Influence of the wall roughness on a linear shear flow

Assoudi, R.; Lamzoud, K.; Chaoui, Mohamed

doi:10.5937/fmet1802272a

Cited by 9 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, only a handful of these publications were concerned with the effect of the surface quality, its replication ability and the applied processing parameters on the final product. Furthermore, no complex study analysing the influence of surface quality on the flow length of a polymer or the effect of flow length on the mechanical properties has yet been completed [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Influence of Surface Quality on Flow Length and Micro-Mechanical Properties of Polycarbonate

et al. 2021

View full text Add to dashboard Cite

This study describes the influence of polymer flow length on mechanical properties of tested polymer, specifically polycarbonate. The flow length was examined in a spiral shaped mould. The mould cavity’s surface was machined by several methods, which led to differing roughness of the surface. The cavity was finished by milling, grinding and polishing. In order to thoroughly understand the influence of the mould surface quality on the flow length, varying processing parameters, specifically the pressure, were used. The polymer part was divided into several segments, in which the micro-mechanical properties, such as hardness and indentation modulus were measured. The results of this study provide interesting data concerning the flow length, which was up to 3% longer for rougher surfaces, but shorter in cavities with polished surface. These results are in disagreement with the commonly practiced theory, which states that better surface quality leads to greater flow length. Furthermore, evaluation of the micro-mechanical properties measured along the flow path demonstrated significant variance in researched properties, which increased by 35% (indentation hardness) and 86% by indentation modulus) in latter segments of the spiral in comparison with the gate.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In these studies, however, the influence of the surface roughness was not included. On the other hand, the influence of the wall roughness on a linear shear flow was investigated by Assoudi et al [7]. Furthermore, Ebrahimi et al [8] have studied the wall slip of molten polymers influenced by the surface roughness.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Surface Quality on Flow Length and Micro-Mechanical Properties of Polycarbonate

et al. 2021

View full text Add to dashboard Cite

show abstract

“…It can be seen that velocity attenuates near the wall, so that it allows particles to settle easily at the bottom. This phenomenon was the subject of various studies focused on the modelling of flow motion near to smooth and roughness wall [17].…”

Section: Flow Patternmentioning

confidence: 99%

Improving removal efficiency of sedimentation tanks using different inlet and outlet position

Bouisfi¹,

Bouisfi²,

Ouarriche³

et al. 2019

FME Transactions

Self Cite

View full text Add to dashboard Cite

Sedimentation by gravity is the oldest water treatment. Inlet and outlet of rectangular sedimentation tank are often located in the middle of the tank. The present investigation studies the effect of changing inlet and outlet position of rectangular sedimentation tank on removal efficiency using Computational Fluid Dynamics method. Two different configurations are proposed and they have been tested with varying particles diameters and concentration. Numerical model ability to describe flow field behaviour inside the tank is confirmed by an experimentation data. Results show that inlet and outlet position influence the flow field and removal efficiency of sedimentation tanks, especially for the case of fine particles (50 and 120µm).

show abstract

“…Kunert et al [14] measured the high-speed drainage of liquid films squeezed between a smooth sphere and a randomly rough plane by using lattice Boltzmann simulations. The flow of second order generated by the wall roughness of small amplitude has been calculated in a previous study by Assoudi et al [15]. After that, Assoudi et al [16] treated the motion of a spherical particle along a rough wall in a shear flow.…”

Section: Introductionmentioning

confidence: 99%

A Sphere Held Fixed in a Poiseuille Flow near a Rough Wall

Lamzoud¹,

Assoudi²,

Bouisfi³

et al. 2021

Nelin. Dinam.

View full text Add to dashboard Cite

We present here an analytical calculation of the hydrodynamic interactions between a smooth spherical particle held fixed in a Poiseuille flow and a rough wall. By the assumption of a low Reynolds number, the flow around a fixed spherical particle is described by the Stokes equations. The surface of the rigid wall has periodic corrugations, with small amplitude compared with the sphere radius. The asymptotic development coupled with the Lorentz reciprocal theorem are used to find the analytical solution of the couple, lift and drag forces exerted on the particle, generated by the second-order flow due to the wall roughness. These hydrodynamic effects are evaluated in terms of amplitude and period of roughness and also in terms of the distance between sphere and wall.

show abstract

Influence of the wall roughness on a linear shear flow

Cited by 9 publications

References 10 publications

The Influence of Surface Quality on Flow Length and Micro-Mechanical Properties of Polycarbonate

The Influence of Surface Quality on Flow Length and Micro-Mechanical Properties of Polycarbonate

Improving removal efficiency of sedimentation tanks using different inlet and outlet position

A Sphere Held Fixed in a Poiseuille Flow near a Rough Wall

Contact Info

Product

Resources

About