Reverse flow in channel-influence of obstruction geometry

Gowda, B. H. Lakshmana; Tulapurkara, E. G.; Swain, S K

doi:10.1007/bf00944915

Cited by 13 publications

(20 citation statements)

References 10 publications

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“…There was some sort of sealing effect from the vortices created behind the obstruction at the front side of the channel. This appears to be one of the reasons for the occurrence of the stagnant flow condition inside the test channel (Gowda and Tulapukara, 1989;Gowda et al, 1993).…”

Section: Effect Of L=b Ratiomentioning

confidence: 95%

“…It is noted that the plastic beads that did not flow along the central line were not considered for the measurement. The same technique was used by Gowda and coworkers (Gowda and Tulapurkara, 1989;Gowda et al, 1993) and Kabir (2004) to measure the surface velocity inside and outside the test channel. An average of eight sample velocities were measured and their mean values were taken for all cases.…”

Section: Reverse Flow Of Polyacrylamide Solution 693mentioning

confidence: 97%

“…The flow direction in a channel with obstruction at the entry can be reverse, forward, or stagnant, depending on the position of the obstruction (Kabir et al, 2003;Gowda and Tulapurkara, 1989). Knowledge of these reverse-flow phenomena has potential benefit in the control of various flows in process engineering applications, for example, in the control of flow to obtain low velocities, heat transfer problems providing different types of flows locally, interaction of shear layers, flow past obstruction, and constrictions in arterial flows under certain physiological situations Gowda et al, 1993).…”

Section: Introductionmentioning

confidence: 98%

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Reverse Flow Phenomena of a Polyacrylamide Solution in a Channel With an Obstacle at the Entry: Influence of Obstruction Geometry

Kabir

Khan

Rasul

2012

Chemical Engineering Communications

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This study investigates the reverse-flow phenomena of a polyacrylamide solution in a channel referred to as a ''test channel'' with obstruction geometry at the entry placed in another wider parallel-walled channel. The influence of various obstruction geometries (i.e., shapes and sizes) plays a very important role in controlling reverse-flow behavior and is investigated in this study. The obstruction geometries used in this research were: flat plate, semicircle, circle, triangle, and rectangle with various aspect ratios. Experimental investigation and numerical simulations were carried out with a non-Newtonian 0.03% (by weight) polyacrylamide solution that obeys a power-law behavior for a fixed Reynolds number of 2000. The non-Newtonian fluid results are compared with that of water. The flat plate produced the maximum reverse flow at a gap-to-width (g=w) ratio of 1, whereas the triangle produced minimum reverse flow at a g=w ratio of 0.5. The circular geometry produced the maximum forward flow, and the flat plate produced the minimum forward flow at a g=w ratio of 8. Good agreement has been observed between the experimental results and numerical simulations.

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Section: Effect Of L=b Ratiomentioning

confidence: 95%

Section: Reverse Flow Of Polyacrylamide Solution 693mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

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Reverse Flow Phenomena of a Polyacrylamide Solution in a Channel With an Obstacle at the Entry: Influence of Obstruction Geometry

Kabir

Khan

Rasul

2012

Chemical Engineering Communications

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“…This was done so that the struts supporting the duct and the obstruction do not interfere with the view, as the camera for the particle image velocimetry (PIV) studies and visualization are located below the tank (Figs. [3][4]. The duct is located midway in the channel, below the water level, with its center line 100 mm from the water surface.…”

Section: Experimental Arrangementmentioning

confidence: 99%

“…Gowda et al [3] investigated the influence of the geometry of the obstruction using different shapes like squares, circles, triangles, and semicircles. A maximum reverse flow of (U i /U ∞ ) = 0.28 was obtained for the obstruction with a triangular shape.…”

Section: Introductionmentioning

confidence: 99%

Reverse flow in a square duct with an obstruction at the entry

Sohn

Gowda

2009

J Mech Sci Technol

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In this paper, the reverse flow in a square duct with an obstruction at the front (which is a square plate), is investigated using particle image velocimetry (PIV). The gap g between the obstruction and the entry to the duct was systematically varied, and it was found that maximum reverse flow occurs around a g/w value of 0.75. The velocity vectors, vorticity plots, and other details described indicate that the flow field is different compared with the two-dimensional channel case.

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Reverse Flow in Converging Channels with Obstruction at the Entry

Mathiyalagan¹,

Gowda²

2016

Fluid Mechanics and Fluid Power – Contemporary Research

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Reverse flow in channel-influence of obstruction geometry

Cited by 13 publications

References 10 publications

Reverse Flow Phenomena of a Polyacrylamide Solution in a Channel With an Obstacle at the Entry: Influence of Obstruction Geometry

Reverse Flow Phenomena of a Polyacrylamide Solution in a Channel With an Obstacle at the Entry: Influence of Obstruction Geometry

Reverse flow in a square duct with an obstruction at the entry

Reverse Flow in Converging Channels with Obstruction at the Entry

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