Objective 06: Heat Transfer at a Surface

Question 1

Fluid Film

Answer 1

A very thin layer of almost stagnant fluid at each interface between fluid and plate

Question 2

How does heat transfer through a fluid film occur?

Answer 2

1. Conduction through the fluid film
2. Convection currents within the fluid film
3. Radiation of energy from the plate to the fluid (to a lesser extent)

Question 3

What does the standard method of calculating heat transfer through fluid film rely on?

Answer 3

Empirical data

Question 4

What factors affect the Surface Heat Transfer Coefficient?

Answer 4

1. Velocity of the fluid
2. Properties of the fluid
3. Condition of the surface