An egg is being cooked in boiling water . Its initial temperature is 5 ° C . It is dropped into boiling water at 95oC.

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An egg is being cooked in boiling water . Its initial
temperature is 5 ° C . It is dropped into boiling water at
95oC.
Assumptions : 1. The egg is spherical in shape with a radius of
ro = 0.025 m . 2. Heat conduction in the egg is one
dimensional ( radial only ) because of thermal symmetry about the
centre . 3. The thermal properties of the e and the heat transfer
coefficient are constant . 4. The Fourier number Fo >
0.2 so that the one term approxima solutions are applicable . 5.
The thermal conductivity and diffusivity of eggs are approximated
as those of water . k = 0.6 W / mK , a = 0.14 x 10 m² / s . The
heat transfer coefficient is 1200 W / m²K . To find : The time for
the centre of the egg to reach 70 ° C
Need ASAP