KAGAKU KOGAKU RONBUNSHU, Vol.28, No.4, 478-480, 2002
Profiles of moisture and polymer content in porous material wetted with aqueous polymer solution upon convective drying
Convective dryingof a glass particle layer wetted with aqueous polyvinylalcohol (PVA) solution was examined. Profiles of moisture and PVA content in the layer during drying and the drying rate were measured for different initial solution contents. With a low initial content. it receding drying front was observed in the same way as in the layer wetted with water, and there was no PVA movement. With it high initial content, the receding front was not observed in the low content region. and much PVA moved toward the drying surface in the early period of drying and stayed there after. The PVA disturbed the drying and there was no constant rate period.
Keywords:convective drying;aqueous polymer solution;moisture content profile;polymer content profile;porous material