The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Beşir Sahin - One of the best experts on this subject based on the ideXlab platform.
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gas solid flow behavior in a Horizontal Pipe after a 90 vertical to Horizontal elbow
Powder Technology, 2001Co-Authors: Huseyin Akilli, Ek Levy, Beşir SahinAbstract:Abstract The characteristics of the particle flow in a Horizontal Pipe following a 90° vertical-to-Horizontal elbow were investigated both numerically and experimentally. Laboratory experiments were conducted in a 0.154 m ID test section. The effects of air velocity, the ratio of air-to-solids mass flow rate, geometry of the elbow and inlet conditions on gas–solid flow patterns were investigated experimentally. Pulverized coal with a mean particle diameter of 50 μm was used as the solid material. Experiments were performed with conveying air velocities ranging from 15 to 30 m/s and air-to-solids mass flow rate ratios of 1 and 3, with elbows having bend radius to Pipe diameter ratios of 1.5 and 3. Measurements of particle concentration and particle velocity were performed at various locations along the Horizontal Pipe using a fiber-optic probe which was traversed over the Pipe cross-section of the Pipe. It was observed that the strong rope created by the elbow disintegrates within an axial distance of 10 Pipe diameters. Fully developed concentration and velocity profiles were obtained within approximately 30 Pipe diameters from the elbow exit plane. The rope behavior was different for the two elbows studied ( R / D =1.5 and 3). The shapes of the fully developed profiles were found to be independent of inlet conditions. CFD simulations of gas–solid flow through 90° circular elbows were performed using the Lagrangian approach. The simulations were used to predict the location of the rope and its dispersion rate along the Horizontal Pipe after the elbow exit plane.
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Gas–solid flow behavior in a Horizontal Pipe after a 90° vertical-to-Horizontal elbow
Powder Technology, 2001Co-Authors: Huseyin Akilli, Ek Levy, Beşir SahinAbstract:Abstract The characteristics of the particle flow in a Horizontal Pipe following a 90° vertical-to-Horizontal elbow were investigated both numerically and experimentally. Laboratory experiments were conducted in a 0.154 m ID test section. The effects of air velocity, the ratio of air-to-solids mass flow rate, geometry of the elbow and inlet conditions on gas–solid flow patterns were investigated experimentally. Pulverized coal with a mean particle diameter of 50 μm was used as the solid material. Experiments were performed with conveying air velocities ranging from 15 to 30 m/s and air-to-solids mass flow rate ratios of 1 and 3, with elbows having bend radius to Pipe diameter ratios of 1.5 and 3. Measurements of particle concentration and particle velocity were performed at various locations along the Horizontal Pipe using a fiber-optic probe which was traversed over the Pipe cross-section of the Pipe. It was observed that the strong rope created by the elbow disintegrates within an axial distance of 10 Pipe diameters. Fully developed concentration and velocity profiles were obtained within approximately 30 Pipe diameters from the elbow exit plane. The rope behavior was different for the two elbows studied ( R / D =1.5 and 3). The shapes of the fully developed profiles were found to be independent of inlet conditions. CFD simulations of gas–solid flow through 90° circular elbows were performed using the Lagrangian approach. The simulations were used to predict the location of the rope and its dispersion rate along the Horizontal Pipe after the elbow exit plane.
V. G. Sviridov - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulations of mixed convection in liquid metal flow within a Horizontal Pipe with transverse magnetic field
Fluid Dynamics Research, 2018Co-Authors: Yaroslav Listratov, Oleg Zikanov, D. Ognerubov, V. G. SviridovAbstract:Flow of a liquid metal through a Horizontal Pipe with imposed transverse Horizontal magnetic field and constant-rate heating applied to the lower half of the wall is analyzed using high-resolution numerical simulations. The focus of the study is on the anomalous high-amplitude fluctuations of temperature detected in earlier experiments. An extensive parametric study reveals the effect of the Grashof, Reynolds, and Hartmann numbers on this phenomenon.
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Natural convection in Horizontal Pipe flow with a strong transverse magnetic field
Journal of Fluid Mechanics, 2013Co-Authors: Oleg Zikanov, Yaroslav Listratov, V. G. SviridovAbstract:Linear stability analysis and direct numerical simulations are conducted to analyse mixed convection in a liquid metal flow in a Horizontal Pipe with imposed transverse magnetic field. The Pipe walls are electrically insulated and subject to constant flux heating in the lower half. The results reveal the nature of anomalous temperature fluctuations detected in earlier experiments. It is found that, at the magnetic field strength far exceeding the laminarization threshold, the natural convection develops in the form of coherent quasi-two-dimensional rolls aligned with the magnetic field. Transport of the rolls by the mean flow causes high-amplitude, low-frequency fluctuations of temperature.
Huseyin Akilli - One of the best experts on this subject based on the ideXlab platform.
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gas solid flow behavior in a Horizontal Pipe after a 90 vertical to Horizontal elbow
Powder Technology, 2001Co-Authors: Huseyin Akilli, Ek Levy, Beşir SahinAbstract:Abstract The characteristics of the particle flow in a Horizontal Pipe following a 90° vertical-to-Horizontal elbow were investigated both numerically and experimentally. Laboratory experiments were conducted in a 0.154 m ID test section. The effects of air velocity, the ratio of air-to-solids mass flow rate, geometry of the elbow and inlet conditions on gas–solid flow patterns were investigated experimentally. Pulverized coal with a mean particle diameter of 50 μm was used as the solid material. Experiments were performed with conveying air velocities ranging from 15 to 30 m/s and air-to-solids mass flow rate ratios of 1 and 3, with elbows having bend radius to Pipe diameter ratios of 1.5 and 3. Measurements of particle concentration and particle velocity were performed at various locations along the Horizontal Pipe using a fiber-optic probe which was traversed over the Pipe cross-section of the Pipe. It was observed that the strong rope created by the elbow disintegrates within an axial distance of 10 Pipe diameters. Fully developed concentration and velocity profiles were obtained within approximately 30 Pipe diameters from the elbow exit plane. The rope behavior was different for the two elbows studied ( R / D =1.5 and 3). The shapes of the fully developed profiles were found to be independent of inlet conditions. CFD simulations of gas–solid flow through 90° circular elbows were performed using the Lagrangian approach. The simulations were used to predict the location of the rope and its dispersion rate along the Horizontal Pipe after the elbow exit plane.
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Gas–solid flow behavior in a Horizontal Pipe after a 90° vertical-to-Horizontal elbow
Powder Technology, 2001Co-Authors: Huseyin Akilli, Ek Levy, Beşir SahinAbstract:Abstract The characteristics of the particle flow in a Horizontal Pipe following a 90° vertical-to-Horizontal elbow were investigated both numerically and experimentally. Laboratory experiments were conducted in a 0.154 m ID test section. The effects of air velocity, the ratio of air-to-solids mass flow rate, geometry of the elbow and inlet conditions on gas–solid flow patterns were investigated experimentally. Pulverized coal with a mean particle diameter of 50 μm was used as the solid material. Experiments were performed with conveying air velocities ranging from 15 to 30 m/s and air-to-solids mass flow rate ratios of 1 and 3, with elbows having bend radius to Pipe diameter ratios of 1.5 and 3. Measurements of particle concentration and particle velocity were performed at various locations along the Horizontal Pipe using a fiber-optic probe which was traversed over the Pipe cross-section of the Pipe. It was observed that the strong rope created by the elbow disintegrates within an axial distance of 10 Pipe diameters. Fully developed concentration and velocity profiles were obtained within approximately 30 Pipe diameters from the elbow exit plane. The rope behavior was different for the two elbows studied ( R / D =1.5 and 3). The shapes of the fully developed profiles were found to be independent of inlet conditions. CFD simulations of gas–solid flow through 90° circular elbows were performed using the Lagrangian approach. The simulations were used to predict the location of the rope and its dispersion rate along the Horizontal Pipe after the elbow exit plane.
Young Min Moon - One of the best experts on this subject based on the ideXlab platform.
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Off-take and Slug Transition at T-junction of Vertical-up Branch in the Horizontal Pipe
Journal of Nuclear Science and Technology, 2003Co-Authors: Young Min MoonAbstract:The off-take and the slug transition on air-water interface are experimentally investigated at the T-junction of the Horizontal Pipe with a vertical upward branch to simulate the loss-of-residual-heat-removal during a mid-loop operation in the Korea standard nuclear power plant. Scaling analysis is performed to scale down the experimental facility to the reference nuclear power plant. Two different diameters of branch Pipes are used to verify the scaling laws and their scale effects. Air is used as working gaseous fluid and no water flow exists. Off-take behavior on Horizontal stratified and slug flows is visually observed in the Horizontal Pipe. The experimental data are divided into three categories; onset of liquid entrainment at T-junction, onset of slug transition in the Horizontal Pipe, and discharge quality in the branch Pipe. It is found out that the scale effect of the branch diameter on the onset of liquid entrainment is small and the existing correlations for it are applicable. Also, the onset of slug transition shows a discrepancy with Taitel-Dukler's correlation and has a strong influence on the discharge quality. New correlations for discharge quality are developed considering the critical dependency of the onset of slugging.
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Off-take Experiment at T-junction of Vertical-Up Branch in the Horizontal Pipe
2002Co-Authors: Young Min MoonAbstract:The off-take and the liquid entrainment on air-water interface are experimentally investigated at the T-junction with a vertical upward branch to simulate the loss-of-residual-heat-removal (LORHR) during a mid-loop operation in the Korea Standard Nuclear Power Plant (KSNPP). Scaling analysis is performed to scale down the experimental facility to the reference nuclear power plan, UCN Unit 3 and 4. Two different diameters of branch Pipe use two scaling similarities to confirm the scaling law. An air is used as working fluid and no water flow exists. An off-take behavior is visually observed using transparent Pipes. Main control parameters are the water level in Horizontal Pipe and the air flow rate. The experimental results are divided into three categories; onset of liquid entrainment at T-junction, onset of slug transition in Horizontal Pipe, and discharge quality in the surge line. These results are compared with previous results related to the small-break loss-of-coolant-accident (SB-LOCA) for top-side breaks. The scale effect of branch Pipe diameters (d) is investigated: no clear dependency on the Pipe diameter. The existing correlation for the onset of liquid entrainment well predicts the present data. However, data of the onset of slug transition do not have good agreement with several existingmore » correlations. The branch quality is strongly affected by the slug transition in the Horizontal Pipe: quality suddenly drops when the transition occurs. (authors)« less
Ek Levy - One of the best experts on this subject based on the ideXlab platform.
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gas solid flow behavior in a Horizontal Pipe after a 90 vertical to Horizontal elbow
Powder Technology, 2001Co-Authors: Huseyin Akilli, Ek Levy, Beşir SahinAbstract:Abstract The characteristics of the particle flow in a Horizontal Pipe following a 90° vertical-to-Horizontal elbow were investigated both numerically and experimentally. Laboratory experiments were conducted in a 0.154 m ID test section. The effects of air velocity, the ratio of air-to-solids mass flow rate, geometry of the elbow and inlet conditions on gas–solid flow patterns were investigated experimentally. Pulverized coal with a mean particle diameter of 50 μm was used as the solid material. Experiments were performed with conveying air velocities ranging from 15 to 30 m/s and air-to-solids mass flow rate ratios of 1 and 3, with elbows having bend radius to Pipe diameter ratios of 1.5 and 3. Measurements of particle concentration and particle velocity were performed at various locations along the Horizontal Pipe using a fiber-optic probe which was traversed over the Pipe cross-section of the Pipe. It was observed that the strong rope created by the elbow disintegrates within an axial distance of 10 Pipe diameters. Fully developed concentration and velocity profiles were obtained within approximately 30 Pipe diameters from the elbow exit plane. The rope behavior was different for the two elbows studied ( R / D =1.5 and 3). The shapes of the fully developed profiles were found to be independent of inlet conditions. CFD simulations of gas–solid flow through 90° circular elbows were performed using the Lagrangian approach. The simulations were used to predict the location of the rope and its dispersion rate along the Horizontal Pipe after the elbow exit plane.
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Gas–solid flow behavior in a Horizontal Pipe after a 90° vertical-to-Horizontal elbow
Powder Technology, 2001Co-Authors: Huseyin Akilli, Ek Levy, Beşir SahinAbstract:Abstract The characteristics of the particle flow in a Horizontal Pipe following a 90° vertical-to-Horizontal elbow were investigated both numerically and experimentally. Laboratory experiments were conducted in a 0.154 m ID test section. The effects of air velocity, the ratio of air-to-solids mass flow rate, geometry of the elbow and inlet conditions on gas–solid flow patterns were investigated experimentally. Pulverized coal with a mean particle diameter of 50 μm was used as the solid material. Experiments were performed with conveying air velocities ranging from 15 to 30 m/s and air-to-solids mass flow rate ratios of 1 and 3, with elbows having bend radius to Pipe diameter ratios of 1.5 and 3. Measurements of particle concentration and particle velocity were performed at various locations along the Horizontal Pipe using a fiber-optic probe which was traversed over the Pipe cross-section of the Pipe. It was observed that the strong rope created by the elbow disintegrates within an axial distance of 10 Pipe diameters. Fully developed concentration and velocity profiles were obtained within approximately 30 Pipe diameters from the elbow exit plane. The rope behavior was different for the two elbows studied ( R / D =1.5 and 3). The shapes of the fully developed profiles were found to be independent of inlet conditions. CFD simulations of gas–solid flow through 90° circular elbows were performed using the Lagrangian approach. The simulations were used to predict the location of the rope and its dispersion rate along the Horizontal Pipe after the elbow exit plane.