In the current work, the mixing of a diffusive passive-scalar, e.g., thermal energy or species concentration, driven by electro-osmotic fluid motion being induced by an applied potential across a micro-channel is studied numerically. Secondary time-dependent periodic or random electric fields, orthogonal to the main stream, are applied to generate cross-sectional mixing. This investigation focuses on the mixing dynamics and its dependence on the frequency (period) of the driving mechanism. For periodic flows, the probability density function (PDF) of the scaled passive scalar (i.e., concentration), settles into a self-similar curve showing spatially repeating patterns. In contrast, for random flows there is a lack of self-similarity in the PDF for the interval of time considered in this investigation. The present study confirms an exponential decay of the variance of the concentration for the periodic and random flows.
Skip Nav Destination
ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences
July 19–23, 2009
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4358-1
PROCEEDINGS PAPER
Rate of Decay of a Passive Scalar in a Micro-Mixer and the Frequency of the Advecting Velocity Fields
J. Rafael Pacheco,
J. Rafael Pacheco
Arizona State University, Tempe, AZ
Search for other works by this author on:
KangPing Chen,
KangPing Chen
Arizona State University, Tempe, AZ
Search for other works by this author on:
Arturo Pacheco-Vega
Arturo Pacheco-Vega
California State University, Los Angeles, Los Angeles, CA
Search for other works by this author on:
J. Rafael Pacheco
Arizona State University, Tempe, AZ
KangPing Chen
Arizona State University, Tempe, AZ
Arturo Pacheco-Vega
California State University, Los Angeles, Los Angeles, CA
Paper No:
HT2009-88626, pp. 527-535; 9 pages
Published Online:
March 12, 2010
Citation
Pacheco, JR, Chen, K, & Pacheco-Vega, A. "Rate of Decay of a Passive Scalar in a Micro-Mixer and the Frequency of the Advecting Velocity Fields." Proceedings of the ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. Volume 3: Combustion, Fire and Reacting Flow; Heat Transfer in Multiphase Systems; Heat Transfer in Transport Phenomena in Manufacturing and Materials Processing; Heat and Mass Transfer in Biotechnology; Low Temperature Heat Transfer; Environmental Heat Transfer; Heat Transfer Education; Visualization of Heat Transfer. San Francisco, California, USA. July 19–23, 2009. pp. 527-535. ASME. https://doi.org/10.1115/HT2009-88626
Download citation file:
7
Views
Related Proceedings Papers
Related Articles
Heat Transfer Through a Pressure-Driven Three-Dimensional Boundary Layer
J. Heat Transfer (May,1991)
Numerical Modeling of Chaotic Mixing in Electroosmotically Stirred Continuous Flow Mixers
J. Heat Transfer (September,2009)
In Situ Detailed Chemistry Calculations in Combustor Flow Analyses
J. Eng. Gas Turbines Power (October,2001)
Related Chapters
Scope of Section I, Organization, and Service Limits
Power Boilers: A Guide to the Section I of the ASME Boiler and Pressure Vessel Code, Second Edition
Methodology for Proliferation Resistance for Advanced Nuclear Energy Systems (PSAM-0450)
Proceedings of the Eighth International Conference on Probabilistic Safety Assessment & Management (PSAM)
An On-Line Signature Verification Method Based on Multi-Dimensional Feature Matching
International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011)