Process fluid (tube side) with an average temp of 95 degrees F is heated by hot water (shell side) in a 2-4 shell and tube heat exchanger with counter current flow. Estimate the velocity of the process fluid , given the overall heat transfer coefficient is 150 ft/(ft^2-hr-F) and the heat transfer coefficient on the shell side is estimated to be 320 BTU/(ft^2-hr-F). The tubes are low carbon steel 3/4 OD by BWG 16.

Process fluid properties at 95 F:

- specific gravity of water at 60 F = .83

-thermal conductivity = .095 BTU/(ft-hr-F)

- viscosity = 1.8 cP

-specific heat = .72 BTU/(lb-F)