The effect of temperature on capillary pressure‐saturation relationships for air‐water and perchloroethylene‐water systems

The temperature dependence of capillary pressure‐saturation relationships was measured for air‐water and perchloroethylene‐water systems in silica sand. Changes in capillary pressures, irreducible water phase saturations, and residual nonwetting saturations with temperature were determined. Relationships for temperature dependence of contact angle and interfacial tension were incorporated into the van Genuchten [1980] model and fitted to the data. Capillary pressures at constant degrees of saturation decreased as temperature increased. Hysteresis decreased, irreducible water saturations increased, and residual nonwetting saturations decreased as temperature increased. The magnitude of the change in capillary pressures could not be explained by the temperature dependence of wetting‐nonwetting interfacial tensions alone. Derived parameters for the temperature dependence of the contact angle predicted an increase of contact angle of roughly 45°–50° for air‐water and perchloroethylene systems with a temperature increase from 20° to 80°C, while literature studies suggest that contact angles should decrease with increasing temperature. It was concluded that the parametric relationship for temperature effects incorporated into the van Genuchten [1980] model fit the data well, but other effects in addition to changes in interfacial tension and contact angle played a role in the temperature dependence of capillary pressure‐saturation relationships.

[1]  B. Sleep,et al.  Thermal variation of organic fluid properties and impact on thermal remediation feasibility , 1997 .

[2]  Hugh Y. She.  Laboratory evaluation of in situ steam flushing for NAPL removal from soil , 1997 .

[3]  A. Salehzadeh,et al.  Calculation of Temperature Effects on Wetting Coefficients of Porous Solids and Their Capillary Pressure Functions , 1996 .

[4]  F. Leij,et al.  Wettability effects on scaling two- and three-fluid capillary pressure-saturation relations. , 1995, Environmental science & technology.

[5]  E. Davis.  Effect of temperature and pore size on the hydraulic properties and flow of a hydrocarbon oil in the subsurface , 1994 .

[6]  J. H. Dane,et al.  Reconciliation between Measured and Theoretical Temperature Effects on Soil Water Retention Curves , 1993 .

[7]  J. Constantz.  Comparison of Isothermal and Isobaric Water Retention Paths in Nonswelling Porous Materials , 1991 .

[8]  P. Taylor,et al.  Physical chemistry of surfaces , 1991 .

[9]  Avery H. Demond,et al.  Effect of interfacial forces on two-phase capillary pressure-saturation relationships , 1991 .

[10]  W. M. Haynes.  CRC Handbook of Chemistry and Physics , 1990 .

[11]  Kent S. Udell,et al.  Nonaqueous phase liquid transport and cleanup: 1. Analysis of mechanisms , 1988 .

[12]  Jack C. Parker,et al.  A model for hysteretic constitutive relations governing multiphase flow: 1. Saturation-pressure relations , 1987 .

[13]  W. Press,et al.  Numerical recipes in C. The art of scientific computing , 1987 .

[14]  E. E. Miller,et al.  The temperature dependence of isothermal moisture vs. potential characteristics of soils. , 1986 .

[15]  J. H. Dane,et al.  Temperature Dependence of Soil Water Retention Curves , 1986 .

[16]  J. W. Mercer,et al.  Role of the unsaturated zone in radioactive and hazardous waste disposal , 1983 .

[17]  Van Genuchten,et al.  A closed-form equation for predicting the hydraulic conductivity of unsaturated soils , 1980 .

[18]  A. Khalil.  Thermal treatment of nonporous silica , 1978 .

[19]  J. Bear.  Dynamics of Fluids in Porous Media , 1975 .

[20]  R. D. Jensen,et al.  Effect of Temperature on Pressure Head-Water Content Relationship and Conductivity of Two Soils1 , 1972 .

[21]  S. Marsden,et al.  Effect of Temperature Level upon Capillary Pressure Curves , 1971 .

[22]  Norman R. Morrow,et al.  Irreducible wetting-phase saturations in porous media , 1970 .

[23]  S. Poston,et al.  The Effect of Temperature on Irreducible Water Saturation and Relative Permeability of Unconsolidated Sands , 1970 .

[24]  Carlon S. Land,et al.  Calculation of Imbibition Relative Permeability for Two- and Three-Phase Flow From Rock Properties , 1968 .

[25]  R. S. Chahal.  EFFECT TO TEMPERATURE AND TRAPPED AIR ON MATRIC SUCTION , 1965 .

[26]  R. J. Wygal.  Construction of Models that Simulate Oil Reservoirs , 1963 .

[27]  J. R. Philip,et al.  Moisture movement in porous materials under temperature gradients , 1957 .

[28]  R. Gardner.  RELATION OF TEMPERATURE TO MOISTURE TENSION OF SOIL , 1955 .

[29]  Norbert Adolph Lange,et al.  Handbook of chemistry , 1944 .