Calculate the value of mass transfer coefficient and the flux for mass transfer from a sphere of naphthalene to air at 45c and 1 atm abs flowing at a velocity of 0.305 m/s. the diameter of the sphere is 25.4 mm. the diffusivity of naphthalene in air at 45c id 6.92*10^-6 m^2/s. and the vapor prssure of solid naphthalene is 0.555 mmhg.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k