In general, two immiscible liquids after a long period of contact across a permeable
interface,
a. achieve the same uniform composition in both phases
b. achieve the same uniform composition and temperature
c. achieve the same uniform composition, temperature, and pressure in
both phases
d. achieve the same temperature and pressure but not necessarily the same
composition in both phases
e. achieve some other conditions not stated above

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.

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