Chemical Engineering Answers

For the Prandtl (Pr) number greater than unity, the thermal boundary layer is-___(thinner than/thicker than/same as) the hydrodynamic boundary layer?

In case of pool boiling of saturated liquid, the boiling action occurring below the critical temperature drop is called_____?

case of laminar flow heat transfer over a flat plate, The heat transfer coefficient_____ (increases/decreases/remains constant) from the leading edge of plate to the end of the plate?

The average Heat transfer coefficient for drop-wise condensation is______

(greater than/less than/equal to) the average heat transfer coefficient for film type condensation?

Comparing the flow arrangement in a heat exchnager, LMTD in parallel flow is (greater than/less than/equal to) LMTD in counter-flow?

What is the thermal diffusivity (in m³/s) of the material having properties, p-7500 kg/m³, Cp 400 J/(kg-K), k-15 W/(m-K).?

Heat transfer coefficient in laminar flow of a given fluid is (greater /smaller) than than the turbulent flow?

What is the heat flux (in W/m²) through the slab of 10cm thick if temperature drop across the slab is 40°C and the thermal conductivity of slab is 35 W/m.°C.?

a black body of total area 0.05 m² is completely enclosed in a space bounded by 15 cm thick walls. the walls have a surface area 0.5 m² and the thermal conductivity 1.07 w/m.°c. if the inner surface on the enveloping wall is to be maintained at 225 celsius and the outer wall surface is at 30 celsius , calculate the temperature of the black body. neglect the difference between inner and outer surfaces area of enveloping material.

Define the term unit operation & unit process?