The Biot number (Bi) is the ratio of the thermal resistances inside of a body and at the surface of a body. The Biot number is defined as: Characteristic length can be estimated as:

Bejan number used in thermodynamics and fluid mechanics. Thermodynamics Dejan Number The Bejan number is the ratio of heat transfer irreversibility to total irreversibility due to heat transfer and fluid friction. It can be represented Read more…

It is a dimensionless number in use in fluid dynamics for the study of hydrodynamic instabilities in density stratified flows. It is defined as: While L and H refer to heavier and lighter fluid respectively. Read more…