Study On Characteristics Of Gas-Liquid Equilibrium Of Dielectric System Acted By Electrostatic Field

Gas-liquid equilibrium is one of the most important state of thermodynamics research and the basis of industrial chemical applications.The non-equilibrium system finally reaches the equilibrium state through the transfer and transmit of energy.The system in equilibrium can be described by specific state parameters.The electric fields can improve the efficiency of mass and heat transfer of the system and bring the system to a new balance.The electric fields have positive influence on the dielectric systems.exploring its action mechanism and characteristics can lay a theoretical foundation for practical application.The applied electric field is introduced into the extended basic differential equation of thermodynamics in the form of electric field energy,and the differential equation of free energy under electrostatic field describing the state of the system is obtained.The two-phase equilibrium condition requires that the temperature,equivalent pressure,equivalent chemical potential and electric potential of each phase are equal respectively.By using the condition of equal equivalent pressure,it is found that the electric field has the effect of electric field force on the phase interface,which direction is related to the direction of electric field application,and the real pressure of the two phases is not equal.The direction of the electric field is parallel to the phase interface,and the phase with larger dielectric constant the pressure is larger;the direction of the electric field is perpendicular to the phase interface,and the phase with larger dielectric constant the pressure is smaller.For gas-liquid two-phase systems,if there is a relationship Et=(?)E_n,the electric field force is zero and the two phases are equal.Consistent with the conclusions drawn by electrohydrodynamics.The Antoine equation of temperature and vapor pressure of dielectric system under the action of electric field is derived by using the condition of equal equivalent chemical potential.The effect of the electric field is related to the physical properties of the material and the direction of the electric field.When the direction of the electric field is parallel to the phase interface,it reduces the vapor pressure and increases the boiling point;When the electric field acts only on the liquid phase,the vapor pressure drop is lower and the boiling point rises higher;When the electric field only acts on the gas phase,the vapor pressure increases and the boiling point decreases.The direction of electric field is perpendicular to the phase interface,which increases the vapor pressure and decreases the boiling point.When the angle between the electric field direction and the phase interface is?/8,there is no effect.Under the action of electric field in any direction,the effect:ethanol>water>benzene.The thermodynamic conclusions are consistent with many computational simulations,theoretical and experimental results.By using the generalized Gibbs-Duhem equation and the differential equation of free energy under the action of electrostatic field,the Gibbs-Duhem equation of the binary system under the action of electrostatic field is obtained.When the temperature and pressure and the electric field intensity are constant,the change law of the material distribution of the gas-liquid equilibrium of binary system is obtained.Raoult's law under the influence of electric field is obtained by using the condition of equivalent chemical potential,and the distribution formula of gas-liquid equilibrium of binary system under electrostatic field is derived,which completes the expansion from single-component theoretical system to two-component material distribution.The influence of electric field on dielectric system is expressed by thermodynamic theoretical formula,and the thermodynamic theoretical system under the action of electric field is formed.