Predicting the friction factor in straight pipes in the case of Bingham plastic and the power-law fluids by means of measurements and CFD simulation

Csizmadia, Péter; Hős, Csaba

doi:10.3311/ppch.2174

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…The difference between our calculated friction factors and the f BR was below 3 % by the B fluids; and was not more that 15 % by HB model. The calculated friction factors as the function of the traditionally defined Re showed good accordance with the literature; the outlined pattern (the markers are around lines) of the laminar friction factor were separated by the He-number (see Fig 5.) [22][23][24]. In case of PL fluid (when He is zero) the calculated friction factor values were on the 64 / Re line.…”

Section: Friction Factormentioning

confidence: 99%

The Effect of Rheology Model of an Activated Sludge on to the Predicted Losses by an Elbow

Csizmadia

Till

2018

Period. Polytech. Mech. Eng.

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This study presents a numerical investigation of flow and rheological behaviour of activated sludge. These materials are usually driven by pumps in wastewater treatment plants. Because of the correct sizing of the pipeline systems, which is of great importance from the point of view of efficiency, the friction losses and loss coefficients of the components have to be known. These are well-known in the case of Newtonian fluids but few data are available if the rheological properties are non-Newtonian. Three non-Newtonian models (Ostwald, Bingham, Herschel-Bulkley) are investigated related to the friction factor of a straight pipe, the loss coefficients of an elbow and to the pressure drop on this element. For our study the rheological data were used from the literature, where the same sample origin was diluted or concentrated to achieve three different TSS (total suspended solids) contents for the same sludge (7.4 g/l; 6.2 g/l; 3.6 g/l). Moreover, modified Reynolds-number definitions are tested related to the non-Newtonian models in the case of the laminar, transition and turbulent regions.

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Section: Friction Factormentioning

confidence: 99%

The Effect of Rheology Model of an Activated Sludge on to the Predicted Losses by an Elbow

Csizmadia

Till

2018

Period. Polytech. Mech. Eng.

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“…The coefficient of friction evaluated from correlations for both helical and spiral coils show a good agreement for both laminar and turbulent flow. [12][13][14] studied frictional losses by Computational Fluid Dynamics in straight pipes for Power-law fluids. The authors 14 used water as a Newtonian fluid and checked the accuracy of the CFD technique.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14] studied frictional losses by Computational Fluid Dynamics in straight pipes for Power-law fluids. The authors 14 used water as a Newtonian fluid and checked the accuracy of the CFD technique. After that Carbopol 971 solution was used as a non-Newtonian fluid.…”

Section: Introductionmentioning

confidence: 99%

Determination of friction factor and heat transfer rate in laminar flow in an agitated vessel

Kumar²,

Sharma

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Helical coils are commonly employed in a variety of process industries due to their superior fluid mixing capabilities, the flexibility of fabrication, and simple design. Frictional pressure losses occur in flow-through helically coiled tubes, affecting the heat transfer rate across the coils. An inquiry is carried out in the current experimental study to discover friction factors and heat transfer rates within the coil tubes of test fluids flowing in the laminar flow area. Non-Newtonian test fluids comprised ichorous solutions of Carboxy Methyl Cellulose (CMC) at concentrations of 0.5 percent, 1 percent, and 2 percent, whereas Newtonian test fluids consisted of water. With the use of an appropriate viscosity expression, Newtonian consonances are demonstrated to apply to several non-Newtonian fluids with certain constraints. In a laminar flow, the shear stress in a helical coil is greater than in a straight conduit. It has been proved that the experimental data can be fruitfully correlated across a broad extent of fluid data and coil radius stretch. The investigated data obtained has been correlated with Standard a deviation of 15.6% with the range 25<D_e < 2000 and 40<P_r < 226.

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An optimization-based design approach for a novel self-adjuster using shear thickening fluid

Nagy-György

Bene

Hős

2021

Struct Multidisc Optim

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Recently, the increasingly strict safety and emission regulations in the automotive industry drove the interest towards automatic length compensating devices, e.g., hydraulic lash adjusters (lower emission) and slack adjuster in brake systems (faster brake response). These devices have two crucial requirements: (a) be stiff during high load, while (b) be flexible in the released state to compensate for environmental effects such as wear and temperature difference. This study aims to use the advantageous properties of shear thickening fluids to develop a less complicated, cost-efficient design. The proposed design is modeled by a system of ordinary differential equations in which the effect of the non-Newtonian fluid flow is taken into account with a novel, simplified, semi-analytical flow rate-pressure drop relationship suitable for handling arbitrary rheology. The adjuster’s dimensions are determined with a multi-objective genetic algorithm based on the coupled solid-fluid mechanical model for six different shear thickening rheologies. The accuracy of the simplified flow model is verified by means of steady-state and transient CFD simulations for the optimal candidates. We have found that the dominating parameters of such devices are (a) the shear thickening region of the fluid rheology and (b) the gap sizes, while the piston diameters and the zero viscosity or the critical shear rate of the fluid have less effect. Based on the results, we give guidelines to design similar-length compensating devices.

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Predicting the friction factor in straight pipes in the case of Bingham plastic and the power-law fluids by means of measurements and CFD simulation

Abstract: Abstract

Cited by 7 publications

References 15 publications

The Effect of Rheology Model of an Activated Sludge on to the Predicted Losses by an Elbow

The Effect of Rheology Model of an Activated Sludge on to the Predicted Losses by an Elbow

Determination of friction factor and heat transfer rate in laminar flow in an agitated vessel

An optimization-based design approach for a novel self-adjuster using shear thickening fluid

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