ANS:D - none of these.

The statement that "Shell side pressure drop in a shell and tube heat exchanger does not depend upon the baffle spacing & shell diameter." is incorrect. In a shell and tube heat exchanger, the shell side pressure drop is indeed influenced by factors such as baffle spacing and shell diameter.

• Baffle spacing: Baffles are used to support the tubes and direct the flow of the shell side fluid. The spacing between baffles affects the flow patterns within the shell side of the heat exchanger, thereby influencing the pressure drop. Smaller baffle spacing generally leads to higher pressure drops due to increased flow resistance.
• Shell diameter: The diameter of the shell affects the overall flow area available for the shell side fluid. Larger shell diameters typically result in lower shell side pressure drops due to reduced flow velocities and frictional losses.

• Tube diameter & pitch: Tube diameter and pitch affect the cross-sectional area available for fluid flow, thus influencing the velocity and pressure drop.
• Viscosity, density, & mass velocity of shell side fluid: These properties directly affect the flow resistance and pressure drop in the shell side fluid. Higher viscosity or density typically results in higher pressure drops, and mass velocity influences the flow velocity and hence the pressure drop.