2013

Gordon, Kathryn; Morris, Scott; Jemcov, Aleksandar; Cameron, Joshua Investigation of the Unsteady Total Pressure Profile Corresponding to CounterRotating Vortices in an Internal Flow Application Journal Article Bulletin of the American Physical Society, 58 , 2013. Abstract  Links  BibTeX  Tags: IGV, Pressure, Vortices @article{gordon2013investigation,
title = {Investigation of the Unsteady Total Pressure Profile Corresponding to CounterRotating Vortices in an Internal Flow Application},
author = { Kathryn Gordon and Scott Morris and Aleksandar Jemcov and Joshua Cameron},
url = {http://absimage.aps.org/image/DFD13/MWS_DFD132013002195.pdf},
year = {2013},
date = {20130101},
journal = {Bulletin of the American Physical Society},
volume = {58},
publisher = {American Physical Society},
abstract = {The interaction of components in a compressible, internal flow often results in unsteady interactions between the wakes and moving blades. A prime example in which this flow feature is of interest is the interaction between the downstream rotor blades in a transonic axial compressor with the wake vortices shed from the upstream inlet guide vane (IGV). Previous work shows that a double row of counterrotating vortices convects downstream into the rotor passage as a result of the rotor blade bow shock impinging on the IGV. The rotorrelative timemean total pressure distribution has a region of high total pressure corresponding to the pathline of the vortices. The present work focuses on the relationship between the magnitude of the timemean rotorrelative total pressure profile and the axial spacing between the IGV and the rotor. A survey of different axial gap sizes is performed in a twodimensional computational study to obtain the sensitivity of the pressure profile amplitude to IGVrotor axial spacing.},
keywords = {IGV, Pressure, Vortices},
pubstate = {published},
tppubtype = {article}
}
The interaction of components in a compressible, internal flow often results in unsteady interactions between the wakes and moving blades. A prime example in which this flow feature is of interest is the interaction between the downstream rotor blades in a transonic axial compressor with the wake vortices shed from the upstream inlet guide vane (IGV). Previous work shows that a double row of counterrotating vortices convects downstream into the rotor passage as a result of the rotor blade bow shock impinging on the IGV. The rotorrelative timemean total pressure distribution has a region of high total pressure corresponding to the pathline of the vortices. The present work focuses on the relationship between the magnitude of the timemean rotorrelative total pressure profile and the axial spacing between the IGV and the rotor. A survey of different axial gap sizes is performed in a twodimensional computational study to obtain the sensitivity of the pressure profile amplitude to IGVrotor axial spacing. 
2000

Atkinson, Bruce J; Stephens, Darrin W; Harris, Jonathan A; Schneider, Phil A The net pressure driving force due to boiling in calandria tubes. Inproceedings Hogarth, DM (Ed.): Australian Society of Sugar Cane Technologists, 2000. Abstract  Links  BibTeX  Tags: Boiling, Calandria, Evaporation, Flow, Mass Flow Rate, Model, Pressure, Temperature, Thermodynamic, TwoPhase, Vacuum Pan @inproceedings{atkinson2000net,
title = {The net pressure driving force due to boiling in calandria tubes.},
author = {Bruce J Atkinson and Darrin W Stephens and Jonathan A Harris and Phil A Schneider},
editor = {DM Hogarth },
doi = {10.13140/RG.2.1.1998.5762},
year = {2000},
date = {20000101},
booktitle = {Australian Society of Sugar Cane Technologists},
journal = {Proceedings of the 2000 Conference of the Australian Society of Sugar Cane Technologists held at Bundaberg, Queensland, Australia, 2 May to 5 May 2000.},
volume = {22},
abstract = {Vapour formation due to boiling in calandria tubes provides the driving force for natural circulation in vacuums pans. The net pressure difference generated across a calandria tube is determined by the average density deficit in the tube relative to the downcomer (i.e. the amount of vapour in the tube) and the pressure loss due to friction and acceleration. This paper presents a mathematical model of the twophase flow of molasses and vapour in calandria tube assuming equilibrium thermodynamics and steady state conditions. The model can predict the net pressure driving force and the evaporation rate produced by a tube as a function of parameters such as heat input, mass flow rate, liquid height above the calandria and boiling point elevation. Additionally, the model yields detailed profiles of temperature, absolute pressure, volume fraction and other variables as a function of distance along the calandria tube. Results are presented in the form of characteristic curves representing the net pressure difference available to drive natural circulation as a function of applied heat and mass flow rate. The circulation rate and evaporation rate in natural circulation lop may be determined by matching the appropriate characteristic curve to the system response curve for the loop. An example is presented to illustrate the application of the model.},
keywords = {Boiling, Calandria, Evaporation, Flow, Mass Flow Rate, Model, Pressure, Temperature, Thermodynamic, TwoPhase, Vacuum Pan},
pubstate = {published},
tppubtype = {inproceedings}
}
Vapour formation due to boiling in calandria tubes provides the driving force for natural circulation in vacuums pans. The net pressure difference generated across a calandria tube is determined by the average density deficit in the tube relative to the downcomer (i.e. the amount of vapour in the tube) and the pressure loss due to friction and acceleration. This paper presents a mathematical model of the twophase flow of molasses and vapour in calandria tube assuming equilibrium thermodynamics and steady state conditions. The model can predict the net pressure driving force and the evaporation rate produced by a tube as a function of parameters such as heat input, mass flow rate, liquid height above the calandria and boiling point elevation. Additionally, the model yields detailed profiles of temperature, absolute pressure, volume fraction and other variables as a function of distance along the calandria tube. Results are presented in the form of characteristic curves representing the net pressure difference available to drive natural circulation as a function of applied heat and mass flow rate. The circulation rate and evaporation rate in natural circulation lop may be determined by matching the appropriate characteristic curve to the system response curve for the loop. An example is presented to illustrate the application of the model. 
1999

Stephens, Darrin W; Harris, Jonathan A Modelling convective boiling of molasses Conference 2nd International Conference on CFD in the Minerals and Processing Industries, CSIRO, Melbourne, Australia, 1999. Abstract  Links  BibTeX  Tags: Boiling, Flow, Heat Transfer, Model, Modelling, ODE, Pressure, TwoPhase @conference{stephens1999modelling,
title = {Modelling convective boiling of molasses},
author = {Darrin W Stephens and Jonathan A Harris},
doi = {10.13140/RG.2.1.2359.0242},
year = {1999},
date = {19990101},
booktitle = {2nd International Conference on CFD in the Minerals and Processing Industries, CSIRO, Melbourne, Australia},
abstract = {Oneand twodimensional numerical models of forced convective boiling of molasses in a calandria tube are described. The flow in the tube is considered to be composed of two phases (molasses and steam). The onedimensional model solves a simplified set of ODEs describing the nonequilibrium boiling process. The twodimensional model is based on the Eulerian/Eulerian multiphase approach as implemented in the CFX4.2 CFD code, and solves for the distribution of volume fraction and the temperature and velocity of each phase, along with global parameters such as pressure drop and evaporation rate. Solutions are presented for a case with similar conditions to those expected in a batch vacuum pan. The results show that the flow in the tube is complex and multidimensional. Vapour forms both at the wall (due to direct heating) as well as in the centre (due to bulk boiling). The observed features of the flow from the numerical simulation are qualitatively similar to available experimental observations made by previous investigators, although quantitative agreement has yet to be achieved.},
keywords = {Boiling, Flow, Heat Transfer, Model, Modelling, ODE, Pressure, TwoPhase},
pubstate = {published},
tppubtype = {conference}
}
Oneand twodimensional numerical models of forced convective boiling of molasses in a calandria tube are described. The flow in the tube is considered to be composed of two phases (molasses and steam). The onedimensional model solves a simplified set of ODEs describing the nonequilibrium boiling process. The twodimensional model is based on the Eulerian/Eulerian multiphase approach as implemented in the CFX4.2 CFD code, and solves for the distribution of volume fraction and the temperature and velocity of each phase, along with global parameters such as pressure drop and evaporation rate. Solutions are presented for a case with similar conditions to those expected in a batch vacuum pan. The results show that the flow in the tube is complex and multidimensional. Vapour forms both at the wall (due to direct heating) as well as in the centre (due to bulk boiling). The observed features of the flow from the numerical simulation are qualitatively similar to available experimental observations made by previous investigators, although quantitative agreement has yet to be achieved. 
1996

Jemcov, Aleksandar; Matovic, Darko Wavelet Preconditioner for Pressure Equation in Domain Decomposition Inproceedings CFD96 Conference, CFD Society of Canada, CFD Society of Canada 1996. Links  BibTeX  Tags: Decomposition, Preconditioner, Pressure, Wavelet @inproceedings{jemcov1996wavelet,
title = {Wavelet Preconditioner for Pressure Equation in Domain Decomposition},
author = { Aleksandar Jemcov and Darko Matovic},
url = {https://www.researchgate.net/publication/265160953_Wavelet_Preconditioner_for_Pressure_Equaiton_in_Domain_Decomposition},
year = {1996},
date = {19960101},
booktitle = {CFD96 Conference, CFD Society of Canada},
organization = {CFD Society of Canada},
keywords = {Decomposition, Preconditioner, Pressure, Wavelet},
pubstate = {published},
tppubtype = {inproceedings}
}
