Question

Driving force for heat transfer is .............

• A. Energy difference
• B. Pressure difference
• C. Temperature difference
• D. Velocity difference

Hint:

According to the laws of thermodynamics, heat will only flow spontaneously between two points if there is a temperature difference between them.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Transport phenomena describe how physical quantities are transferred from one region of space to another, driven by a potential gradient.

Step 2: Detailed Explanation:
Each type of transfer process is driven by a specific potential gradient:
- Heat Transfer: Driven by a temperature gradient/difference (\(\Delta T\)), as described by Fourier's Law of heat conduction:
\[ q = -k A \frac{dT}{dx} \]
- Fluid Flow (Momentum Transfer): Driven by a pressure difference (\(\Delta P\)), causing fluid to flow from high to low pressure.
- Mass Transfer: Driven by a concentration gradient/difference (\(\Delta C\)), as described by Fick's Law of diffusion.
Therefore, a temperature difference is the driving force for heat transfer.

Step 3: Final Answer:
The driving force for heat transfer is a temperature difference.