Measurement of the flow behavior index of Newtonian and shear-thinning fluids via analysis of the flow velocity characteristics in a mini-channel

Ansari, Shadi; Rashid, Md. Ashker Ibney; Waghmare, Prashant R.; Nobes, David S.

doi:10.1007/s42452-020-03561-w

Cited by 45 publications

(21 citation statements)

References 40 publications

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“…Higher viscosity and proper control printing at 210 • C with bed temperature of 60 • C were optimized for high dimensional accuracy between the successive of voids between the layers in the 3D printings [5]. The power-law model as presented in Equation ( 2) is determined the flow behavior to identify 3D printing layer and dimensional stability [11,31], where τ is shear stress, . γ is shear rate, K is consistency index, and n is power-law index, which were estimated by the power regression.…”

Section: Rheological Propertiesmentioning

confidence: 99%

Rheological Behavior and Dynamic Mechanical Properties for Interpretation of Layer Adhesion in FDM 3D Printing

Thumsorn

Prasong²,

Kurose

et al. 2022

Polymers

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Commercial filaments of poly(lactic acid) (PLA) composites with particulate filler, carbon fiber, and copper powder with different contents were fabricated by FDM 3D printing in XZ-direction at bed temperatures of 45 °C and 60 °C. The effects of additives and bed temperatures on layer adhesion, fracture behavior, and mechanical performance of the PLA composites 3D printing were evaluated. Rheological properties informed viscous nature of all filaments and interface bonding in the PLA composites, which improved printability and dimensional stability of the 3D printing. Crystallinity of the PLA composites 3D printing increased with increasing bed temperature resulting in an improvement of storage modulus, tensile, and flexural properties. On the contrary, the ductility of the 3D printing was raised when printed at low bed temperature. Dynamic mechanical properties, the degree of entanglement, the adhesion factor, the effectiveness coefficient, the reinforcing efficiency factor, and the Cole–Cole analysis were used to understand the layer adhesion, and the interfacial interaction of the composites as compared to the compression molded sheets. SEM images revealed good adhesion between the additives and the PLA matrix. However, the additives induced faster solidification and showed larger voids in the 3D printing, which indicated lower layer adhesion as compared to neat PLA. It can be noted that the combination of the additives and the optimized 3D printing conditions would be obtain superior mechanical performance even layer adhesion has been restricted.

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Section: Rheological Propertiesmentioning

confidence: 99%

Rheological Behavior and Dynamic Mechanical Properties for Interpretation of Layer Adhesion in FDM 3D Printing

Thumsorn

Prasong²,

Kurose

et al. 2022

Polymers

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“…During 2 ml/min~4 ml/min, the Psd of CMC solution has the same trend as the Psd of water. When the shear-thinning fluid has a high shear rate, the fluid will enter a high-shear-rate viscosity plateau [22]. When the inlet flow rate is greater than 2 ml/min, the calculated fluid shear rate (8vL/d) reaches 8000~9000s -1 [23], consistent with the shear rate in the stable viscosity zone measured by the rheometer.…”

Section: Pressure Drop Of Single-phase Flowmentioning

confidence: 60%

Influence of Non-newtonian Properties of Liquid in Microchannels on Pressure Drop and Bubble Length

Yang

Feng

et al. 2021

Preprint

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Pressure drop and bubble morphology are essential characteristics of microfluidic system design and process control. In this paper, a new type of microfluidic chip was designed and produced, including a flow-focusing device and a fluid transport device to simulate bubble generation and fluid transport in practical applications. Nitrogen and sodium carboxymethyl cellulose solutions of different concentrations were used as the gas and liquid phases. Single-phase flow and two-phase flow experiments were designed according to the commonly used flow conditions in the microchannel. By changing the flow rates of liquid and gas, the pressure drop in the fluid transport device of the two fluid states, the length of the bubble generated in the flow-focusing device, and the length of the bubble after passing through the transport device were measured, respectively. The influence of non-Newtonian characteristics of the liquid on pressure drop and the length of the generated bubbles were analyzed. The results show that the non-Newtonian characteristics of fluid have a significant effect on the pressure drop of single-phase flow and two-phase flow. Within a specific flow velocity range, the bubble length can be predicted according to the dimensionless number of the liquid. The pressure drop increases the bubble length to varying degrees.

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“…When n reaches values beyond unity, the material is starts thinning upon the applied shearing force and when it exceeds the value of unity, the material starts shear thickening and reacts to the viscosity increase. In the first case, the lower the n value, the higher the deviation from Newtonian flow [ 48 ]. The K parameter, in turn, is described as the consistency coefficient and is equal to the shear stress at a shear rate of 1.0 s −1 .…”

Section: Resultsmentioning

confidence: 99%

Towards the Preparation of a Hydrogel from Lyophilisates of the Aloe arborescens Aqueous Extract

Pawłowicz

Paczkowska-Walendowska

Osmałek

et al. 2022

Pharmaceutics

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Aloe gel is a medicinal raw material with proven pharmacological activity. The health-promoting properties of other species of Aloe upon topical application prompted us to develop a formulation for the topical application of A. arborescence species. As a result of the gel preparation from the aqueous lyophilized extracts of three-year-old leaves of A. arborescence, no changes in the composition of the content of aloins A and aloenin A were found. The potential to neutralize free radicals was tested using DPPH and CUPRAC techniques, which confirmed the anti-radical activity of the lyophilisate. Screening of the inhibition of enzymes, the hyperactivity of which is associated with adverse changes in the skin of a pro-inflammatory nature, was performed. Importantly, using the PAMPA SKIN model, the possibility of the penetration of selected extract compounds (aloin A and aloenin A) through the skin was proven. Then, two formulations were prepared based on sodium alginate and hydroxypropyl methylcellulose (HPMC) and the hydrogels were characterized (rheological analysis, drug release profiles, permeability, and stability studies). HPMC-based hydrogel was the one with a targeted release of active substances and greater stability. Aloe arborescens hydrogel matrices seem to be a promising treatment strategy for inflammatory surface damage based on “green technology” at the stage of extract preparation and development of the drug form for topical application.

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Measurement of the flow behavior index of Newtonian and shear-thinning fluids via analysis of the flow velocity characteristics in a mini-channel

Cited by 45 publications

References 40 publications

Rheological Behavior and Dynamic Mechanical Properties for Interpretation of Layer Adhesion in FDM 3D Printing

Rheological Behavior and Dynamic Mechanical Properties for Interpretation of Layer Adhesion in FDM 3D Printing

Influence of Non-newtonian Properties of Liquid in Microchannels on Pressure Drop and Bubble Length

Towards the Preparation of a Hydrogel from Lyophilisates of the Aloe arborescens Aqueous Extract

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