Consider a plane composite wall that is composed of two materials of thermal conductivities ka = 0.1 w/m*k and kb = 0.04 w/m*k and thicknesses la = 10 mm and lb = 20 mm. the contact resistance at the interface between the two materials is known to be 0.30 m2*k/w. material a adjoins a fluid at 200°c for which h = 10 w/m2*k, and material b adjoins a fluid at 40°c for which h = 20 w/m2*k. (a) what is the rate of heat transfer thro

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

Find the minimum film thickness for a journal bearing with the data below. shaft diameter, d-50 mm, clearance ratio, cdratio? 0.001, shaft speed, n 2000 rpm; bearing length. i 200 mm; eccentricity ration, ? -0.55. ( note, cdratio-ca/d) the minimum film thickness is um

Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.