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Near and intermediate field evolution of a negatively buoyant jet. Laboratory experiments and mathematical modeling

Grazioli, Jacopo LU and Noro, Davide Aldo LU (2010) In TVVR10/5016 VVR820 20101
Division of Water Resources Engineering
Abstract
The purpose of this study is to explore the behavior of a dense jet and bottom plume, composed of brine water, discharged into a receiving body of lighter fresh water. This situation is common in connection with freshwater production from sea water (desalination), which produces a brine waste stream, usually discharged into sea water.
The increasing interest in desalination processes requires investigations on how to reduce the negative impacts deriving from the brine discharge, appearing as a negatively buoyant jet. In this study a mathematical model was developed to simulate the jet and plume behavior in order to determine the optimum discharge conditions for different scenarios.
The model was divided into two sub-models, describing... (More)
The purpose of this study is to explore the behavior of a dense jet and bottom plume, composed of brine water, discharged into a receiving body of lighter fresh water. This situation is common in connection with freshwater production from sea water (desalination), which produces a brine waste stream, usually discharged into sea water.
The increasing interest in desalination processes requires investigations on how to reduce the negative impacts deriving from the brine discharge, appearing as a negatively buoyant jet. In this study a mathematical model was developed to simulate the jet and plume behavior in order to determine the optimum discharge conditions for different scenarios.
The model was divided into two sub-models, describing respectively the near and intermediate field properties of the discharge. Equations utilized are mass and momentum conservation, and several assumptions were made in order to simplify the mathematical description. The predictions of the model were compared with data collected at the Water Resources Engineering (TVRL) laboratory as well as results obtained with a commercial software simulation package (CORMIX®).
After the calibration of the main parameters, the model satisfactorily reproduced the experimental data, although the simulations are not able to adequately describe the effects of one important parameter, that is, the bottom slope. To overcome this problem separate calibrations are done with and without the bottom slope.
The main conclusions of this work are that the model produces results in acceptable agreement with data and observations, even though some improvements should be made in order to give the correct weight to the bottom slope parameter and to reduce the need for user calibration. An overall assessment of the CORMIX® software behavior cannot be made; in our case (i.e. small scale) the software was not giving simulation results that reproduced the data. (Less)
Please use this url to cite or link to this publication:
author
Grazioli, Jacopo LU and Noro, Davide Aldo LU
supervisor
organization
course
VVR820 20101
year
type
H2 - Master's Degree (Two Years)
subject
keywords
near intermediate field, Modeling, Brine waters, Cormix
publication/series
TVVR10/5016
report number
10/5016
ISSN
1101-9824
language
English
additional info
Examiner: Kenneth M. Persson
id
1668812
date added to LUP
2010-09-16 15:48:49
date last changed
2019-03-27 11:40:31
@misc{1668812,
  abstract     = {The purpose of this study is to explore the behavior of a dense jet and bottom plume, composed of brine water, discharged into a receiving body of lighter fresh water. This situation is common in connection with freshwater production from sea water (desalination), which produces a brine waste stream, usually discharged into sea water.
The increasing interest in desalination processes requires investigations on how to reduce the negative impacts deriving from the brine discharge, appearing as a negatively buoyant jet. In this study a mathematical model was developed to simulate the jet and plume behavior in order to determine the optimum discharge conditions for different scenarios.
The model was divided into two sub-models, describing respectively the near and intermediate field properties of the discharge. Equations utilized are mass and momentum conservation, and several assumptions were made in order to simplify the mathematical description. The predictions of the model were compared with data collected at the Water Resources Engineering (TVRL) laboratory as well as results obtained with a commercial software simulation package (CORMIX®).
After the calibration of the main parameters, the model satisfactorily reproduced the experimental data, although the simulations are not able to adequately describe the effects of one important parameter, that is, the bottom slope. To overcome this problem separate calibrations are done with and without the bottom slope.
The main conclusions of this work are that the model produces results in acceptable agreement with data and observations, even though some improvements should be made in order to give the correct weight to the bottom slope parameter and to reduce the need for user calibration. An overall assessment of the CORMIX® software behavior cannot be made; in our case (i.e. small scale) the software was not giving simulation results that reproduced the data.},
  author       = {Grazioli, Jacopo and Noro, Davide Aldo},
  issn         = {1101-9824},
  keyword      = {near intermediate field,Modeling,Brine waters,Cormix},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVVR10/5016},
  title        = {Near and intermediate field evolution of a negatively buoyant jet. Laboratory experiments and mathematical modeling},
  year         = {2010},
}