Project ForgeMass Transfer
Diffusion
GATE 2011
Medium
Simultaneous heat and mass transfer is occurring in a fluid flowing over a flat plate. The flow is laminar. The concentration boundary layer will COINCIDE with the thermal boundary layer, when
- ASc=Nu
- BSh=Nu
- CSh=Pr
- Sc=Pr
Explanation
The relative thickness of the thermal and concentration boundary layers depends on the Lewis number Le=Sc/Pr=α/D. The two boundary layers coincide exactly when Le=1, i.e. Sc=Pr.
Source: GATE CH 2011 (2011)
This question is part of a 15-day revision cycle — sign in and Project Forge will bring it back the day before you'd forget it.