Find the process
(a) Multistage cross flow
(b) Single stage cross flow
(c) Multistage counter flow
(d) Single stage counter flow
I had been asked this question by my school teacher while I was bunking the class.
I'm obligated to ask this question of Design of Extractor for Multistage Stage Operations in chapter Diffusion in Solids and Molecular Diffusion in Fluids of Mass Transfer