Bejan number

English Etymology Named after Adrian Bejan. Noun en thermodynamics A dimensionless number: the ratio of heat transfer irreversibility to total irreversibility due to heat transfer and fluid friction: , where is the entropy generation contributed by heat transfer and is the entropy generation contributed by fluid friction. en fluid dynamics A dimensionless number: the pressure drop along the fluid path length in both external flows and internal flows: , where is the dynamic viscosity, is the momentum diffusivity (or Kinematic viscosity) and is fluid path length. Further reading en eponyms