Highly turbulent Taylor-Couette turbulence

Gils, Dennis van

doi:10.3990/1.9789036532723

DOI: 10.3990/1.9789036532723

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Highly turbulent Taylor-Couette turbulence

Dennis van Gils¹

Abstract: Nederlandse titel: Hoog Turbulente Taylor-Couette StromingCover: High-speed imaging snapshot showing fully developed turbulent structures inside the T 3 C gap, seeded with reflective flakes and illuminated by a laser sheet. On the left is the inner cylinder wall, on the right the outer cylinder wall.Publisher:

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Cited by 2 publications

References 141 publications

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Introducing a Rheology Model for Non-Newtonian Drilling Fluids

et al. 2021

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An API standard drilling fluid was investigated from laminar to turbulent flow conditions using an in-house-built viscometer at speeds from 200 to 1600 RPM. A power-based method was applied to obtain the apparent viscosity and the shear stress of the water-based drilling mud (WBM) in the annulus of the viscometer. Then, a MATLAB optimization program was developed to obtain model parameters for five rheology models integrated in a generalized Herschel-Bulkley-Extended (HBE) model and two widely used 4-parameter models in drilling industry. It is found that the Bingham, Cross, and HBE rheology models have precisely matched the WBM measurements in the viscometer. A generalized Reynolds number was applied to determine the Darcy friction factor although the PL (power law model) and the HB (Herschel-Bulkley model) exhibited a nonrealistic negative shift from the laminar friction factor.

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Introducing a Rheology Model for Non-Newtonian Drilling Fluids

et al. 2021

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Use of SiO2 Nanoparticles in Water-Based Drilling Fluids for Improved Energy Consumption and Rheology: A Laboratory Study

et al. 2021

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Summary In wellbore drilling, it is appreciable to devise methods to study the rheology of high-speed annulus fluid flows. In this paper, a high-speedTaylor-Couette system (TCS) was devised to explore non-Newtonian fluid flow behavior appraised by SiO2 nanoparticles toward friction reduction, power saving, and rheology modeling of nanofluids. Water-based mud (WBM) as an environmentally friendly drilling fluid is investigated by adding SiO2 nanoparticles at four low-volume concentrations of 0.05, 0.1, 0.5, and 1% at speeds from 0 to 1,600 rev/min with 200 rev/min intervals in the TCS. Five rheology models based on the Herschel-Bulkley-Extended (HBE) model and a generalized Reynolds number were optimized to fit with the experimental data. All models except the Newtonian model have fitted all nanofluids with high accuracy, especially Bingham and HBE models. Negative deviation from Darcy friction was avoided for power-law (PL) and Herschel-Bulkley (HB) models using the modification to the generalized Reynolds number. Higher energy saving and enhanced rheology is reported particularly at lower volume concentrations of SiO2 WBM nanofluids. The Darcy friction factor deviated from laminar flow at the generalized Reynolds number beyond 2,000 into turbulent, which is a good indicator for the flow condition of complex non-Newtonian nanofluids in real-lifeapplication.

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Highly turbulent Taylor-Couette turbulence

Cited by 2 publications

References 141 publications

Introducing a Rheology Model for Non-Newtonian Drilling Fluids

Introducing a Rheology Model for Non-Newtonian Drilling Fluids

Use of SiO2 Nanoparticles in Water-Based Drilling Fluids for Improved Energy Consumption and Rheology: A Laboratory Study

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