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Book On Surface Dilution of Submerged Buoyant Jets with Bottom Interference Jets Discharging Horizontally Into Stagnant Uniform Density Environment

Download or read book On Surface Dilution of Submerged Buoyant Jets with Bottom Interference Jets Discharging Horizontally Into Stagnant Uniform Density Environment written by Ju H. Bong and published by . This book was released on 1972 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book An Experimental analytical Investigation of Deep Submerged Multiple Buoyant Jets

Download or read book An Experimental analytical Investigation of Deep Submerged Multiple Buoyant Jets written by L. D. Kannberg and published by . This book was released on 1976 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Book Negatively Buoyant Jets in a Cross Flow

Download or read book Negatively Buoyant Jets in a Cross Flow written by Jerry Lee Anderson and published by . This book was released on 1973 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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.

Book A Study of Submerged and Surface Horizontal Buoyant Jets

Download or read book A Study of Submerged and Surface Horizontal Buoyant Jets written by Atambir Singh Rao and published by . This book was released on 1976 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Mixing of Horizontal Buoyant Surface Jet Over Sloping Bottom

Download or read book Mixing of Horizontal Buoyant Surface Jet Over Sloping Bottom written by Bijan Safaie Khoram Daroudi and published by . This book was released on 1978 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Jet Diffusion in Stagnant Ambient Fluid

Download or read book Jet Diffusion in Stagnant Ambient Fluid written by G. Abraham and published by . This book was released on 1963 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Discharge Characteristics of Submerged Jets

Download or read book Discharge Characteristics of Submerged Jets written by Maurice Joseph Zucrow and published by . This book was released on 1928 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Buoyant Surface Jets Discharged Into a Strong Crossflow

Download or read book Buoyant Surface Jets Discharged Into a Strong Crossflow written by Chi-Yu Lin and published by . This book was released on 1977 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Discharge of a Submerged Buoyant Jet Into a Stratified Environment

Download or read book The Discharge of a Submerged Buoyant Jet Into a Stratified Environment written by To-Hing Tong and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Mixing of Horizontal Buoyant Surface Jet Over Slopping Bottom

Download or read book Mixing of Horizontal Buoyant Surface Jet Over Slopping Bottom written by B. Safaie and published by . This book was released on 1978 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Mixing and Deposition of Sediment Laden Buoyant Jets

Download or read book Mixing and Deposition of Sediment Laden Buoyant Jets written by Shu-Ning Chan and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Mixing and Deposition of Sediment-laden Buoyant Jets" by Shu-ning, Chan, 陳樹寧, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Sediment-laden turbulent buoyant jets are commonly encountered in the natural and man-made environments. Examples of sediment-laden buoyant jets include volcanic eruptions, deep ocean hydrothermal vents ("black smokers"), ocean dumping of dredged spoils and sludge, and submarine discharge of wastewater effluent. It is important to understand the fluid mechanics of sediment jets for environmental impact assessment, and yet there is currently no general model for predicting the mixing of sediment-laden jets. This study reports a theoretical and experimental investigation the sediment mixing, fall-out and deposition from sediment-laden buoyant jets. It is well known that turbulence generates fluctuations to the particle motion, modulating the particle settling velocity. A general three-dimensional (3D) stochastic particle tracking model is developed to predict the particle settling out and deposition from a sediment-laden jet. Particle velocity fluctuations are modelled by a Lagrangian velocity autocorrelation function that accounts for the loitering and trapping of sediment particles in turbulent eddies which results in the reduction of settling velocity. The model is validated against results of independent experimental studies. Consistent with basic experiments using grid-generated turbulence, the model predicts that the apparent settling velocity can be reduced by as much as 30% of the stillwater settling velocity. The mixing and deposition of sediment-laden horizontal momentum jets are studied using laboratory experiments and 3D computational fluid dynamics (CFD) modelling. It is shown that there is a significant settling velocity reduction up to about 25-35%, dependent on jet turbulent fluctuations and particle properties. The CFD approach necessitates an ad hoc adjustment/reduction on settling velocity and lacks generality. Using classical solutions of mean velocity, and turbulent fluctuation and dissipation rate profiles derived from CFD solutions, 3D particle tracking model predictions of sediment deposition and concentration profiles are in excellent agreement with measured data over a wide range of jet flow and particle properties. Unlike CFD calculations, the present method does not require any a priori adjustment of particle settling velocity. A general particle tracking model for predicting sediment fall-out and deposition from an arbitrarily inclined buoyant jets in stagnant ambient is successfully developed. The model incorporates the three flow regimes affecting the sediment dynamics in a buoyant jet, namely turbulent jet flow, jet entrainment-induced external flow and surface spreading current. The jet mean flow velocity is determined using a well-validated jet integral model. The external jet-induced irrotational flow field is computed by a distribution of point sinks along the jet trajectory. The surface spreading current is predicted using an integral model accounting for the interfacial shear. The model is validated against experimental data of sediment deposition from vertical and horizontal sediment-laden buoyant jets. DOI: 10.5353/th_b5060572 Subjects: Sediment transport - Mathematical models Suspended sediments - Mathematical models Waste disposal in the ocean - Mathematical models Jets - Fluid dynamics

Book Diffusion in Submerged Circular Vertical Turbulent Water Jets with Density Difference Between the Jet and the Surrounding Water

Download or read book Diffusion in Submerged Circular Vertical Turbulent Water Jets with Density Difference Between the Jet and the Surrounding Water written by Gerrit Abraham and published by . This book was released on 1959 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: