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A Computational Model for Coal Transport and Combustion. Quarterly Technical Progress Report, September 1, 1993--November 30, 1993

Description: In the period of September 1, 1993 to November 30, 1993, further progress was made of the theoretical and computational modeling of turbulent two-phase flows, as well as granular flows. The effect of bumpy wall on flow of granular materials was also analyzed. The special case of Couette flow was studied. Further progress was made in the experimental study of mono-layer simple shear flow device. Preliminary data concerning the sharing of 12 mm multi-color glass particles are obtained. The prelim… more
Date: Winter 1993
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, June 1, 1992--August 31, 1992

Description: Further progress has been made in formulation of the thermodynamically consistent, rate dependent model for turbulent two-phase flows. The thermodynamically admissible constitutive equations were derived, and the case of a simple shear flow was studied. The kinetic model for rapid flows of granular materials, which includes frictional losses, was used for studying gravity flow down an inclined chute. Some typical velocity profiles were obtained and the results were compared with the data of Sav… more
Date: October 1992
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, December 1, 1991--February 28, 1992

Description: In the period of December 1, 1991 to February 28, 1992 further progress has been made in formulation of the thermodynamically consistent rate dependent model for turbulent two-phase flows. The thermodynamically admissible constitutive equations were derived, and the case of a simple shear flow was also studied. A stress transport model for rapid granular flows in a rotating frame of reference was formulated. The thermodynamically consistent constitutive equations were derived. It was shown that… more
Date: May 1992
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, September 1, 1992--November 30, 1992

Description: The thermodynamically consistent, rate dependent model for turbulent two-phase flows was used to study the special case of a simple shear. The variations of the fluctuation kinetic energy with the solid volume fraction was evaluated. The kinetic model for rapid flows of granular materials, which includes frictional losses, was used for studying gravity flow down an inclined chute. The velocity profiles were obtained and the results were compared with the data of Johnson et al. The effect of dia… more
Date: Winter 1992
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, June 1, 1993--August 31, 1993

Description: The objective of this project is to develop an accurate model describing turbulent flows of coal slurries, rapid flows of granular coal-air mixtures, and turbulent coal combustion processes. The other main objective is to develop a computer code incorporating the new model. Experimental verification of the foundation of the model is also included in the study. In this report the thermodynamically consistent, rate dependent model for turbulent two-phase flows analysis was used and the phasic flu… more
Date: Autumn 1993
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, March 1, 1993--May 31, 1993

Description: The objective of this project is to develop an accurate model describing turbulent flows of coal slurries, rapid flows of granular coal-air mixtures, and turbulent coal combustion processes. The other main objective is to develop a computer code incorporating the new model. Experimental verification of the foundation of the model is also included in the study. Progress was made in the experimental study of monolayer simple shear flow device. Preliminary data concerning the shearing of 12 mm mul… more
Date: September 1993
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, March 1, 1994--May 31, 1994

Description: In the period of March 1, 1994 to May 31, 1994, the earlier developed computational models for analyzing flow of granular materials in ducts and passages with bumpy walls were used to analyze Couette and chute flows. The results were compared with the experimental data and good agreement was observed. Further results on the flows of gas-solid mixtures in vertical ducts were obtained. A computational model for analyzing two-phase flow was developed, and the phasic mean velocity and fluctuation e… more
Date: August 1994
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, September 1, 1994--November 30, 1994

Description: In the period of September 1, 1994 to November 30, 1994, further progress was made in the analysis of granular materials in ducts and passages with bumpy walls. The analysis of gravity chute flows was completed. Additional results on flows of gas-solid mixtures in vertical ducts were obtained. The results were compared with the experimental data of Tsuji an co-worker and Miller and Gidaspow and good agreement was obtained. The computational model was used to study two-phase flows in a horizonta… more
Date: April 1995
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, September 1--November 30, 1991

Description: During the last three months, considerable progress has been made in formulation of the thermodynamically consistent rate dependent model for turbulent two-phase flows. The basic governing equations were derived and the case of a simple shear flow was also analyzed. Preliminary comparisons with the available experimental data were also performed. The thermodynamical approach was successfully formulated for developing a stress transport model for granular flows. The appropriate constitutive equa… more
Date: Winter 1991
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Computational Model for Coal Transport and Combustion. Quarterly Technical Progress Report, December 1, 1992--February 28, 1993

Description: In the period of December 1, 1992 to February 28, 1993, further progress was made in using the thermodynamically consistent, rate dependent model for turbulent two-phase flows analysis. The effect of particle Reynolds number on variations of the fluctuation kinetic energy with the solid volume fraction for the special case of a simple shear flow was analyzed. Additional results for the application of the kinetic model for rapid flows of granular materials, which includes frictional losses were … more
Date: May 1993
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, December 1, 1993--February 28, 1994

Description: In the period of December 1, 1993 to February 28, 1994, considerable progress in the experimental study of monogranular layer simple shear flow device was made. Experimental data concerning the mean granular velocity, fluctuation velocity and solid volume fraction were obtained. The resulting data revealed new interesting features of particulate flows. The thermodynamically consistent, rate dependent model for turbulent two-phase flows and its application to analysis of simple shear flow was co… more
Date: June 1994
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A computational model for coal transport and combustion. Quarterly technical progress report, March 1, 1992--May 31, 1992

Description: In the period of March 1, 1992 to May 30, 1992 considerable progress has been made in the development of the stress transport model for rapid granular flows in a rotating frame of reference. The derivation of thermodynamically consistent constitutive equations were complete. It was shown that the model contains the existing kinetics theories as special limiting cases. The model predictions for the special case of rapid simple shear flows were evaluated and the results are compared with the simu… more
Date: June 2, 1992
Creator: Ahmadi, Goodarz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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