Heat Transfer Operations Practice Test 4

1. The relation between effective thermal conductivity of a packed bed and the thermal conductivity of the gas is?

2. The Velocity profile in a packed bed reactor is__________

3. Recognise the Heat Exchanger given below.

4. A fully packed bed with small particle size has _________ pressure drop than a bed with larger particle size.

5. What is the friction factor for the given parameters for a non laminar packed bed setup?
Density = 990 Kg/m³
Superficial velocity = 10m/s
D_P = 3mm
Porosity = 0.14
Viscosity = 2.5×10^-5kg/ms

6. The pressure drop in fluidised bed on fluidisation __________ with increasing flow rate.

7. If we have a tube of diameter 30mm and particles of diameter 2mm, the length of the tube is 10cm and the number of pellets is 100. Then what is the porosity?

8. The effective thermal conductivity of a packed bed is almost ____ the Thermal Conductivity of the gas.

9. It is usually preferred to use wiped surface heat exchangers because of reduced wear and tear of the blades and surface.

10. The thermal conductivity of the bed on complete fluidisation is________