Time-resolved sedimentation of dense potato-starch suspensions measured by optical coherence tomography

[2608.15067] Time-resolved sedimentation of dense potato-starch suspensions measured by optical coherence tomography Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Condensed Matter > Soft Condensed Matter arXiv:2608.15067 (cond-mat) [Submitted on 15 Aug 2026] Title: Time-resolved sedimentation of dense potato-starch suspensions measured by optical coherence tomography Authors: T. Saiki , H. Katsuragi View a PDF of the paper titled Time-resolved sedimentation of dense potato-starch suspensions measured by optical coherence tomography, by T. Saiki and 1 other authors View PDF HTML (experimental) Abstract: We demonstrate optical coherence tomography (OCT) as a measurement technique for dense, optically opaque suspensions. Conventional optical methods cannot access the interior of such suspensions. OCT resolves individual potato-starch particles (${\sim}20~\mathrm{\mu m}$) as distinct scatterers, even though the suspension appears opaque to the eye. By tracking the vertical centroid position of the particle-laden layer $\langle Z \rangle(t)$ and the supernatant boundary $Z_\mathrm{sup}(t)$ in the same OCT image sequence, we obtain the instantaneous settling velocity $V(t)$ and the time-evolving effective volume fraction $\phi_\mathrm{eff}(t)$ simultaneously and continuously in time. To our knowledge, this is the first measurement to combine settling velocity and particle concentration into a single continuous trajectory within one sedimentation run. Conventional batch measurements yield only one velocity value per run. We applied this method to dense potato-starch suspensions, varying the initial volume fraction $\phi_0$ from 0.30 to 0.50 and the solvent density $\rho_\mathrm{L}$ from 1.0 to $1.3{\times}10^3~\mathrm{kg~m^{-3}}$ using aqueous sodium polytungstate solutions. The normalized velocity $V/V_\mathrm{Stokes}$ plotted against $\phi_\mathrm{eff}$ collapses onto a common trend consistent with both the Krieger--Dougherty model and the Richardson--Zaki law over $\phi_\mathrm{eff} \simeq 0.30$--$0.52$, confirming that the method captures physically reasonable hindered-settling behavior. These results establish OCT as a viable tool for probing internal dynamics in dense suspensions that were previously inaccessible to optical measurement. Comments: 8 pages, 5 figures Subjects: Soft Condensed Matter (cond-mat.soft) ; Fluid Dynamics (physics.flu-dyn) Cite as: arXiv:2608.15067 [cond-mat.soft] (or arXiv:2608.15067v1 [cond-mat.soft] for this version) https://doi.org/10.48550/arXiv.2608.15067 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Hiroaki Katsuragi [ view email ] [v1] Sat, 15 Aug 2026 06:36:38 UTC (2,283 KB) Full-text links: Access Paper: View a PDF of the paper titled Time-resolved sedimentation of dense potato-starch suspensions measured by optical coherence tomography, by T. Saiki and 1 other authors View PDF HTML (experimental) TeX Source view license Current browse context: cond-mat.soft < prev | next > new | recent | 2026-08 Change to browse by: cond-mat physics physics.flu-dyn References & Citations NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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