Pressure-Driven Suspension Flow near Jamming
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Bibliographic record
Abstract
We report here magnetic resonance imaging measurements performed on suspensions with a bulk solid volume fraction (${\ensuremath{\phi}}_{0}$) up to 0.55 flowing in a pipe. We visualize and quantify spatial distributions of $\ensuremath{\phi}$ and velocity across the pipe at different axial positions. For dense suspensions (${\ensuremath{\phi}}_{0}>0.5$), we found a different behavior compared to the known cases of lower ${\ensuremath{\phi}}_{0}$. Our experimental results demonstrate compaction within the jammed region (characterized by a zero macroscopic shear rate) from the jamming limit ${\ensuremath{\phi}}_{m}\ensuremath{\approx}0.58$ at its outer boundary to the random close packing limit ${\ensuremath{\phi}}_{\text{rcp}}\ensuremath{\approx}0.64$ at the center. Additionally, we show that $\ensuremath{\phi}$ and velocity profiles can be fairly well captured by a frictional rheology accounting for both further compaction of jammed regions as well as normal stress differences.
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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 | 0.001 |
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 it