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- Title
Modeling Convection Boundary Conditions for Ultra-High- Performance Concrete in Cylindrical Columns.
- Authors
Carey, Ashley S.; Howard, Isaac L.; Knizley, Alta; Shannon, Jay
- Abstract
In this paper, a numerical model for radial-direction conduction through ultra-high-performance concrete (UHPC) cylinders was developed and experimentally validated. The focus of this research is ultimately to improve understanding of UHPC's thermal behavior, with this portion focused on determining a convection heat-transfer coefficient for appropriate boundary condition modeling. Although constant heat-transfer coefficients are commonly assumed in literature, this paper shows that many commonly assumed constant coefficients overestimate convection performance for natural convection boundary condition environments. For well-studied geometries, numerical solutions including a temperature and time-dependent convection coefficient produced errors under 1%, whereas constant heat-transfer coefficient assumptions produced errors up to 10%. However, for less-common geometries, numerical model errors ranged from 2 to 5%.
- Subjects
CONCRETE columns; NATURAL heat convection; GEOGRAPHIC boundaries; RAYLEIGH number
- Publication
ACI Materials Journal, 2020, Vol 117, Issue 3, p123
- ISSN
0889-325X
- Publication type
Article
- DOI
10.14359/51724595