Year: 2016 | Month: October-December | Volume: 1 | Issue: 4 | Pages: 9-14
Diffusivity: A Review on Research and Studies with Insight into Affecting Parameters
Sunil Jayant Kulkarni
Datta Meghe College of Engineering, Airoli, Navi Mumbai, Maharashtra, India.
Diffusivity is number of moles transferred per unit area per unit time per unit concentration gradient. The molar flux in molecular diffusion is divided into two parts. One is due to bulk motion and other is due relative speed of particle or molecule. Diffusion plays major role in applications such as drying, catalysis and many other chemical engineering applications. Diffusion through solid is classified as diffusion through porous solid, diffusion through polymers and surface diffusion. Depending on size of molecule, porous diffusion is classified as Fickian, Knudsen diffusion and transient diffusion. Various investigators have carried out studies on diffusivity and its affecting parameters. Current review summarizes research and studies on diffusivity and its affecting parameters.
Key words: Temperature, pressure, moisture diffusivity, coefficients, mechanisms