A numerical study of flow through wavy-walled channels

Selvarajan, S; Tulapurkara, E. G.; Ram, V. Vasanta

doi:10.1002/(sici)1097-0363(19980315)26:5<519::aid-fld630>3.0.co;2-c

Cited by 27 publications

(18 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ow inside periodic, modulated channel or tube exhibits an abundance of interesting physics depending upon the modulation amplitude and frequency, and the ow rate of the passing uid. For Newtonian uid, numerical results and experimental ow visualizations showed that recirculation regions, often referred to as vortices, would form beneath the modulation crest beyond a certain critical Reynolds number that decreases exponentially as the modulation amplitude or the wavenumber increases [1,[12][13][14][15][31][32][33][34][35][36][37][38]. The size of the recirculation ow region as identiÿed by the distance between the separation and reattachment points varies with Reynolds number as Re increases beyond the critical Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

On the interplay between inertial and viscoelastic effects for the flow in weakly modulated channels

Abu-Ramadan

Khayat

2005

Numerical Methods in Fluids

View full text Add to dashboard Cite

SUMMARYThe ow inside a spatially modulated channel is examined for viscoelastic uids of the Oldroyd-B type. The lower wall is at and the upper wall is sinusoidally modulated. The modulation amplitude is assumed to be small. Thus, a regular perturbation expansion of the ow ÿeld coupled to a variable-step ÿnite-di erence scheme is used to solve the problem. Convergence and accuracy assessment against earlier experimental results indicate that there is a signiÿcant range of validity of the perturbation approach. The in uences of wall geometry, inertia and viscoelasticity on the ow kinematics and stresses are investigated systematically. In particular, the interplay between the ow and uid parameters e ects on the conditions for the onset of back ow, number of vortices, their size and location is revealed. The distance between the ow separation and reattachment locations identiÿes the vortex size. Nonmonotonic dependence of the vortex size on elasticity is reported. The critical conditions for the onset of negative elasticity e ects on vortex size are identiÿed. The critical Reynolds number for the onset of back ow initially decreases then levels o or even increases as elasticity increases. For highly elastic uid and large enough Reynolds number, more than one vortex appear near the lower wall.

show abstract

Section: Introductionmentioning

confidence: 99%

On the interplay between inertial and viscoelastic effects for the flow in weakly modulated channels

Abu-Ramadan

Khayat

2005

Numerical Methods in Fluids

View full text Add to dashboard Cite

show abstract

“…This is not unexpected upon examination of the governing equation. As shown in Equations (5) and (6), terms that cause the time-dependency in flow diminish by increasing the gap and consequently, flow behaves as Couette flow between two parallel plates at wide gaps.…”

Section: Resultsmentioning

confidence: 99%

Turbulent couette flow between corrugated walls: The case with motion of one wall perpendicular to the corrugation cavities

et al. 2014

View full text Add to dashboard Cite

In this work, we numerically examine the two dimensional flow of a Newtonian fluid in the gap formed between two opposing cavities. The fluid is driven by the motion of the upper cavity and the case considered represents a simplified version of the geometry found in Low Consistency (LC) refiners. Numerical studies were conducted in which we characterized the effect of gap size on the flow field. Then, we examine material transport between the cavities by introducing a passive scalar to represent the motion of tracer particles. A large number of unsteady simulations were conducted over the range of velocities and gap sizes. Over the range of parameters studied, we identify two characteristic flow fields, defined as either steady or unsteady.

show abstract

“…This work raises questions about the dissipation process and its role in such a flow. Selvaraja et al [10] develop a numerical procedure for examining the fluid motion during flow in a channel. The boundary conditions are applied at the mean surface of the channel and the primitive variables are inflated in a series with the wall amplitude as the perturbation parameter using pseudospectral collocation method the key attribute of this method is not restricted by the reynolds number of the flow and the wave number and frequency of the wavy-walled channel.…”

Section: Fig2 Contours Of Turbulence Intensity and A Dimensional Temmentioning

confidence: 99%

A Review on Heat Transfer and Fluid Flow Over Wavy Channel or Surface

2017

IJRTER

View full text Add to dashboard Cite

Abstract-This paper concentrates to extensive review on the fluid flow and heat transfer over an wavy surface and channel. Wavy surfaces and channel have been employed in many environmental and industrial applications. The key factor for adopting such shaped (wavy) instead of using flat surface is due to improving the mass and heat transfer mechanisms, associated with large pressure variations. Fundamentally, the fully developed flow over a wavy surface, in either laminar or turbulent regime, is much further complex than that over a flat surface because of the additional parameters to be utilized and the correlated flow phenomena to be deduced. Numerous researches perform numericalcomputation simulations and experimentation in order to explore the flow characteristics over wavy surfaces are stated in this paper.

show abstract

A numerical study of flow through wavy-walled channels

Cited by 27 publications

References 24 publications

On the interplay between inertial and viscoelastic effects for the flow in weakly modulated channels

On the interplay between inertial and viscoelastic effects for the flow in weakly modulated channels

Turbulent couette flow between corrugated walls: The case with motion of one wall perpendicular to the corrugation cavities

A Review on Heat Transfer and Fluid Flow Over Wavy Channel or Surface

Contact Info

Product

Resources

About