Influence of three-dimensional wall roughness on the laminar flow in microtube

Wang, Haoli; Yuan, Wang

doi:10.1016/j.ijheatfluidflow.2006.08.005

Cited by 20 publications

(9 citation statements)

References 21 publications

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“…The velocity profile is highly affected by the surface roughness, which increases the pressure drop. This has been looked into in ref [ 30 , 63 , 64 ], where it was discovered that roughness affects the velocity distribution of laminar Newtonian fluid flow in microchannels, resulting in a significant pressure drop throughout the channel length.…”

Section: Laminar Flow Of a Non-newtonian Fluid Through A Rough-walled...mentioning

confidence: 99%

Fractal Analysis of a Non-Newtonian Fluid Flow in a Rough-Walled Pipe

et al. 2022

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The fully developed laminar flow of a viscous non-Newtonian fluid in a rough-walled pipe is considered. The fluid rheology is described by the power–law model (covering shear thinning, Newtonian, and shear thickening fluids). The rough surface of the pipe is considered to be fractal, and the surface roughness is measured using surface fractal dimensions. The main focus of this study lies in the theoretical investigation of the influence of the pipe surface roughness on the velocity profile and the Darcy friction factor of an incompressible non-Newtonian fluid. The plotted results demonstrate that shear thinning fluids are the most sensitive to the surface roughness compared with Newtonian and shear thickening fluids. For a particular value of the surface fractal dimension, there exists an intersection point where shear thinning, Newtonian, and shear thickening fluids behave the same way regarding the amplitude of the velocity profile and the friction factor. This approach has a variety of potential applications, for instance fluid dynamics in hydrology, blood flow in the cardiovascular system, and many industrial applications.

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Section: Laminar Flow Of a Non-newtonian Fluid Through A Rough-walled...mentioning

confidence: 99%

Fractal Analysis of a Non-Newtonian Fluid Flow in a Rough-Walled Pipe

et al. 2022

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“…Previous hydraulic conductivity models did not consider the roughness of the tube wall in porous media such as soil. However, the results showed that flow in micron-scale tubes was more complicated than flow in millimetre-scale or larger tubes (Wang, 2007). Therefore, Ghanbarian et al (2016) proposed the calculation theory of roughness (λ) and improved the previous model:…”

Section: Unsaturated Hydraulic Conductivity Modelmentioning

confidence: 99%

Modelling soil hydraulic properties with an improved pore‐solid fractal (PSF) model through image analysis

Sun

She

Wang

et al. 2021

European J Soil Science

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“…A negative correlation was observed between the Nusselt number and Knudsen number, while a positive correlation was set for the Nusselt number and Peclet number. Another numerical investigation by Wang and Wang [16] focused on microtubes as well, however in this research the wall roughness was of main concern, particularly on a 3D scale and its effects on the laminar flow. The results showed a negative correlation between the Reynolds number and disturb areas of flow field, as the latter became larger, the first decreased in value.…”

Section: Introductionmentioning

confidence: 99%

Effects of Coil Pitch Spacing on Heat Transfer Performance of Nanofluid Turbulent Flow through Helical Microtube Heat Exchanger

Rasheed¹,

Alias²,

Salman³

2019

IJET

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This article provides Numerical simulation on forced convective heat transfer performance of Nanofluid flowing through copper helical microtube of inner diameter of 1.5 mm with different pitch using ANSYS-FLUENT 18.0. The simulation was performed for water, CuO/water, Al2O3/water Nanofluid with 1-2% volume concentration and different pitch of microtube (10, 14 and 18 mm) for turbulent flow regime of Reynolds number varied 5000 to 20000 and governing equations of mass, momentum and heat transfer were solved simultaneously, using the k-e two equations turbulence model. Based on the obtained results, regardless of the concentrations used, the nanofluids exhibited a higher transfer rate than water. This is mainly attributed to the nanoparticles that are in the used nanofluids. The friction factor and the heat transfer rate were enhanced considerably due to the shape and size of the tube, which in this case is a helical microtube. Moreover, the maximum heat transfer performance has been conducted by Al2O3/water Nanofluid with 2% volume concentration and microtube pitch of 18 mm.

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Influence of three-dimensional wall roughness on the laminar flow in microtube

Cited by 20 publications

References 21 publications

Fractal Analysis of a Non-Newtonian Fluid Flow in a Rough-Walled Pipe

Fractal Analysis of a Non-Newtonian Fluid Flow in a Rough-Walled Pipe

Modelling soil hydraulic properties with an improved pore‐solid fractal (PSF) model through image analysis

Effects of Coil Pitch Spacing on Heat Transfer Performance of Nanofluid Turbulent Flow through Helical Microtube Heat Exchanger

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