Heat Transfer T...

The Nusselt number for conduction from a sphere into a stationary infinite surrounding is ‘p’. Calculate the value of p^p_.

Flow in a pipe was found to be turbulent. If the diameter of tube is now doubled and the flow rate is made four times, then the heat transfer coefficient will change by a factor of______

Let ‘Nu₁’ represent Nusselt number for laminar flow through a circular pipe and maintained at constant temperature boundary condition. ‘Nu₂’ represents Nusselt number for laminar flow through a circular pipe and maintained at constant heat flux boundary condition.

Water at 30°C flows over a flat plate maintained at 90°C at a velocity of 10 m/s. Given the viscosity, thermal conductivity and C_p of water as 4.5 × 10^-4 Pa.s, 0.65 W/mK, 4200 J/kg K. The thermal boundary layer thickness at 2 m from the leading edge of the plate is _____ mm.

Steady-state heat transfer is taking place from a vertical wall of length 0.2 m to an adjacent fluid at 21 W/m². If thermal conductivity of wall is k = 3.5 W/mK and the Nusselt number based on the wall is 18 then the magnitude of temperature gradient at the wall on fluid side is ____(K/m) (Take h  = 30 W/m²K)

A fluid (k = 0.6 W/m°C and ν = 10^-5 m²/s) enters a 10mm diameter and 15 m long tube at 298 K with a velocity of 0.5 m/s and leave the tube at 330 K. The tube is subjected to a uniform heat flux of 3 kW/m² on its surface. Calculate the temperature of the surface at the exit in (K)

Air at 20˚C is flowing with Reynolds's number of 10⁶ overheated plates. The variation of heat transfer coefficient with distance, which is measured from the leading edge is given by ______

Air at 34°C is flowing over a flat plate maintained at 120°C with a free stream velocity of 5 m/s. The plate is 10 m long and 1 m wide. Calculate the local heat transfer coefficient (in W/m²K) at 0.5 m from the leading edge of the plate. For air take Pr = 0.697, ν = 20.76 × 10^-6 m²/s, k = 0.03 W/mK.

Two horizontal steam pipes have diameters 100 mm and 300 mm and are kept in a boiler house such that mutual heat transfer is negligible. The surface temperature of each pipe is 475°C. Given the temperature of ambient air is 35°C. The ratio of heat transfer coefficients of the smaller diameter to the larger diameter pipe is ________