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Colloid and Polymer Science

, Volume 284, Issue 11, pp 1275–1286

First Online: 19 May 2006Received: 10 November 2005Accepted: 11 February 2006

Abstract

Experiments were performed using a microparticle image velocimetry MPIV for 2D velocity distributions of electroosmotically driven flows in a 40-mm-long microchannel with a square cross section of 200×200 μm. Electroosmotic flow EOF bulk fluid velocity measurements were made in a range of streamwise electric field strengths from 5 to 25 kV-m. A series of seed particle calibration tests can be made in a 200×120×24,000-μm untreated polydimethyl siloxane PDMS channel incorporating MPIV to determine the electrophoretic mobilities in aqueous buffer solutions of 1× TAE, 1× TBE, 10 mM NaCl, and 10 mM borate. A linear-nonlinear due to Joule heating flow rate increase with applied field was obtained and compared with those of previous studies. A parametric study, with extensive measurements, was performed with different electric field strength and buffer solution concentration under a constant zeta potential at wall for each buffer. The characteristics of EOF in square microchannels were thus investigated. Finally, a composite correlation of the relevant parameters was developed in the form of \u* = 5.46\;\varsigma {\kern 1pt} ^{{*0.739}} DN^{{ - 2.132}} ME^{{*0.9996}} {x}\ within ±1% accuracy for 99% of the experimental data.

KeywordsElectroosmotic flow MPIV measurements A square channel  Download fulltext PDF



Author: Shou-Shing Hsieh - Hung-Chun Lin - Chih-Yi Lin

Source: https://link.springer.com/







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