Mass Transfer

Mass Transfer ................................................................................................................................................ 1 What it is and what it isn't ......................................................................................................................... 1 What it is for. Applications ....................................................................................................................... 2 How to study it. Similarities and differences between Mass Transfer and Heat Transfer ........................ 2 Forces and fluxes .................................................................................................................................. 4 Specifying composition. Nomenclature ................................................................................................ 4 Specifying boundary conditions for composition ................................................................................. 6 Species balance equation .......................................................................................................................... 9 Diffusion rate: Fick's law .................................................................................................................... 10 The diffusion equation for mass transfer ................................................................................................ 14 Some analytical solutions to mass diffusion ........................................................................................... 15 Instantaneous point-source .................................................................................................................. 15 Semi-infinite planar diffusion ............................................................................................................. 16 Diffusion through a wall ..................................................................................................................... 17 Summary table of analytical solutions to diffusion problems............................................................. 19 Evaporation rate ...................................................................................................................................... 22 References ............................................................................................................................................... 23