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Spheres of 40-mm diameter heated to a uniform temperature of 400°C are suddenly removed from the oven and placed in a forced-air bath operating at 25°C with a convection coefficient of 300 W/m2 · K on the sphere surfaces. The thermophysical properties of the sphere material are
and k = 15 W/m · K.
(a) How long must the spheres remain in the air bath for 80% of the thermal energy to be removed?
(b) The spheres are then placed in a packing carton that prevents further heat transfer to the environment. What uniform temperature will the spheres eventually reach?
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In the system A + B activity coefficients can be expressed by the one-parameter Margules equation with A=0.5. The vapor pressures of A and B at T=80C are 900mmHg and 600mmHg respectively. Is there an azeotrope in this system at T=80C and if so, what ..
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