Test: Reynolds Number - Chemical Engineering MCQ

Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity of 8.5 m/s and a temperature of 40 degree Celsius. The flowing air has a thermal conductivity 0.028 W/m K, kinematic viscosity 16.95 * 10 ^-6 m²/s and from empirical correlations the Nusselt number has been approximated to be 425. Find out the flow Reynolds number

Consider the above problem, find the convective heat flow coefficient

For laminar flow, Reynolds number should be

For turbulent flow, Reynolds number must be

What is the value of convective coefficient of air and superheated steam in case of forced convection?

Heat is being transferred by convection from water at 48 degree Celsius to glass plate whose surface is exposed to water at 40 degree Celsius. The thermal conductivity of water is 0.6 W/m K and the thermal conductivity of glass is 1.2 W/m K. The spectral gradient of temperature in the water at the water glass interface is 10 ^-4 K/m. The heat transfer coefficient in W/m² K is

For transient flow, the value of Reynolds number may vary between