🔍 Key Concepts

• Shell-and-tube heat exchanger flow paths (tube side vs. shell side) • Function of segmental baffles in a lube oil cooler • Difference between number of passes and erosion/coking issues

💭 Think About

• Look at the illustration: which fluid (oil or water) is inside the tubes, and which is flowing around the outside of the tubes? • Do the baffles touch the tubes or form channels in the shell? How does that change the direction or path length of the shell-side fluid? • Which options describe temperature/chemistry problems, and which describe controlling the flow path and number of passes?

✅ Before You Answer

• Identify which colored arrows represent oil flow and which represent water flow in the picture. • Confirm which side (shell or tubes) actually contains the baffles shown in the illustration. • Ask yourself: is the main geometric effect of these baffles to control how many times a fluid crosses the tube bundle, or mainly to stop chemical/erosion damage?