Turbulence measurements in decaying swirl flow in a pipe

Algifri, A. H.; Bhardwaj, R. K.; Rao, Yongsheng

doi:10.1007/bf00384689

Cited by 29 publications

(18 citation statements)

References 3 publications

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“…Turbulence in decaying swirling flow through a pipe was studied by Algifri et al [3] using a hot-wire probe. Air was used as the working fluid and it was given a swirling motion by means of a radial cascade.…”

mentioning

confidence: 99%

Local Velocity Measurements and Computational Fluid Dynamics (CFD) Simulations of Swirling Flow in a Cylindrical Cyclone Separator

Erdal

Shirazi

2004

Journal of Energy Resources Technology

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Local measurements and 3-D CFD simulations in GasLiquid cylindrical Cyclone (GLCC © ) separators are scarce. The main objective of this study is to conduct local measurements and 3-D CFD simulations to understand the swirling flow behavior in a cylindrical cyclone with one inclined tangential inlet. Axial and tangential velocities and turbulent intensities across the GLCC © diameter (ID=3.5″) were measured at 24 different axial locations (12.5″ to 35.4″ below the inlet) by using a Laser Doppler Velocimeter (LDV). The liquid flow rate was 72GPM, which corresponds to an average axial velocity of 0.732 m/s and Reynolds number of 66,900. Measurements are used to create color contour plots of axial and tangential velocity and turbulent kinetic energy. Color contour maps revealed details of the flow behavior. Additionally, 3-D CFD simulations with different turbulence models are conducted. Simulations results are compared to LDV measurements.

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mentioning

confidence: 99%

Local Velocity Measurements and Computational Fluid Dynamics (CFD) Simulations of Swirling Flow in a Cylindrical Cyclone Separator

Erdal

Shirazi

2004

Journal of Energy Resources Technology

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“…(15), (17), (18), (19) and (23) in Eqs. (12) and (13), the axial and tangential momentum equations are obtained as:…”

Section: Solution Methodologymentioning

confidence: 98%

“…(24) and (25) are δ z and E, while the wall shear stresses along axial and tangential directions could be obtained from (18) and (19).…”

Section: Solution Methodologymentioning

confidence: 99%

“…Their results showed that the mean velocities and Reynolds stresses are weakly influenced by Reynolds number but strongly depend on the entrance swirl number. Chang and Dhir [20] and Algifri et al [19] have shown that swirling flows due to the high maximum axial velocity near the wall and high mixing in annular region of the pipe because of high turbulence level increase the total heat transfer rate from the wall to the flow.…”

Section: Introductionmentioning

confidence: 98%

“…Several experimental researches have been conducted on the swirling flow such as Yajnik and Subbaiah [17], Kitoh [18], Algifri et al [1,19] and Chang and Dhir [20]. Studies have been focused on swirling flow features, estimating tangential and axial velocity profile, wall shear stresses and comparing predicted turbulence variables with the experimental data [17,18].…”

Section: Introductionmentioning

confidence: 98%

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Analytical investigation of boundary layer growth and swirl intensity decay rate in a pipe

et al. 2010

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In this research, the developing turbulent swirling flow in the entrance region of a pipe is investigated analytically by using the boundary layer integral method. The governing equations are integrated through the boundary layer and obtained differential equations are solved with forth-order Adams predictor-corrector method. The general tangential velocity is applied at the inlet region to consider both free and forced vortex velocity profiles. The comparison between present model and available experimental data demonstrates the capability of the model in predicting boundary layer parameters (e.g. boundary layer growth, shear rate and swirl intensity decay rate). Analytical results showed that the free vortex velocity profile can better predict the boundary layer parameters in the entrance region than in the forced one. Also, effects of pressure gradient inside the boundary layer is investigated and showed that if pressure gradient is ignored inside the boundary layer, results deviate greatly from the experimental data.

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Optimizing swirl in compact uniflow cyclones

et al. 2018

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This paper presents an experimental examination of the velocity field distribution in the separation chamber of a uniflow cyclone with closed particle outlet to evaluate the swirl characteristics in the vortex finder region based on stereoscopic particle image velocimetry. A cold flow model with a closed particle outlet was used to assess different angles of attack and core size ratios at typical Reynolds numbers for the separation of low loaded gas‐solid flows. The focus of the study was on the relationship between swirl strength as well as performance data. At higher angles, the parabolic swirl strength distribution changed to a region with constant high acceleration of the particles in the separation zone. Integral and differential swirl numbers were correlated with the ratio of tangential to radial velocity and to the calculated cut size diameter. At low angles of attack, implying a strong redirection of flow perpendicular toward the main flow direction and small core size ratios, defined by the radial distance between hub and tip, the local differential swirl number can be more than twice as large as in the base configuration. Yet, the integral swirl number hardly changed. The velocity fields showed mean tangential to radial velocity ratios ranging from 0.73 to 6.85 at swirl vane angles of 15 °–60 °; core size ratios between 0.125 and 0.625 at vortex finder diameter were measured and calculated cut size diameters between 10 and 90 μm were derived. This data provides the foundation for further validation studies and the development of new design criteria. © 2018 American Institute of Chemical Engineers AIChE J, 65: 766–776, 2019

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Turbulence measurements in decaying swirl flow in a pipe

Cited by 29 publications

References 3 publications

Local Velocity Measurements and Computational Fluid Dynamics (CFD) Simulations of Swirling Flow in a Cylindrical Cyclone Separator

Local Velocity Measurements and Computational Fluid Dynamics (CFD) Simulations of Swirling Flow in a Cylindrical Cyclone Separator

Analytical investigation of boundary layer growth and swirl intensity decay rate in a pipe

Optimizing swirl in compact uniflow cyclones

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