1. Write down in dimensionless form the material balance equation for a laminar flow tubular reactor accomplishing a first-order reaction and having both axial and radial diffusion. State the necessary conditions for solution.
2. Falch and Gaden studied the flow characteristics of a continuous, multistage fermentor by injecting an impulse of dye to the reactor [E. A. Falch and E. L. Gaden, Jr., Biotech. Bioengr., 12 (1970) 465]. Given the following RTD data from the four-stage fermentor, calculate the Pea that best describes the data.
