Parabolic problem of moving boundary with relaxation of internal heat source capacity in vacuum freeze drying

A novel parabolic plane moving boundary problem (PPLMBP) with heat generation and an unknown temperature and vapor concentration at the moving sublimation front was formulated. It is adequate to vacuum freeze drying of biomaterials, pharmaceuticals etc. at combined radiative-microwave heating. A model takes into account the relaxation of internal heat generation caused by microwave heating. Numerical model equations in the plane geometry were solved by the MacCormack predictor-corrector method. The influence of relaxation time of internal heat source τs on drying kinetics has been discussed.