CHG 3111 Lecture Notes - Lecture 6: Mass Flux, Bulk Density, Latent Heat

• School: University of Ottawa
• Department: Chemical Engineering
• Course: CHG 3111
• Professor: Clémence Fauteux-Lefebvre

Document Summary

Typical units are given, always make sure the units are consistent with other values/properties and equation. Flow rate (mol/s) and flux (mol/s m2) often use the same letter and terminology, depends on the equation and material balance. Humid air = dry air + water = air water mixture = total a: specific surface of the bed [m2 surface area /m3 bed] a: slope of drying rate in falling-rate period (r = ax) A: surface area of drying solid [m2] c: heat capacity [kj/kg k] cs: humid heat of air-water mixture [kj/kg dry air k] Dp: particle diameter [m], equivalent diameter of a sphere witht the same area [m] G: mass flow rate of dry air [kg dry air/h] ( inert mass flow rate: g") (continuous dryer) G: mass flow rate of dry air/cross-section ( mass flux) [kg dry air/h m2] ( inert: g") (batch dryer) (cid:1833)=( 11+(cid:1834)) (cid:1833)=