A 3D electrokinetic flow structure of solution displacement in microchannels for on-chip sample preparation applications
Bibliographic record
Abstract
Electroosmotic flow with solution displacement in microchannels is often encountered in many lab-on-a-chip devices where washing procedures are designed using one solution to displace another different solution. In order to investigate the detailed flow structures for a displacement process between two different electrolyte solutions, a three-dimensional numerical model is developed in this paper. KCl solution and LaCl3 solution are used as sample solutions. A 2 mm long straight microchannel with a rectangular cross-sectional area (height 100 µm and width 200 µm) was employed in this study. The governing equations of the applied electrical field, flow field and concentration field are numerically solved based on a finite-control-volume scheme. The fluid flow coupled equations are solved using the semi-implicit method for pressure-linked equation (SIMPLE) algorithm. The observed electrokinetic flow structures include back flow in the center of the channel and distortion of the plug-like electroosmotic velocity profile, which are investigated in detail. It is found that distortion in the flow field is due to the induced pressure gradient, which results from the nonuniformity of electroosmotic mobilities and electrical conductivities of the two solutions. Finally, the displacement between a pair of different solutions, distilled ultra-filtered (DIUF) water and LaCl3 solution, is briefly studied.
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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".