Polyelectrolyte hydrogel is a ternary mixture of water, polymer network and mobile ions. The present paper examined two popular models describing the swelling and deformation behaviors of polyelectrolyte hydrogels, i.e. the multiphasic model and the transport model. The water flow, the network deformation and the ionic diffusion are coupled in the multiphasic model, and the gradient of the flui...

wax precipitate is one of the most serious issues the oil industry is currently facing, since it can cause some troubles such as increasing of the pressure losses in pipe which subsequently increases the required power for pumpage. to remove this problem, prediction of wax disappearance temperature (wdt) seems necessary. in this study, the pressure influence on the wax disappearance temperature...

When storing gas in a salt cavern, it occupies most of the excavated volume, but lower part cavern inevitably contains residual brine, contact with gas. The design hydrogen and compressed air storage caverns requires to have thermodynamic model able accurately predict both phase properties such as densities, equilibrium (gas solubility water content vapour phase). This work proposes parameteriz...

Natural gas hydrate is a potential energy source in the future, which widely occurs nature and industrial activities, its formation decomposition are identified by phase equilibrium. The calculation of multicomponent equilibrium more complex than that single component gas, depends on accurate model characterized enthalpy free energy. Based Kvamme-Tanaka statistical thermodynamic model, theoreti...