Model Study of the Heat Field and Liftoff Characteristics of Thermal Plumes with Different Densimetric Froude Numbers PDF Download
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Author: Robert G. Kloepper
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Category : Hydraulic models
Languages : en
Pages : 130
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Author: Robert G. Kloepper
Publisher:
ISBN:
Category : Hydraulic models
Languages : en
Pages : 130
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Author: William E. Dunn
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ISBN:
Category : Thermal pollution of rivers, lakes, etc
Languages : en
Pages : 430
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Author:
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Category : Cooling water
Languages : en
Pages : 114
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Author: Mostafa A. Shirazi
Publisher:
ISBN:
Category : Thermal pollution of rivers, lakes, etc
Languages : en
Pages : 452
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Author: Mostafa A. Shirazi
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ISBN:
Category : Thermal pollution of rivers, lakes, etc
Languages : en
Pages : 452
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Author: Mostafa A. Shirazi
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ISBN:
Category : Environmental protection
Languages : en
Pages : 450
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Author:
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Category : Coastal zone management
Languages : en
Pages : 416
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Author: Ying Wang
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Category :
Languages : en
Pages : 0
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This work presents a numerical investigation of a confined thermal plume under the influence of gas radiation. Plumeflow is generated by a linear heat source of constant power density immersed in a cubic cavity. The main aim of this thesis is to characterize the evolution of the plume throughout its transition from steady-state to turbulent regime, and to explore the gas radiation effects on flow stability, heat transfers, thermal and kinetic fields of the plume. DNS numerical simulations are performed over a Rayleigh number range from 106 to 109 by applying a finite volume CFD software coupled to a module for radiative heat transfer calculations. The pure convective situation is studied first to characterize the thermal and kinetic fields of the plume in different flow regimes. Next, the convection-radiation coupling is introduced by considering either gray gas or real gas (air - H2O mixture) media. The effects of optical thickness are analyzed in details for gray gas model. Results show that gas radiation stabilizes the plume flow and delays the onset of unsteadiness. Gas radiation also homogenizes the thermal field and reduces its spatial spreading. However, radiation effect on the kinetic field depends on the flow state. For steady state, gas radiation decreases the global flow circulation while for transient and turbulent states, it enhances the flow dynamics in optically thin medium.These general trends of radiation are also confirmed in real gas mixture through a parametric study of water vapor concentration and reference temperature.
Author:
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Category :
Languages : en
Pages :
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This report evaluates mathematical models that may be used to predict the flow and temperature distributions resulting from heated surface discharges from power-plant outfalls. Part One discusses the basic physics of surface-plume dispersion and provides a critical review of 11 of the most popular and promising plume models developed to predict the near- and complete-field plume. The principal conclusion of the report is that the available models, in their present stage of development, may be used to give only general estimates of plume characteristics; precise predictions are not currently possible. The Shirazi-Davis and Pritchard (No. 1) models appear superior to the others tested and are capable of correctly predicting general plume characteristics. (The predictions show roughly factor-of-two accuracy in centerline distance to a given isotherm, factor-of-two accuracy in plume width, and factor-of-five accuracy in isotherm areas.) The state of the art can best be improved by pursuing basic laboratory studies of plume dispersion along with further development of numerical-modeling techniques.
Author: J. M. Kuhlman
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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