Distinguish between thin and thick cylinders. And explain the term logging as applied to heat transfer?

Thin cylinders have a relatively small ratio of wall thickness to radius, while thick cylinders have a larger ratio of wall thickness to radius. Thin cylinders are typically assumed to have uniform temperature distribution across the thickness of the wall, while thick cylinders experience temperature gradients through the wall thickness.

Logging in the context of heat transfer refers to the process of recording and monitoring temperature data over time in a system or material. This data can be used to analyze heat transfer rates, identify trends, and optimize thermal performance. Logging can be done manually by taking temperature readings at regular intervals, or automatically using sensors and data logging equipment.