Details
| Original language | English |
|---|---|
| Pages (from-to) | 41-57 |
| Number of pages | 17 |
| Journal | Journal of hydrology |
| Volume | 400 |
| Issue number | 1-2 |
| Early online date | 3 Feb 2011 |
| Publication status | Published - 30 Mar 2011 |
Abstract
The HydroGeoSphere model is further developed and used to investigate the effects of viscosity, capillarity and grid spacing on thermal variable-density flow. Under saturated and unsaturated flow conditions, the flow dynamics significantly depends on the viscosity assumption (constant vs. variable), where downwelling regions (constant viscosity) become upwelling regions (temperature-dependent variable viscosity). Capillarity does not change the location of downwelling and upwelling regions. Capillarity can significantly alter the flow dynamics in the way that the water table acts as a " lid" to flow, and it diverts a thermal plume laterally. Significance of capillarity increases with increasing soil moisture. Thermal convective flow is highly sensitive to spatial discretization. While the flow dynamics remains to be a function of grid level, spatial discretization Δ. x=Δ z= 1 m appears to be appropriate to simulate unsaturated variable-density flow and heat transfer in porous media because estimated errors have asymptotically reached a minimum.
Keywords
- Capillarity, Density, Elder problem, Heat flow, Unsaturated, Viscosity
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
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In: Journal of hydrology, Vol. 400, No. 1-2, 30.03.2011, p. 41-57.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of viscosity, capillarity and grid spacing on thermal variable-density flow
AU - Graf, Thomas
AU - Boufadel, Michel C.
PY - 2011/3/30
Y1 - 2011/3/30
N2 - The HydroGeoSphere model is further developed and used to investigate the effects of viscosity, capillarity and grid spacing on thermal variable-density flow. Under saturated and unsaturated flow conditions, the flow dynamics significantly depends on the viscosity assumption (constant vs. variable), where downwelling regions (constant viscosity) become upwelling regions (temperature-dependent variable viscosity). Capillarity does not change the location of downwelling and upwelling regions. Capillarity can significantly alter the flow dynamics in the way that the water table acts as a " lid" to flow, and it diverts a thermal plume laterally. Significance of capillarity increases with increasing soil moisture. Thermal convective flow is highly sensitive to spatial discretization. While the flow dynamics remains to be a function of grid level, spatial discretization Δ. x=Δ z= 1 m appears to be appropriate to simulate unsaturated variable-density flow and heat transfer in porous media because estimated errors have asymptotically reached a minimum.
AB - The HydroGeoSphere model is further developed and used to investigate the effects of viscosity, capillarity and grid spacing on thermal variable-density flow. Under saturated and unsaturated flow conditions, the flow dynamics significantly depends on the viscosity assumption (constant vs. variable), where downwelling regions (constant viscosity) become upwelling regions (temperature-dependent variable viscosity). Capillarity does not change the location of downwelling and upwelling regions. Capillarity can significantly alter the flow dynamics in the way that the water table acts as a " lid" to flow, and it diverts a thermal plume laterally. Significance of capillarity increases with increasing soil moisture. Thermal convective flow is highly sensitive to spatial discretization. While the flow dynamics remains to be a function of grid level, spatial discretization Δ. x=Δ z= 1 m appears to be appropriate to simulate unsaturated variable-density flow and heat transfer in porous media because estimated errors have asymptotically reached a minimum.
KW - Capillarity
KW - Density
KW - Elder problem
KW - Heat flow
KW - Unsaturated
KW - Viscosity
UR - http://www.scopus.com/inward/record.url?scp=79952487222&partnerID=8YFLogxK
U2 - 10.1016/j.jhydrol.2011.01.025
DO - 10.1016/j.jhydrol.2011.01.025
M3 - Article
AN - SCOPUS:79952487222
VL - 400
SP - 41
EP - 57
JO - Journal of hydrology
JF - Journal of hydrology
SN - 0022-1694
IS - 1-2
ER -