Optical characterization method for birefringent fluids using a polarization camera

Lane, Connor; Rode, David; Rösgen, Thomas

doi:10.1016/j.optlaseng.2021.106724

Cited by 17 publications

(15 citation statements)

References 36 publications

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“…The increase in birefringence per shear rate decreases for higher shear rates as the slope decreases. A rather sharp increase at low shear rates and a levelling off at higher velocity gradients has been similarly found for Xanthan gum solutions (Chow and Fuller 1984;Lane et al 2021). Birefringence of Milling Yellow suspensions has been reported to be proportional to shear rate at low shear rates but also shows a levelling off at higher shear rates (Peebles et al 1964).…”

Section: Resultssupporting

confidence: 64%

“…Birefringence of Milling Yellow suspensions has been reported to be proportional to shear rate at low shear rates but also shows a levelling off at higher shear rates (Peebles et al 1964). The studied CNC suspensions display birefringence of magnitude 1e-5 and are hence in the same order as Xanthan gum (Lane et al 2021) and Milling Yellow (Peebles et al 1964). Hence CNC suspensions appear as an attractive alternative for ow visualization studies due to their stability, ease of preparation and low cost.…”

Section: Resultsmentioning

confidence: 79%

“…2. It is the same apparatus as documented in Lane et al (2021) with only small modi cations. Unpolarized light from a halogen bulb (1500W EKE) is emitted through a 600nm bandpass lter (600FS10-50 from Andover Corporation, HBW 10nm).…”

Section: Methodsmentioning

confidence: 99%

“…We use the measurement technique described in a previous study (Lane et al 2021) to characterize the birefringent uid. At each position \phi, the polarization camera records the intensities {I_0}(\phi ),{I_{45}} (\phi ),{I_{90}}(\phi ),{I_{135}}(\phi ).…”

Section: Optical Characterizationmentioning

confidence: 99%

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Birefringent Properties of Aqueous Cellulose Nanocrystal Suspensions

Lane

Rode

Rösgen

2022

Preprint

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Birefringence measurements of aqueous cellulose nanocrystal (CNC) suspensions are reported. Seven suspensions with concentrations between 0.7–1.3 percentage per weight are sheared in a Taylor-Couette type setting and characterized using a birefringent measurement technique based on linear polarized light and acquisition with a polarization camera. Steady state measurements with shear rates up to 31 1/s show extinction angles of 23–40° and birefringence in the order of 1e-5. The findings demonstrate the utility of CNC suspensions for flow birefringence studies.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 79%

Section: Methodsmentioning

confidence: 99%

Section: Optical Characterizationmentioning

confidence: 99%

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Birefringent Properties of Aqueous Cellulose Nanocrystal Suspensions

Lane

Rode

Rösgen

2022

Preprint

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“…2. It is the same apparatus as documented in Lane et al (2021) with only small modifications. Unpolarized light from a halogen bulb (150 W EKE) is emitted through a 600 nm bandpass filter (600FS10-50 from Andover Corporation, HBW 10 nm).…”

Section: Methodsmentioning

confidence: 99%

Birefringent properties of aqueous cellulose nanocrystal suspensions

2022

Self Cite

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Birefringence measurements of aqueous cellulose nanocrystal (CNC) suspensions are reported. Seven suspensions with concentrations between 0.7 and 1.3% per weight are sheared in a Taylor-Couette type setting and characterized using a birefringent measurement technique based on linear polarized light and acquisition with a polarization camera. Steady state measurements with shear rates up to 31 1/s show extinction angles of 23°–40° and birefringence in the order of 1e–5. The findings demonstrate the utility of CNC suspensions for flow birefringence studies.

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Two-dimensional strain rate imaging study using a polarization camera and birefringent aqueous cellulose nanocrystal suspensions

Lane,

Baumann,

Rode

et al. 2023

Exp Fluids

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The birefringence response of aqueous cellulose nanocrystal (CNC) suspensions in a two-dimensional laminar flow is measured and studied. The suspensions have CNC concentrations of 1.0 wt% (weight percentage) and 1.2 wt%. Cellulose nanocrystals are optically anisotropic rod-like particles that align when subjected to local velocity gradients, whereas at rest, they remain randomly orientated by Brownian motion. The alignment causes birefringence, a phenomenon also known as flow-induced birefringence. We study the flow through an additively manufactured flow channel and measure the amount of birefringence as well as the position of the refractive index axes by using polarizers and a polarization camera. With the help of reference data published in a previous study (Lane, Rode, et al., 2022a), strain rates are derived from the birefringence measurements and compared with numerical simulations. Two flow situations are studied, a plane Poiseuille flow and the flow around a cosine-shaped constriction. The experimentally derived shear rates for the plane Poiseuille flow are consistent with theoretical and computational results. The derived strain rates for the flow around the cosine-shaped constriction show an unexpected asymmetric profile, with the strain rates in the contraction zone being larger than in the expansion zone. The averaged orientation of the CNCs in the flow is linked to the position of the refractive index axes. In the contraction zone, the CNCs tend to align parallel to the flow, whereas in the expansion zone, the CNCs tend to align perpendicular to the flow. The results of this study are discussed in the context of previous, similar studies. The asymmetric strain rate profile around the cosine-shaped constriction is thought to originate from history effects, and the alignment of the CNCs is influenced by extensional rates.

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Optical characterization method for birefringent fluids using a polarization camera

Cited by 17 publications

References 36 publications

Birefringent Properties of Aqueous Cellulose Nanocrystal Suspensions

Birefringent Properties of Aqueous Cellulose Nanocrystal Suspensions

Birefringent properties of aqueous cellulose nanocrystal suspensions

Two-dimensional strain rate imaging study using a polarization camera and birefringent aqueous cellulose nanocrystal suspensions

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