| dc.contributor |
Best , Frederick R . |
|
| dc.creator |
Ghrist , Melissa Renee |
|
| dc.date |
2010 -01 -15T00 :04 :15Z |
|
| dc.date |
2010 -01 -16T00 :28 :48Z |
|
| dc.date |
2010 -01 -15T00 :04 :15Z |
|
| dc.date |
2010 -01 -16T00 :28 :48Z |
|
| dc.date |
2008 -12 |
|
| dc.date |
2009 -05 -15 |
|
| dc.date.accessioned |
2013 -03 -12T17 :49 :48Z |
|
| dc.date.available |
2013 -03 -12T17 :49 :48Z |
|
| dc.date.issued |
2013 -03 -12 |
|
| dc.identifier |
http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2353 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2353 |
|
| dc.description |
This thesis compares air /water two -phase flow regime transition models in zero
gravity with data and makes recommendations for zero gravity models to incorporate
into the RELAP5 -3D thermal hydraulic computer code . Data from numerous
researchers and experiments are compiled into a large database . A RELAP5 -3D model
is built to replicate the zero gravity experiments , and flow regime results from the
RELAP5 -3D code are compared with data . The comparison demonstrates that the
current flow regime maps used in the computer code do not scale to zero gravity . A new
flow regime map is needed for zero gravity conditions .
Three bubbly -to -slug transition models and four slug -to -annular transition
models are analyzed and compared with the data . A mathematical method is developed
using least squares to objectively compare the accuracy of the models with the data . The
models are graded by how well each represents the data . Agreement with data validates
the recommendations made for changes to the RELAP5 -3D computer code models . For
smaller diameter tubes , Dukler’s bubbly -to -slug model best fits the data . For the larger tubes , the Drift Flux model is a better fit . The slug -to -annular transition is modeled best
by Creare for small tubes and Reinarts for larger tubes .
A major finding of this thesis work is that more air /water data is needed at
equally distributed flow velocities and a greater variety of tube diameters . More data is
specifically needed in the predicted transition regions made in this study . |
|
| dc.format |
electronic |
|
| dc.format |
application /pdf |
|
| dc.format |
born digital |
|
| dc.language |
en _US |
|
| dc.subject |
Flow regime |
|
| dc.subject |
RELAP5 -3D |
|
| dc.subject |
Zero Gravity |
|
| dc.title |
Zero gravity two -phase flow regime transition modeling compared with data and relap5 -3d predictions |
|
| dc.type |
Book |
|
| dc.type |
Thesis |
|
| dc.type |
Electronic Thesis |
|
| dc.type |
text |
|