Numerical Analysis of Wall Slip Effects on Flow of Newtonian and Non-Newtonian Fluids in Macro and Micro Contraction Channels

Sunarso, Alfeus; Yamamoto, Takehiro; Môri, N.

doi:10.1115/1.2375127

Cited by 19 publications

(12 citation statements)

References 15 publications

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“…According to the numerical results that the weak slip increases the vortex length and the strong slip reduces it, the present experimental results are found to be Fig. 7 Channel geometry for numerical simulation by Sunarso et al (10) Journal of Fluid Science and Technology Vol.3, No.8, 2008 qualitatively in agreement with the numerical results by Sunarso and co-workers.…”

Section: Journal Of Fluid Science and Technologysupporting

confidence: 90%

“…10(a) and (b). If the test fluid slips on the wall apparently and strongly, the vortex is considered to be reduced as shown by the numerical simulation (10) .…”

Section: Velocity Field In Microchannelmentioning

confidence: 98%

“…Recently, Sunarso et al (10) numerically simulated the microchannel flows of Newtonian and non-Newtonian fluids through a two-dimensional 4:1 abrupt contraction as illustrated in Fig. 7, and discussed the wall slip effect on the vortex enhancement.…”

Section: Journal Of Fluid Science and Technologymentioning

confidence: 99%

“…Fan et al (6) simulated the behavior of DNA molecules in the microchannel flow through a parallel plate channel. However, the study on a non-Newtonian flow through a microchannel is very few (7) - (10) .…”

Section: Introductionmentioning

confidence: 99%

“…Webster et al (19) considered transient flows for Oldroyd-B fluid using numerical simulation. Sunarso et al (10) calculated the contraction flows of non-Newtonian fluids considering a wall slip in a microchannel.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Entry Flows of Polymer Solutions through a Planar Contraction in a Microchannel

Yasuda

Sugiura²

2008

JFST

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Flows of polymer solutions through a 3.7:1 abrupt contraction were observed in a micro-and a regular-size channels with rectangular cross sections. The test fluids are three kinds of 0.2 wt% aqueous solutions of polyacrylamide whose rheological properties are different with each other. In the previous works, apparent slips were observed on the channel wall for the polymer solutions and the slip levels of these solutions are considered to be different. In the present paper, the growth of the salient corner vortex is discussed as a function of the shear rate. Consequently, the vortex size in the microchannel is larger than that in the regular-size channel for the flow of polymer solution whose slip level is weak, whereas the vortex size in the microchannel is smaller than that in the regular-size channel for the flow of polymer solution whose slip level is strong.

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Section: Journal Of Fluid Science and Technologysupporting

confidence: 90%

“…10(a) and (b). If the test fluid slips on the wall apparently and strongly, the vortex is considered to be reduced as shown by the numerical simulation (10) .…”

Section: Velocity Field In Microchannelmentioning

confidence: 98%

Section: Journal Of Fluid Science and Technologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Entry Flows of Polymer Solutions through a Planar Contraction in a Microchannel

Yasuda

Sugiura²

2008

JFST

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Implementation of slip boundary conditions in the finite volume method: new techniques

Ferrás

Nóbrega

Pinho

2012

Numerical Methods in Fluids

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SUMMARY Two different techniques for the implementation of the linear and nonlinear slip boundary conditions into a finite volume method based numerical code are presented. For the linear Navier slip boundary condition, an implicit implementation in the system of equations is carried out for which there is no need for any relaxation, especially when handling high slip coefficients. For three different nonlinear slip boundary conditions, two different methods are devised, one based on solving a transcendental equation for the boundary and the other on the linearization of the slip law. For assessment purposes, comparison is made between these new methods and the usual iterative process. With these new methods, the convergence difficulties, typical of the iterative procedure, are eliminated, and for some of the test cases, the convergence rate even increased with the slip velocity. The details of these implementations are given first for a simple geometry using orthogonal meshes and Cartesian coordinates followed by their generalization to non‐Cartesian coordinates and nonorthogonal meshes. The developed code was tested in the benchmark slip‐stick and 4:1 contraction flows, evidencing the robustness of the proposed procedures. Copyright © 2013 John Wiley & Sons, Ltd.

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Experimental and Computational Investigation of the IDDSI Flow Test of Liquids Used in Dysphagia Management

Hanson¹,

Jamshidi²,

Redfearn³

et al. 2019

Ann Biomed Eng

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The International Dysphagia Diet Standardisation Initiative (IDDSI) flow test, using a standard 10-mL syringe, is being adopted in many countries for clinical measurement of the consistency of drinks. The working hypothesis is that thickening drinks to retard flow can be advantageous for individuals who struggle to cope with thin drinks. This study assesses how the IDDSI test relates to rheology and clinical knowledge of physiological flows during swallowing. With no pre-existing analytical solution for internal flow through the syringe, a computational model was designed, incorporating rheometry data from a variety of Newtonian and non-Newtonian liquids. The computational model was validated experimentally across the range of liquids but the technique showed limitations in simulating dripping and cohesiveness. Gum-based liquids which were strongly shear-thinning (0.12 < n < 0.25) showed plug-flow characteristics with 90% of the shear occurring in only 22% of the radial dimension. Shear rates were maximal at the nozzle outlet (> 60 times higher than the barrel) and reached 7400/s for the thinnest gum-based liquid. Shear rheology data alone was unable to describe the flow of these drinks. The flow conditions in the test varied according to the type and consistency of liquid, relating to the desired clinical effect.

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Numerical Analysis of Wall Slip Effects on Flow of Newtonian and Non-Newtonian Fluids in Macro and Micro Contraction Channels

Cited by 19 publications

References 15 publications

Entry Flows of Polymer Solutions through a Planar Contraction in a Microchannel

Entry Flows of Polymer Solutions through a Planar Contraction in a Microchannel

Implementation of slip boundary conditions in the finite volume method: new techniques

Experimental and Computational Investigation of the IDDSI Flow Test of Liquids Used in Dysphagia Management

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