find the mass velocity (Ge) in kg/m2-s

find the mass velocity (Gb) in kg/m2-s

A shell and tube heat exchanger with (1-1) configuration is used to cool n-propanol from 90C to 40C at a mass flow rate of 35kg/s. The heat exchanger consists of 553 tubes arranged in a square pattern with a tube outer diameter of 3/4 in, BWG 12, and a pitch of 1 in. n-propanol flows on the shell side, while water flows through the tubes. Assume (w)0.141 and fb=0.1955, Baffle spacing (B):0.61m Properties of n-propanol at 65C is provided below