The main contribution to pressure drop in packed beds at high particle Reynolds number i.e. Rep>1000...

 

Transcribed Image Text:

The main contribution to pressure drop in packed beds at high particle Reynolds number i.e. Rep>1000 is kinetic energy losses caused by changes in channel cross section and flow direction expressed by the Burke-Plummer equation. (i) Starting from the equation for turbulent flow through pipes derive the Burke-Plummer equation, (ii) By defining a modified friction factor,f i.e. ratio of the total pressure drop to the kinetic energy losses, show that f= 150/Re+1.75 where Re is a modified Reynolds number. [6] The main contribution to pressure drop in packed beds at high particle Reynolds number i.e. Rep>1000 is kinetic energy losses caused by changes in channel cross section and flow direction expressed by the Burke-Plummer equation. (i) Starting from the equation for turbulent flow through pipes derive the Burke-Plummer equation, (ii) By defining a modified friction factor,f i.e. ratio of the total pressure drop to the kinetic energy losses, show that f= 150/Re+1.75 where Re is a modified Reynolds number. [6]