Three-Dimensional Structure of Electroosmotic Flow over Heterogeneous Surfaces
Bibliographic record
Abstract
Electroosmotic flow is widely used as a primary method of species transport in microscale biological and chemical analysis systems commonly referred to as labs-on-a-chip. In these systems, surface electrokinetic heterogeneity can be introduced either intentionally through micromanufacturing technology, such as microcontact printing, or unintentionally through, for example, bioparticle adhesion. In either case it is desirable to examine the influence of these surface heterogeneities on the electroosmotic flow structure. In this paper a numerical model based on a simultaneous solution to the Nernst−Planck, Poisson, and Navier−Stokes equations is used to examine the electroosmotically driven flow through a microchannel exhibiting a periodically repeating patchwise heterogeneous surface pattern. The simulations have revealed a distinct three-dimensional flow structure that, depending on the degree of heterogeneity, varies from a weak circulation perpendicular to the applied electric field to a fully circulatory flow system. In general the induced flow structure is found to penetrate into the bulk flow no deeper than the length scale of the heterogeneous patches. In addition the electrophoritic influence of the applied electric field on the net charge density in the double layer is shown to cause a significant deviation from the traditional Poisson−Boltzmann distribution. The overall effect of this double-layer rearrangement on the flow structure, however, is found to be negligible.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".