Q1: Baffles provided on the shell side of a shell and tube heat exchanger are meant for

ANS:C - both 'a' & 'b'.

The baffles provided on the shell side of a shell and tube heat exchanger primarily serve two purposes:

1. Providing Support for the Tubes (Option 'a'): Baffles are designed to support the tubes within the shell. They help prevent sagging, vibration, and damage to the tubes, especially in high-pressure applications. By holding the tubes in place, they ensure proper alignment and spacing, which is crucial for efficient heat transfer.
2. Improving Heat Transfer (Option 'b'): Baffles are strategically placed within the shell to induce turbulence in the fluid flow. Turbulent flow enhances heat transfer by promoting better mixing of the fluid streams. This increased turbulence disrupts the formation of thermal boundary layers and promotes greater contact between the tube surface and the shell-side fluid, thereby improving heat transfer rates.