Experimental Investigation Of Merging Buoyant Jets In A Crossflow
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Experimental Investigation Of Merging Buoyant Jets In A Crossflow
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Author : Miroslav Gregorič
language : en
Publisher:
Release Date : 1978
Experimental Investigation Of Merging Buoyant Jets In A Crossflow written by Miroslav Gregorič and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Jets categories.
An Experimental Analytical Investigation Of Buoyant Jets In Shallow Water
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Author : Entsung Hsiao
language : en
Publisher:
Release Date : 1990
An Experimental Analytical Investigation Of Buoyant Jets In Shallow Water written by Entsung Hsiao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Jets categories.
This thesis presents the results of an experimental and analytical study of single-port buoyant turbulent jets discharged into shallow water. The experimental results include the measured downstream dilution, centerline concentration and trajectory. Independent parameters considered were Froude number, submerged depth, discharge angle and velocity ratio. Results indicate that decreasing the discharge depth provides earlier occurrence of surface effect and greatly decreases dilution. Dilution increases with decreasing Froude number. Increasing the discharge angle from the horizontal into cross current increases the dilution ratio. The effect of ambient current on dilution depends on the angle of discharge. For cross-flow discharges, the dilution rate decreases with increasing ambient current, while for co-flow discharge the reverse trend was observed. As plumes reach the water surface, the dilution rate increases with increasing ambient velocity. The jets bend over rapidly for cross-flow discharges when large ambient currents are present. The analytical portion of this report presents an integral method proposed by Davis (1975) for merging multiple buoyant jets. This merging model was used to simulate the single-port buoyant jet in shallow water. This was done by using an image method where the submerged depth was simulated by the spacing between images. The entrainment function as presented by Kannberg and Davis (1978) was used except for a modification within the zone of merged plumes. Comparisons of the model prediction were made with experimental data. Results indicate that good predictions are obtained for buoyant jets discharging at 0 and 45 degrees into shallow water by using the image method as long as the Froude number is above 13.5. For lower Froude number and vertical discharges, model predictions are only fair.
An Experimental Analytical Investigation Of Deep Submerged Multiple Buoyant Jets
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Author : L. D. Kannberg
language : en
Publisher:
Release Date : 1976
An Experimental Analytical Investigation Of Deep Submerged Multiple Buoyant Jets written by L. D. Kannberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Buoyant ascent (Hydrodynamics) categories.
An Experimental Study Of Two Dimensional Buoyant Jets In Cross Flow
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Author : Hiroyuki Haniu
language : en
Publisher:
Release Date : 1979
An Experimental Study Of Two Dimensional Buoyant Jets In Cross Flow written by Hiroyuki Haniu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Jets categories.
Experiments And Analysis Of Merging Diffuser Plumes In Crossflow
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Author : Chun-Yen Li
language : en
Publisher:
Release Date : 1997
Experiments And Analysis Of Merging Diffuser Plumes In Crossflow written by Chun-Yen Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
An Experimental Study Of Single And Multiple Turbulent Buoyant Jets In Crossflow
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Author :
language : en
Publisher:
Release Date : 1984
An Experimental Study Of Single And Multiple Turbulent Buoyant Jets In Crossflow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
An Experimental Analytical Investigation Of Deep Submerged Multiple Buoyant Jets
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Author : L. D. Kannberg
language : en
Publisher:
Release Date : 1976
An Experimental Analytical Investigation Of Deep Submerged Multiple Buoyant Jets written by L. D. Kannberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Electric power-plants categories.
The results of an experimental and analytical study of deep submerged multiple-port thermal discharges are presented. The experimental results include the measured downstream thermal dilution, width, and centerline trajectory of the buoyant thermal plume from multiport jets. Independent parameters for which measurements were obtained include port spacing, discharge Froude Number, discharge angle, and discharge to ambient velocity ratio. Results indicate that decreasing port spacing greatly decreases thermal dilution. Changing port spacing will also affect trajectory to a small extent while only slightly changing plume width. Altering the Froude Number appears to have little effect on downstream dilution, width, or trajectory when an ambient current is present. By increasing discharge angle from the horizontal, greater initial dilution may be obtained as well as greater widths and higher trajectories. The effect of ambient current on dilution depends on the angle of discharge. For crossflow discharges the thermal dilution at any point downstream decreased with increasing ambient current, while for co-flow the reverse was observed. The jets were bent over rapidly for crossflow discharges particularly when large ambient currents were present. The analytical portion of this report employs the lumped differential model of Hirst as modified for merging multiple jets by Davis. The essential features of the analysis are: 1) the gradual transition of the profiles from simple axisymmetric profiles to merging profiles and finally to fully merged, pseudoslot, two-dimensional profiles, and 2) an entrainment based on the available entrainment surface. Results indicate that the overprediction of plume characteristics associated with "transition" or "equivalent slot" models may be overcome using such an analysis and that suitable prediction may be obtained
Negatively Buoyant Jets In A Cross Flow
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Author : Jerry Lee Anderson
language : en
Publisher:
Release Date : 1973
Negatively Buoyant Jets In A Cross Flow written by Jerry Lee Anderson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Thermal pollution of rivers, lakes, etc categories.
"Negatively buoyant jets, or sinking jets, can be observed in many problems of pollutant discharge. Any chemical waste that is heavier than the receiving water into which it is discharged may act as a negatively buoyant jet. In addition, when water is taken from the hypolimnion of a deep lake or reservoir and used as cooling water, the temperature, and consequently, the discharge may behave like a negatively buoyant jet. Two existing jet diffusion models have been utilized to predict the trajectory and dilution of a positively buoyant jet, or a rising jet, and have been modified to account for the sinking effect. Twenty-four experimental investigations were conducted involving different combinations of densimetric Froude number, velocity ratios, and initial angle of discharge. Salt was used as the tracer, yielding a fluid that was denser than the ambient receiving water and facilitated measuring concentration profiles of the jet plume. The coefficient of entrainment, the major mechanism of dilution, was determined as a function of the densimetric Froude number, velocity ratio, and initial angle of discharge. The reducted drag coefficient was chosen as zero for both models since any other value would predict a trajectory whose rise would be less than experimentally observed. For all angles of discharge the entrainment coefficient increased with a decrease in the velocity ratio and with an increase in densimetric Froude number. Additionally, there was a marked decrease in the entrainmnet coefficient with a decrease in the initial angle of discharge."--Page ii.
Experimental Investigation On Unidirectional Multiport Diffuser Discharges In Coflowing Deep Water
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Author : María Margarita Méndez-Díaz
language : en
Publisher:
Release Date : 1992
Experimental Investigation On Unidirectional Multiport Diffuser Discharges In Coflowing Deep Water written by María Margarita Méndez-Díaz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
The Entrainment And Mixing Of A Round Buoyant Turbulent Jet In Cross Flow
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Author : David Charles Thoman (Jr)
language : en
Publisher:
Release Date : 1991
The Entrainment And Mixing Of A Round Buoyant Turbulent Jet In Cross Flow written by David Charles Thoman (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
This thesis summaries the results of an experimental investigation of the near-field behavior and physics of the round buoyant turbulent jet in crossflow. In particular, the study centers on the physics associated with entrainment and mixing phenomena of the jet with the goal of better understanding the trends of trajectory and dilution behavior. The experiments involved a downward discharge of cold nitrogen gas (at about $-$85$spcirc$C) from a cylindrical structure placed in a wind tunnel of horizontally flowing ambient air. The jet was mapped using thermocouple measurements. For the purpose of studying jet/crossflow and jet/wake interactions, fog-oil smoke was used to mark parcels of fluid in the crossflow upstream of the jet and in the wake flow downstream of the discharge structure. Time-averaged, smoke concentrations were gathered through an aspirated sampling probe in conjunction with a calibrated, optical aerosol monitor. Smoke distributions were also photographed. Experiments were performed for four different values for the crossflow-to-exit velocity ratio k, namely, k = 0.7, 1.3, 2.1, and 3.5. The results of the experiments yield a comprehensive picture of the near-field flow patterns, flow interactions, and flow-transport physics for a buoyant jet in crossflow. Key, phenomenologically distinct zones of flow which comprise the near-exit structure of the jet are identified. The flow patterns within these zones, and thus the structure of the near-exit jet, are found to be extremely dependent on the value of the velocity ratio. Flow interactions in this region establish flow patterns which have a pronounced influence on the downstream development of the jet. A method is developed to fully document the trajectory and dilution behavior of the jet with the key parameters of influence. Trajectory and dilution are found to correlate with two parameters, namely, the velocity ratio and the density-difference ratio. Finally, unsteady, large-scale mixing motions within the near-exit flow zones are documented. Distinct modes of large-scale mixing which are responsible for the rapid and extensive dispersion observed in the jet are revealed by this study.
