Manufacturing and semi-analytical modeling of environment-friendly sound absorbent porous glasses

This work reports a new kind of environment-friendly sound absorbent porous glasses, fabricated through salt-mold-sintering method without any poisonous substances discharging. A Johnson-Champoux-Allard-Lafarge theory based semi-analytical model is developed with the help of three micro-structure factors (i.e. Kozeny number, thermal and viscous pore shape factor), to explore the sound absorption characteristics of porous glasses highly efficiently. Comparisons between semi-analytically calculated transport parameters and numerically obtained ones, along with those between semi-analytical evaluated sound absorption coefficients and experimental measurements, validate the semi-analytical model's feasibility. All semi-analytical and experimental results show that the porous glasses possess high sound absorption with thin sample thickness. Moreover, based on the semi-analytical model, the sound absorption tailoring of porous glasses regarding to pore diameter, porosity and sample thickness is investigated. The porous glasses show great potential in modern noise reduction industry with severer environmental protection restrictions.