M.Sc.

A theoretical study has been performed to analyze the mass transfer and shear stress in co-current annular,two phase gas-liquid (air-water), turbulent flow conditions in a horizontal pipe using eddy diffusivity concept. The mass transfer coefficient has been predicted and discussed for a wide range of liquid superficial Reynolds number (Re=2000 to 40000), gas superficial Reynolds number (Re=10000 to 80000), liquid Schmidt number (Sc temperatures (25oC - 60oLsgsL=100 to 3000), and liquid C).

  This thesis suggests a simple system to study, and accordingly design, bubble column reactors. The suggested system focuses on studying two important parameters of the gasliquid mass transfer operations.

 Fluidization process is widely used by a great assortment of industries worldwide and represents a trillion dollar industry [6].They are currently used in separation, classification, drying and mixing of particles, chemical reactions and regeneration processes;one of these processes is the mass transfer from an immersed surface to a gas fluidized bed. Mass transfer coefficient is a diffusion rate constant that relates the mass transfer rate, mass transfer area, and concentration gradient as driving force.