology can be found in the literature. 20,21 The microPIV data were used to evaluate the accuracy of using existing CFD models in simulating the flow within the MIVR. Laminar simulations were performed for low Reynolds number cases, and large eddy simulations ͑LESs͒ using the Smagorinsky-Lilly subgrid model 22,23 were performed for the higher Reynolds number cases.…”

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confidence: 99%

A microscale multi-inlet vortex nanoprecipitation reactor: Turbulence measurement and simulation

2009

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MicroPIV measurements of turbulent flow in square microchannels with hydraulic diameters from 200μm to 640μm

Cited by 54 publications

References 40 publications

A Continuous-Flow Polymerase Chain Reaction Microchip With Regional Velocity Control

A Continuous-Flow Polymerase Chain Reaction Microchip With Regional Velocity Control

Nanoscale surface roughness affects low Reynolds number flow: Experiments and modeling

A microscale multi-inlet vortex nanoprecipitation reactor: Turbulence measurement and simulation

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