Secondary Dean flow characteristics of inelastic Bird-Carreau fluids in curved microchannels

Yoon, Kyu; Jung, Hyun Wook; Chun, Myung Suk

doi:10.1007/s13367-020-0007-4

Cited by 13 publications

(9 citation statements)

References 44 publications

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“…In Bird‐Carreau model, n value and λ value represent the slope and the transition point between two Newtonian plateaus of η 0 value and infinite viscosity, respectively (Yoon et al, 2020). When the shear rate is at low level (

\dot{γ} ≪ 1 / λ

), the Bird‐Carreau fluid behaves as a Newtonian fluid.…”

Section: Resultsmentioning

confidence: 99%

“…Different moisture content in starch materials attributes to the differences in the rheological characteristics (Fonseca‐Florido et al, 2018; Yeh et al, 2009). Yoon et al (2020) studied the influences of the rheological characteristics of the Bird‐Carreau model on the Dean flow, including viscosity ratio, relaxation time and power‐law index. Therefore, it is of great significance to clarify the influence of rheological parameters of starch Bird‐Carreau fluid on the flow field during twin‐screw extrusion.…”

Section: Introductionmentioning

confidence: 99%

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Clarifying the effect of rheological parameters of starch fluid on tensile properties of final extrudate in twin‐screw extrusion by numerical simulation

Liu

et al. 2022

J Food Process Engineering

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The distribution of the flow field, the input energy of the twin‐screw, and the dissipated energy on the fluid during the twin‐screw extrusion process were calculated by the POLYFLOW software to establish the relationship between the rheological parameters of starch fluid and tensile properties of the final extrudate. The results demonstrated that the pressure difference, the input energy of the twin‐screw, and the dissipated energy on the fluid were directly proportional to the zero‐shear viscosity (η0), reduced with the raise of the relaxation time constant (λ) and raised with the raise of the power‐law index (n). When the moisture content of starch fluid raised, the η0 value reduced, whereas the λ value and n value increased. The pressure difference, the input energy of the twin‐screw, and the dissipated energy on the fluid decreased, reducing the maximum tensile force of the final extrudate. Through numerical simulation and experimental verification, it was found that the changes of η0 value, λ value, and n value restricted each other on the tensile properties of final extrudate. Based on the numerical simulation, the tensile properties of the final extrudate could be predicted through rheological parameters of starch fluid. Practical Applications A method was established to predict the final extrudate properties based on rheological parameters and numerical simulation in this study. Based on the numerical simulation, the tensile properties of the final extrudate could be predicted through rheological parameters of starch fluid. This research will provide insight into the mechanism of twin‐screw extrusion of starch‐based materials.

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\dot{γ} ≪ 1 / λ

), the Bird‐Carreau fluid behaves as a Newtonian fluid.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clarifying the effect of rheological parameters of starch fluid on tensile properties of final extrudate in twin‐screw extrusion by numerical simulation

Liu

et al. 2022

J Food Process Engineering

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“…The mean Re numbers for the MPA, RPA and LPA and the Wo and De numbers of the healthy subjects were calculated and are reported in Table 5, together with the respective mean values for the adult rTOF patients. These parameters are associated with alterations in the wall shear stress [36,37] and secondary flow patterns [38][39][40][41]. A mean Re mean of 1006 was calculated for the MPA, which dropped to 737 and 705 for the RPA and LPA, respectively.…”

Section: Dimensionless Numbersmentioning

confidence: 99%

Computational Analysis of Blood Flow in Healthy Pulmonary Arteries in Comparison to Repaired Tetralogy of Fallot Results: A Small Cohort Study

Boumpouli,

Black,

Kazakidi

2024

Fluids

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Characterization of the physiological hemodynamic environment in normal pulmonary arteries is a key factor in understanding pathological conditions. This study aimed to analyze the morphology and hemodynamics in the healthy adult pulmonary bifurcation in comparison to age-matched repaired Tetralogy of Fallot (rTOF) geometries. The pulmonary trunk of five healthy volunteers was reconstructed from 4D Flow-MRI data and was compared to rTOF results. Subject-specific boundary conditions were assigned in both the inlet and outlets of the models, and flow characteristics were analyzed computationally. The morphological and flow features were consistent among the healthy geometries, highlighting the ability of an averaged geometry derived from this small cohort to capture the main flow characteristics. A slightly higher mean time-averaged wall shear stress (TAWSS) was found in the right pulmonary artery, which was also the branch with a higher mean curvature and local Reynolds number. Compared to rTOF results, the averaged healthy geometry demonstrated more than an 8-fold lower value in TAWSS, with the individual patient-specific healthy volunteers showing further reduced TAWSS than the rTOF patients. These observations could be useful in clinical assessment and decision making based on hemodynamic indices.

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“…Utilizing this estimation, we designed high throughput particle washing devices, where the target microparticles were transferred from source water into a clean buffer with high efficiencies (490%). 20,49 Ducloue ´et al, 50 Yoon et al 51,52 and others [53][54][55][56] numerically investigated the effect of De number and fluid viscosity on the secondary vortices of shear-thinning fluids in curved microchannels. We experimentally studied the effects of channel geometry and fluid properties on the Dean velocity of shearthinning PEO in water solutions 57 and shear-thickening SiO 2 nanofluids 58 in curvilinear microchannels.…”

Section: Theorymentioning

confidence: 99%

“…Ducloué et al , 50 Yoon et al 51,52 and others 53–56 numerically investigated the effect of De number and fluid viscosity on the secondary vortices of shear-thinning fluids in curved microchannels. We experimentally studied the effects of channel geometry and fluid properties on the Dean velocity of shear-thinning PEO in water solutions 57 and shear-thickening SiO 2 nanofluids 58 in curvilinear microchannels.…”

Section: Theorymentioning

confidence: 99%

Microparticle manipulation in viscoelastic flows inside curvilinear microchannels: a thorough fundamental study with application to simultaneous particle sorting and washing

Nikdoost

Rezai

2023

New J. Chem.

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Secondary Dean flow characteristics of inelastic Bird-Carreau fluids in curved microchannels

Cited by 13 publications

References 44 publications

Clarifying the effect of rheological parameters of starch fluid on tensile properties of final extrudate in twin‐screw extrusion by numerical simulation

Clarifying the effect of rheological parameters of starch fluid on tensile properties of final extrudate in twin‐screw extrusion by numerical simulation

Computational Analysis of Blood Flow in Healthy Pulmonary Arteries in Comparison to Repaired Tetralogy of Fallot Results: A Small Cohort Study

Microparticle manipulation in viscoelastic flows inside curvilinear microchannels: a thorough fundamental study with application to simultaneous particle sorting and washing

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