Numerical study of laminar fluid flow in a curved elliptic duct with internal fins

Papadopoulos, Polycarpos K.; Hatzikonstantinou, P.

doi:10.1016/j.ijheatfluidflow.2007.11.003

Cited by 18 publications

(20 citation statements)

References 7 publications

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“…The work of Dong and Ebadian [21] and Silva et al [22] numerically investigated the flow field and vortices formed in elliptical curved channels and has reported some differences compared to rectangular channels in the formation of secondary flow instability. Considering elliptical curved ducts with internal fins, Papadopoulos and Hatzikonstantinou [23] have numerically investigated the effect of fin height on friction factor and heat transfer. They concluded that the appearance of secondary vortices next to the concave wall would make the friction factor dependent on both fin height and duct height.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Secondary Flow Instability and Forced Convection in Fluid Flow Through Rectangular and Elliptical Curved Ducts

Chandratilleke

Nadim

Narayanaswamy

2013

Heat Transfer Engineering

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This article examines the unique fluid flow characteristics and associated forced convection in curved ducts where the flow behavior is typified by counterrotating secondary flow vortices arising from the centrifugal forces due to flow curvature. For laminar developing fluid flow through curved heated ducts, the study formulates a novel three-dimensional computational fluid dynamics model based on vortex structures (or helicity). The fluid and thermal characteristics are examined using the helicity contours in duct cross sections for a range of flow rates, wall heat fluxes, and duct aspect ratios at selected duct curvatures. Curved ducts of rectangular and elliptical cross section are analyzed to identify and compare the fundamental differences in flow characteristics for each duct type. The study also presents a new technique using dimensionless helicity for detecting the onset of hydrodynamic instability in curved ducts. Numerical predictions are validated with the available experimental data. It is observed that with increased duct flow rate, the secondary flow intensifies and beyond a certain critical flow condition leads to hydrodynamic instability in both types of ducts. However, the overall fluid flow structure, hydrodynamic instability, and forced convection are significantly dependent on the type of duct, while these aspects are also significantly influenced by the duct aspect ratio and wall heating.

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Section: Introductionmentioning

confidence: 99%

Analysis of Secondary Flow Instability and Forced Convection in Fluid Flow Through Rectangular and Elliptical Curved Ducts

Chandratilleke

Nadim

Narayanaswamy

2013

Heat Transfer Engineering

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“…It was pioneered by Hatzikonstantinou et al [3] and it has been applied successfully to quasi-3D (Q3D) internal hydrodynamic [4,5] and thermal [6,7] flow problems. It was pioneered by Hatzikonstantinou et al [3] and it has been applied successfully to quasi-3D (Q3D) internal hydrodynamic [4,5] and thermal [6,7] flow problems.…”

Section: Introductionmentioning

confidence: 99%

“…According to the CVP methodology, in order to construct the pressure variational equation we must first express the momentum equation in terms of the velocity correction by subtracting Equation (4) from Equation (3) and using the relations of Equation (5). According to the CVP methodology, in order to construct the pressure variational equation we must first express the momentum equation in terms of the velocity correction by subtracting Equation (4) from Equation (3) and using the relations of Equation (5).…”

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confidence: 99%

“…The velocity and the pressure corrections are then substituted in the relations of Equation (5) to give the updated velocity and pressure fields and this completes an iteration of the present CVP scheme. These terms are essentially a correcting factor for the deviation of the continuity equation and they are found to greatly enhance the stability of the CVP algorithm, especially in fully 3D computations.…”

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confidence: 99%

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Improved CVP scheme for laminar incompressible flows

Papadopoulos

Hatzikonstantionou

2011

Numerical Methods in Fluids

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SUMMARYAn improved scheme of the continuity vorticity pressure (CVP) variational equations method is presented. The changes from the original version of the CVP method concern the velocity and the pressure correction equations that are used in the solution procedure and the topology of the grid where the method is applied. The improved CVP scheme is faster, simpler and more stable than the original version of the method. The efficiency and the accuracy of the new scheme are tested and validated through comparison of predictions and of computational time, with numerical results obtained with the SIMPLE method. Moreover, we present extensive comparisons of the results of the improved CVP scheme with numerical and experimental data from various researchers that show excellent agreement for a wide range of benchmark 2D and 3D laminar internal flow problems such as flow over a backward facing step, flow in square, circular and elliptical curved ducts and pulsating flow.

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“…Unlike in rectangular ducts, Dean Instability was seen to originate within the flow rather than at the outer duct wall. Papadopoulos and Hatzikonstantinou [24] considered elliptical curved ducts with internal fins and have numerically investigated the effects of fin height on friction factor and heat transfer. They concluded that the appearance of secondary vortices next to the concave wall would make the friction factor dependent on both fin and duct heights.…”

Section:    mentioning

confidence: 99%