Abstract
This paper presents a new method to determine the evaporation coefficient of trichloroethylene using a new experimental device called “activity-meter”. This device and the associated method have been developed in the Laboratory of Mechanical Engineering of the University of Montpellier 2 (France). The influence of diffusion on the vapor pressure of trichloroethylene and the influence of temperature at the liquid–gas interface were first determined. The results show that diffusion phenomena have no influence on the vapor pressure of trichloroethylene beyond 400 s of experimental time and the temperature is almost constant during experiments. Thus, in order to take into account the effects that are only due to the variation of partial pressure of trichloroethylene at the liquid–gas interface, the time interval used is between 400 s and the time required to reach equilibrium. The influence of pressure and temperature on the evaporation coefficient of pure trichloroethylene in an arid soil was then highlighted. The results show that the evaporation coefficient of trichloroethylene decreases with total vapor pressure but increases with temperature. A comparative study on evaporation coefficients conducted on water, heptane, and trichloroethylene shows that our results are in good agreement with results on volatility.
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Abbreviations
- \(C_\mathrm{p} \) :
-
Constant pressure specific heat (\(\hbox {J kg}^{-1}\,\hbox {K}^{-1}\))
- \(D_\mathrm{va} \) :
-
Diffusion coefficient of TCE vapor in air (\(\hbox {m}^{2}\,\mathrm{s}^{-1}\))
- \(h_1 \) :
-
Length of the sample (m)
- \(h_2 \) :
-
Diffusion length (m)
- \(J\) :
-
Evaporation flux (\(\hbox {kg m}^{-3}\,\hbox {s}^{-1}\))
- \(L\) :
-
Evaporation coefficient of TCE (\(\hbox {kg K s}\,\hbox {m}^{-5}\))
- \(L_\mathrm{v} \) :
-
Latent heat of vaporization (\(\hbox {J kg}^{-1}\))
- \(M_\mathrm{a} \) :
-
Molar weight of air (\(\hbox {kg mol}^{-1}\))
- \(m_\mathrm{a} \) :
-
Mass of air (kg)
- \(M_\mathrm{v} \) :
-
Molar weight of vapor (\(\hbox {kg mol}^{-1}\))
- \(m_\mathrm{v}^1 \) :
-
Mass of the vapor in compartment 1 (kg)
- \(m_\mathrm{v}^2 \) :
-
Mass of the vapor in compartment 2 (kg)
- \(n_\mathrm{a} \) :
-
Mole number of dry air (mol)
- \(P_\mathrm{a} \) :
-
Air pressure (Pa)
- \(P_\mathrm{Heq} \) :
-
Equilibrium partial pressure of heptane (Pa)
- \(P_\mathrm{g} \) :
-
Total pressure of gas (Pa)
- \(P_\mathrm{Taver} \) :
-
Average partial vapor pressure of TCE measured by the pressure sensor (Pa)
- \(P_\mathrm{Teq} \) :
-
Equilibrium partial pressure of TCE (Pa)
- \(P_\mathrm{Tsurf} \) :
-
Simulated vapor pressure of TCE (Pa)
- \(P_\mathrm{v} \) :
-
Vapor pressure (Pa)
- \(P_\mathrm{veq} \) :
-
Equilibrium vapor pressure (Pa)
- \(P_\mathrm{vini} \) :
-
Initial vapor pressure (Pa)
- \(P_\mathrm{weq} \) :
-
Equilibrium partial pressure of water (Pa)
- \(R\) :
-
Ideal gas constant (\(\hbox {J K}^{-1 }\hbox {mol}^{-1}\))
- \(S\) :
-
Surface of the sample (\(\hbox {m}^{2}\))
- \(T\) :
-
Temperature of the system (K)
- \(T_0 \) :
-
Initial temperature (K)
- \(V\) :
-
Total gas phase volume (\(\hbox {m}^{3}\))
- \(V_0 \) :
-
Gas phase volume in the initial equilibrium position (\(\hbox {m}^{3}\))
- \(V_1 \) :
-
Volume of compartment 1 (\(\hbox {m}^{3}\))
- \(\lambda \) :
-
Thermal conductivity (\(\hbox {W K}^{-1}\,\hbox {m}^{-1}\))
- \(\phi _\mathrm{g} \) :
-
Volume fraction of gas
- \(\rho _\mathrm{v} \) :
-
Apparent density of vapor (\(\hbox {kg m}^{-3}\))
- \(\rho _\mathrm{v}^*\) :
-
Real density of vapor (\(\hbox {kg m}^{-3}\))
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Acknowledgments
This work was done within the framework of collaboration between the University Montpellier 2, France and the University of Ouagadougou, Burkina-Faso and supported by the French Ministry of Foreign affairs.
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Ouoba, S., Daho, T., Cherblanc, F. et al. A New Experimental Method to Determine the Evaporation Coefficient of Trichloroethylene (TCE) in an Arid Soil. Transp Porous Med 106, 339–353 (2015). https://doi.org/10.1007/s11242-014-0404-6
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DOI: https://doi.org/10.1007/s11242-014-0404-6