مشخصات پژوهش

In this work, the solubility and diffusivity of supercritical carbon dioxide (scCO2) in Poly styrene (PS) at different temperatures and pressures were measured by a magnetic suspension balance (MSB). Furthermore the bubble nucleation and growth of PS/CO2 was investigated via the visual observation batch foaming system at different temperatures and pressures. It was resulted that there was a relationship between bubble nucleation and growth with solubility and diffusivity results. It was concluded that the bubble density and expansion rate could be controlled by changing the temperature or the pressure release rate, separately. Finally bubble growth was simulated considering mass diffusion equations and implicit method. The simulation results were in good agreement compared with the experimental data. The effects of diffusivity and zero shear viscosity as main parameters, on the bubble growth behavior were investigated and it was found that the bubble growth is a diffusion controlled phenomenon.