Experimental analysis of turbulent flow structure in a fully developed rib-roughened rectangular channel with PIV

Islam, Mohammed Saiful; Haga, Katsuhiro; Kaminaga, Masanori; Hino, Ryutaro; Monde, Masanori

doi:10.1007/s00348-002-0432-9

Cited by 44 publications

(17 citation statements)

References 11 publications

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“…The distribution of w rms in this plane is fairly well established as early as the second rib and quickly settles down into a periodic pattern with small variations. results are consistent with a particle image velocimetry (PIV) study of turbulent water flow through a ribbed duct, which found that flow reattachment remains constant at about four rib heights (x % 0.95) after the Reynolds number increases past a critical value of 15,000 (Islam et al, 2002).…”

Section: Distributions Of Mean Flow and Turbulent Quantities In Develsupporting

confidence: 87%

“…Heat transfer experiments have been presented detailing measurements in ducts similar to those in all three regions of the present study, including developing flow (Han and Park, 1988;Liou and Hwang, 1992a;Wagner et al, 1992;Wang et al, 2001;Chang and Morris, 2003), fully developed flow (Han, 1984;Liou and Hwang, 1992b;Baughn and Yan, 1992;Fann et al, 1994;Park et al, 1998;Mochizuki et al, 1999;Ekkad et al, 2000;Chen et al, 2000;Islam et al, 2002;Rau et al, 1998), and flow in the 180°b end region . In addition, flow measurements in the fully developed region have been obtained using LDV measurements (Rau et al, 1998;Sato et al, 1989;Liou et al, 1993a;Graham et al, 2004) and hot-wire anemometer measurements (Hirota et al, 1992).…”

Section: Review Of Relevant Studiesmentioning

confidence: 96%

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Experimental validation of large eddy simulations of flow and heat transfer in a stationary ribbed duct

Sewall

Tafti

Graham

et al. 2006

International Journal of Heat and Fluid Flow

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Section: Distributions Of Mean Flow and Turbulent Quantities In Develsupporting

confidence: 87%

Section: Review Of Relevant Studiesmentioning

confidence: 96%

Experimental validation of large eddy simulations of flow and heat transfer in a stationary ribbed duct

Sewall

Tafti

Graham

et al. 2006

International Journal of Heat and Fluid Flow

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“…According to those investigators, the flow repeats itself periodically after the 4th rib. The major flow features show a certain dependence on the Reynolds number based on the hydraulic diameter up to Re = 1.5 9 10 4 , but they are mostly unaffected by further increase in Reynolds number (Islam et al 2002).…”

Section: Flow Over Rib-roughened Wallmentioning

confidence: 98%

Flow field investigation in rotating rib-roughened channel by means of particle image velocimetry

et al. 2011

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The turbulent velocity field over the ribroughened wall of an orthogonally rotating channel is investigated by means of two-dimensional particle image velocimetry (PIV). The flow direction is outward, with a bulk Reynolds number of 1.5 9 10 4 and a rotation number ranging from 0.3 to 0.38. The measurements are obtained along the wall-normal/streamwise plane at mid-span. The PIV system rotates with the channel, allowing to measure directly the relative flow velocity with high spatial resolution. Coriolis forces affect the stability of the boundary layer and free shear layer. Due to the different levels of shear layer entrainment, the reattachment point is moved downstream (upstream) under stabilizing (destabilizing) rotation, with respect to the stationary case. Further increase in rotation number pushes further the reattachment point in stabilizing rotation, but does not change the recirculation length in destabilizing rotation. Turbulent activity is inhibited along the leading wall, both in the boundary layer and in the separated shear layer; the opposite is true along the trailing wall. Coriolis forces affect indirectly the production of turbulent kinetic energy via the Reynolds shear stresses and the mean shear. Twopoint correlation is used to characterize the coherent motion of the separated shear layer. Destabilizing rotation is found to promote large-scale coherent motions and accordingly leads to larger integral length scales; on the other hand, the spanwise vortices created in the separating shear layer downstream of the rib are less organized and tend to be disrupted by the three-dimensional turbulence promoted by the rotation. The latter observation is consistent with the distributions of span-wise vortices detected in instantaneous flow realizations.

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“…In order to validate the CFD model at higher rotational velocities, PIV experiments were performed on a prototype CSAF unit. PIV is a powerful non-intrusive technique to obtain fluid velocities and has been used extensively as a stand-alone method for fluid flow studies (Hill et al, 2000;Hopkins et al, 2000;Pruvost et al, 2000;Shafiqul Islam et al, 2002;Xiong et al, 2003) as well as in conjunction with CFD models (Armenante et al, 1997;Khopkar et al, 2003;Ranade, 1997). These studies include using CFD and PIV to investigate hydrodynamics in bioreactors (Haut et al, 2003;Vial et al, 2002), highlighting the potential use of CFD in modeling and optimizing bioprocessing equipment.…”

Section: Validation Of Cfd Simulationsmentioning

confidence: 96%

Optimizing the rotor design for controlled-shear affinity filtration using computational fluid dynamics

Francis¹,

Martinez²,

Taghipour³

et al. 2006

Biotechnol. Bioeng.

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Controlled shear affinity filtration (CSAF) is a novel integrated processing technology that positions a rotor directly above an affinity membrane chromatography column to permit protein capture and purification directly from cell culture. The conical rotor is intended to provide a uniform and tunable shear stress at the membrane surface that inhibits membrane fouling and cell cake formation by providing a hydrodynamic force away from and a drag force parallel to the membrane surface. Computational fluid dynamics (CFD) simulations are used to show that the rotor in the original CSAF device (Vogel et al., 2002) does not provide uniform shear stress at the membrane surface. This results in the need to operate the system at unnecessarily high rotor speeds to reach a required shear stress of at least 0.17 Pa at every radial position of the membrane surface, compromising the scale-up of the technology. Results from CFD simulations are compared with particle image velocimetry (PIV) experiments and a numerical solution for low Reynolds number conditions to confirm that our CFD model accurately describes the hydrodynamics in the rotor chamber of the CSAF device over a range of rotor velocities, filtrate fluxes, and (both laminar and turbulent) retentate flows. CFD simulations were then carried out in combination with a root-finding method to optimize the shape of the CSAF rotor. The optimized rotor geometry produces a nearly constant shear stress of 0.17 Pa at a rotational velocity of 250 rpm, 60% lower than the original CSAF design. This permits the optimized CSAF device to be scaled up to a maximum rotor diameter 2.5 times larger than is permissible in the original device, thereby providing more than a sixfold increase in volumetric throughput.

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Experimental analysis of turbulent flow structure in a fully developed rib-roughened rectangular channel with PIV

Cited by 44 publications

References 11 publications

Experimental validation of large eddy simulations of flow and heat transfer in a stationary ribbed duct

Experimental validation of large eddy simulations of flow and heat transfer in a stationary ribbed duct

Flow field investigation in rotating rib-roughened channel by means of particle image velocimetry

Optimizing the rotor design for controlled-shear affinity filtration using computational fluid dynamics

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