Birefringent Properties of Aqueous Cellulose Nanocrystal Suspensions

Lane, Connor; Rode, David; Rösgen, Thomas

doi:10.21203/rs.3.rs-1382651/v1

Cited by 1 publication

(1 citation statement)

References 15 publications

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“…1. In recent years, there have been some reports on the application of photoelasticity to quasi-two-dimensional fluid flows [15][16][17][18][19]. In particular, several measurements have used an aqueous cellulose nanocrystal suspension (hereinafter, CNC suspension) as the photoelastic fluid [15,[20][21][22] to show that the above two-dimensional measurement principle can be successfully applied [23,24]. These studies have shown the great potential of photoelasticity for flow field measurements.…”

Section: Introductionmentioning

confidence: 99%

Integrated photoelasticity measurements of a three-dimensional laminar flow: second-order stress terms in the stress-optic law

Nakamine¹,

Yokoyama²,

Worby³

et al. 2023

Preprint

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This study experimentally validates a stress-optic law for a three-dimensional flow using integrated photoelasticity. In this stress-optic law, the stress is related to the two photoelastic parameters — the phase retardation Δ and orientation 𝜙 — of elliptically-polarized light. Previous studies have examined the stress-optic law of three-dimensional flows, but the importance of the second-order stress terms in the three-dimensional stress-optic law, i.e., those relating to the stress component along the camera’s optical axis, have not yet been experimentally validated. In this work, we measure the retardation of a steady Newtonian fluid laminar flow (cellulose nanocrystal suspension of 0.5 wt%) in a square channel and compare it with the theoretical prediction. Remarkably, the theoretical result including the second-order stress terms shows good agreement with the experimental result for various flow rates, while the calculation without these terms results in a significant deviation from the measurements. Therefore, proper consideration of the second-order stress terms in the three-dimensional stress-optic law is crucial for integrated photoelasticity measurements of three-dimensional flow fields.

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