# Explain how the boundary layer thickness is defined- Give the definition of the friction coefficient: Thermofluids, Assignment, UOS, UK

## SECTION C-

7. (a) Explain how the boundary layer thickness is defined.

(b) Give the definition of the friction coefficient.

(c) A hot vertical plate at 230°C is placed in a room where the air temperature is 24°C. The plate is 0.80 m high. Air properties at the film temperature are as follows: the thermal conductivity is k = 33.8×10-3 W/m K, the kinematic viscosity is v = 26.4×10-6 m2/s, the thermal diffusivity is a = 38.3×10-6 m2/s, and the Prandtl number is Pr = 0.69.

Calculate

(i) The film temperature

(ii) The expansion coefficient

(iii) The heat flux from the plate to the air

Note: Nusselt number in free convection flow over a vertical plate is

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