Obtaining flow curve for viscoplastic fluids through inclined open-channel apparatus

Sáo, Yuri Taglieri; Pereira, Jonny Everson Scherwinski; Fiorot, Guilherme Henrique; Maciel, Geraldo de Freitas

doi:10.1007/s40430-021-02999-2

Cited by 4 publications

(1 citation statement)

References 41 publications

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“…Based on these assumptions, the viscosity of the binder at a specific temperature can be calculated by squeezing it through a nozzle with a cross-section much larger than its diameter and using the volumetric flow rate and the Hagen-Poiseuille equation. [24] The formula for calculating the volume flow rate (Q ) in m 3 s À1 is as follows:…”

Section: Binder Viscosity Calculationmentioning

confidence: 99%

Optimal Process Parameters for FDM‐Based 3D Printing of Metal‐Polymer Mixtures with Low‐Temperature Powder Feeding

Xue,

Chao,

Han

et al. 2024

steel research int.

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In this study, a proprietary powder‐fed 3D printer is employed to fabricate impellers from metal‐polymer mixtures via low‐temperature extrusion, simplifying the traditional complex metal molding process. By adjusting the extrusion speed and temperature, various quality impeller blanks are produced, identifying optimal printing conditions. The best results are achieved with a feed temperature of 170 °C, extrusion speed of 6 r min−1, printing platform temperature of 50 °C, and nozzle temperature of 175 °C, achieving a surface roughness of Ra = 9.973 μm. Post‐processing densification of the stainless steel wheels reach 97.23%, with a tensile strength of 255 MPa, elongation at break of 49%, and hardness of 60 HRB. These parameters meet the physical and mechanical standards required for general metal parts, demonstrating potential for precision metal processing in sectors such as aircraft engines, gas turbines, and high‐performance pumps.

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Section: Binder Viscosity Calculationmentioning

confidence: 99%

Optimal Process Parameters for FDM‐Based 3D Printing of Metal‐Polymer Mixtures with Low‐Temperature Powder Feeding

Xue,

Chao,

Han

et al. 2024

steel research int.

View full text Add to dashboard Cite

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Non-Newtonian ViRheometry via Similarity Analysis

Hamamichi,

Nagasawa,

Okada

et al. 2023

ACM Trans. Graph.

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We estimate the three Herschel-Bulkley parameters (yield stress σ Y , power-law index n , and consistency parameter η ) for shear-dependent fluid-like materials possibly with large-scale inclusions, for which rheometers may fail to provide a useful measurement. We perform experiments using the unknown material for dam-break (or column collapse) setups and capture video footage. We then use simulations to optimize for the material parameters. For better match up with the simple shear flow encountered in a rheometer, we modify the flow rule for the elasto-viscoplastic Herschel-Bulkley model. Analyzing the loss landscape for optimization, we realize a similarity relation ; material parameters far away within this relation would result in matched simulations, making it hard to distinguish the parameters. We found that by exploiting the setup dependency of the similarity relation, we can improve on the estimation using multiple setups, which we propose by analyzing the Hessian of the similarity relation. We validate the efficacy of our method by comparing the estimations to the measurements from a rheometer (for materials without large-scale inclusions) and show applications to materials with large-scale inclusions, including various salad or pasta sauces, and congee.

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Evaluation of shear rate formulations through steady uniform non-Newtonian fluid flows in the context of shallow-water equations

Sáo

Pereira

Maciel

2023

RBRH

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Non-Newtonian rheology effects, such as pseudoplasticity and viscoplasticity, are understood as shear stresses, incorporated to the energy slope term in the Shallow-Water Equations (SWE). However, non-Newtonian shear stresses are dependent of the shear rate, whose formulation is a function of the gradient of the velocity profile in the bottom. This study investigated two shear rate formulations that are commonly applied in the SWE literature: 1) a non-parameterized function; and 2) a function based on the Herschel-Bulkley rheological model. Their influence in steady uniform flows of non-Newtonian fluids was evaluated through numerical-theoretical comparisons. A Lax-Friedrichs scheme was implemented to solve the SWE system and allowed employing the shear rate formulations. Experimental tests were carried out and numerical simulations of hypothetical scenarios were performed. It was found that the non-parameterized formulation presented deviation in normal depth up to 14% in comparison with theoretical solution, while the formulation based on the Herschel-Bulkley model provided a good agreement, corroborated by punctual Computational Fluid Dynamics simulations (deviation less than 2%) and experimental data. The ratio of both shear rate formulations is strongly correlated to the deviation of normal depth, indicating that the non-parameterized shear rate function does not provide an acceptable result in the steady uniform flow.

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Obtaining flow curve for viscoplastic fluids through inclined open-channel apparatus

Cited by 4 publications

References 41 publications

Optimal Process Parameters for FDM‐Based 3D Printing of Metal‐Polymer Mixtures with Low‐Temperature Powder Feeding

Optimal Process Parameters for FDM‐Based 3D Printing of Metal‐Polymer Mixtures with Low‐Temperature Powder Feeding

Non-Newtonian ViRheometry via Similarity Analysis

Evaluation of shear rate formulations through steady uniform non-Newtonian fluid flows in the context of shallow-water equations

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