LBM simulation of the effect of salinity on dissociation characteristics of methane hydrate
The dissociation process of marine methane hydrate is affected by seawater salinity.Based on the lattice Boltzmann method,a numerical model is established to simulate the dissociation of methane hydrate in brine at the pore scale.The dissociation kinetics of methane hydrate,mass transfer of methane and salt,gas-liquid two-phase flow and heat transfer are comprehensively considered,and the effect of salinity on methane hydrate dissociation is described by introducing additional source terms.On this basis,this paper analyzes the effect of salinity on dissociation characteristics and heat transfer characteristics of methane hydrate.The results show that the dissociation rate of methane hydrate in the salt solution is significantly faster than that in pure water.The dissociation rate increases with salinity and the dissociation duration decreases with salinity.Besides,the average temperature in the calculation domain drops sharply at the initial stage of hydrate dissociation and gradually increases to the initial inlet temperature.The lowest average temperature increases with salinity.Therefore,the increase in salinity can accelerate the dissociation rate of methane hydrate and reduce the heat absorption of hydrate dissoci-ation.
methane hydratesalinitylattice Boltzmann methoddissociation characteristicheat transfer characteristic
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