Starting laminar plumes: Comparison of laboratory and numerical modeling
| Autor: | J. Vatteville, Angela Limare, Peter E. van Keken, Anne Davaille |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
010504 meteorology & atmospheric sciences
Computer simulation Field (physics) Meteorology Laminar flow Mechanics 010502 geochemistry & geophysics 01 natural sciences Finite element method Plume Physics::Fluid Dynamics Viscosity Geophysics Particle image velocimetry 13. Climate action Geochemistry and Petrology Vector field Geology 0105 earth and related environmental sciences |
| Zdroj: | Geochemistry, Geophysics, Geosystems. 10 |
| ISSN: | 1525-2027 |
| DOI: | 10.1029/2009gc002739 |
| Popis: | A detailed comparison of starting laminar plumes in viscous fluids is provided using the complementary approaches of laboratory modeling and numerical simulation. In the laboratory experiments the plumes are started in a nearly isoviscous silicone oil with heat supplied through a fixed circular source. The temperature field is measured by differential interferometry and thermochromic liquid crystals. The velocity field is determined by particle image velocimetry. Numerical simulations of the laboratory experiments are performed using a finite element method that employs the measured properties of the physical oil and the heating history. No further adjustments are made to match the laboratory results. For fluids at two different viscosities and for variable power supplied to the plume there is excellent agreement in the temporal evolution and fine spatial detail of the plume. Minor differences remain, particulary in the transient stage of the plume in the low-viscosity fluid, but the differences are within the experimental uncertainties. In contrast, the assumption of constant viscosity in the numerical models leads to differences that are larger than the experimental uncertainties, demonstrating that these near-isoviscous fluids should not be considered to have constant viscosity. |
| Databáze: | OpenAIRE |
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