Two adjacent compressor discs (surfaces 1 and 2) each of 0.4 m diameter are bounded at the periphery by a 0.1 m wide shroud (surface 3). given that f12 = 0.6, calculate all the other view factors for this configuration. [5 marks]
surface 2 surface 3
surface 1
(b) the initial temperature distribution across a wall with a thickness of 0.3 m is described with the following function:
cape201001
(b) the spectral emissivity of the outer surface at 1000 k is such that at
wavelengths between 0 and 5 μm the emissivity (ε) is 0.3; between 5 and 8 μm, ε is 0.8 and from 8 μm to ∞, ε is 0.2. determine the average emissivity of th