Two-Dimensional Laminar Flow in Elbows

Orlandi, P.; Cunsolo, D.

doi:10.1115/1.3448951

Cited by 5 publications

(1 citation statement)

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“…Boundary layer is developed first in the external wall and travels through the sides to the internal wall where both flows interact, giving origin to a flow, which leaves the internal wall and is directed toward the external one, forming a secondary flow [8]. The axial pressure gradient produces primary flow separation when Dean number [ Re(D/rb) 1/2 ] is too large.…”

Section: Flow Behavior In Curved Pipesmentioning

confidence: 99%

Experimental and numerical curved flow study for metrology purposes

Gómez¹,

Toledo²,

Quinto³

et al. 2003

JART

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Most of the current volumetric flow measurement methods represent an important investment for many industries. However, when the accuracy requirements for the processes are not too high, curved pipes could be used as primary elements for this purpose. Unfortunately, there is a lack of information for this device as flowmeter, so more experimental and numerical research is required for its full characterization. This paper reports the experimental work conducted on three commercial 90º elbows, installed horizontally. All of them were short curvature radius with 0.75, 1 and 1.5 inches of internal diameter; water maintained at 24 ºC was employed for the experiments. Pressure taps on the elbows were located at 45 º along the curvature radius, on both inside and outside the wall. The performance of the elbow was compared against a calibrated orifice plate. A numerical study using CFD-2000 provided more information about the pressure and velocity fields, so it was posible to develop a model to describe the curvature effects on the radial pressure gradient. Experimental results show that there is a greater sensibility of the element when the curvature radius decreases, this means, a larger pressure gradient is obtained. If this radial pressure gradient is used in the typical equation for the orifice plate, a good concordance between the measurements of both elements is observed.

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Section: Flow Behavior In Curved Pipesmentioning

confidence: 99%

Experimental and numerical curved flow study for metrology purposes

Gómez¹,

Toledo²,

Quinto³

et al. 2003

JART

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A numerical study of laminar and turbulent flows in a two‐dimensional bend with or without a guide vane

Kotb

Mokhtarzadeh‐Dehghan

Ward-Smith

1988

Numerical Meth Engineering

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SUMMARYA numerical study of the flow in a two-dimensional 90" circular-arc bend is presented. The study is based on the solution of the governing equations using a finite volume technique. Both laminar and turbulent flows are considered. Particular attention is given to the occurrence and size of the separation regions and, in this respect, the effects of Reynolds number and bend radius to height ratio are discussed. The study includes the effect of a guide vane, placed in the bend, on the flow characteristics. It is shown that the emerging velocity distribution is more uniform than that associated with flow in a bend without a guide vane. The presence of a guide vane is shown to suppress the formation of regions of flow separation. Comparisons are made between the effects on the flow of two different designs of guide vane.

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Calculation of laminar flow of compressible gas in the presence of heat transfer in two-dimensional curvilinear channels

Grabovskii¹,

Zhestkov²

1983

Fluid Dyn

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Two-Dimensional Laminar Flow in Elbows

Cited by 5 publications

References 0 publications

Experimental and numerical curved flow study for metrology purposes

Experimental and numerical curved flow study for metrology purposes

A numerical study of laminar and turbulent flows in a two‐dimensional bend with or without a guide vane

Calculation of laminar flow of compressible gas in the presence of heat transfer in two-dimensional curvilinear channels

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