Microchannel Flow with Patchwise and Periodic Surface Heterogeneity
Bibliographic record
Abstract
Surface heterogeneity is present in a variety of electrokinetic transport phenomena. It is desirable to understand the synergetic effects of the electrical double layer field and the surface heterogeneity on electrokinetic flow in microchannels. In this paper, a 3D, finite element based, numerical model for pressure-driven flow through microchannels with an arbitrary but periodic patchwise heterogeneous surface pattern has been developed. The model is based on a simultaneous solution to the Nernst−Planck, Poisson, and Navier−Stokes equations to determine the local ionic concentration, the double layer distribution, and the flow field. The presence of a heterogeneous patch is shown to induce flow in all three coordinate directions, including a circulation pattern perpendicular to the main flow axis. The strength of this circulation region is found to be proportional to Reynolds number and double layer thickness. While at low Reynolds number (i.e., Re < 1) the double layer distribution is diffusion dominated, significant convective effects are observed at higher Reynolds number leading to a deviation from the classical Poisson−Boltzmann distribution. The combined effect of the 3D flow field and disturbed double layer region on measurable quantities such as the streaming potential is discussed.
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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".