Moving to another question will save this response. uestion 1 In Fixed and Fluidized Bed Experiment. When the particle size increases, the minimum fluidization velocity will Increase Decrease Constant In the wetted wall column, when Reynold's number increase, the Mass transfer coefficient will Increase Constant Depends on the phase (Gas or Liquid phase-controlled) Decrease The most important advantage of a Wetted Wall Column over the packed column is It is more efficient for rather insoluble gases. Its mass transfer area is larger and gives higher flux. Its mass transfer area is accurate and easy to be calculated. It is more efficient for very soluble gases. In the wetted wall column and according to the Film theory, the concentrations at both sides of the interface (i.e. gas interface and liquid interface) are Identical, but not in equilibrium All are correct In equilibrium, but maybe not identical Both identical and in equilibrium