Mechanism of electrostatic field on interface and particle interaction between salt solution and air
To explore the feasibility of using electrostatic field as a new method to enhance energy and mass transfer at the gas-liquid interface,the micro-mechanism of electrostatic field enhancing energy and mass trans-fer in the salt solution-air system was studied.Taking the Lithium bromide solution with the mass fraction of 50％as an example,the changes of the interface structure characteristics,particle interaction and transport properties under the electrostatic field with the strength of 0 to 1 V/nm were quantitatively analyzed using the molecular dynamics simulation method.The results indicate that the external electrostatic field can increase the thickness of the gas-liquid interface area and affect the orientation of water molecules,thus increasing the prob-ability of water molecules participating in the energy and mass transfer process.The external electrostatic field can also weaken the interaction force between particles,reduce surface tension,destroy the hydrogen bonding structure of the interface layer,thereby weakening the resistance of energy and mass transfer between phases.Under the combined effects of several factors,the self-diffusion coefficients of water molecules at the gas-liq-uid interface increase,thus strengthening the interphase energy and mass transfer.Therefore,an external elec-trostatic field is expected to become a new method for enhancing the energy and mass of the humidifying salt solution-air system by regulating the interface structure and molecular behaviors.
liquid-vapor interfacemass transferelectric field enhancementsolution dehumidificationmo-lecular dynamics
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