4) In a tempering process, glass plate, which is initially at a uniform temperature Ti, is cooled by suddenly reducing the temperature of both surfaces to Ts The plate is 20 mm thick, and the glass has a thermal diffusivity of 6x 10-7 m2 /s. (a) How long will it take for the midplane temperature to achieve 50% of its maximum possible temperature reduction? Ans t= 63 s (b) If (Ti -T5) = 300°C, what is the maximum temperature gradient in the glass at the above time? Ans. -2.36 104 °C/m.

Elements Of Electromagnetics
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4) In a tempering process, glass plate, which is initially at a uniform temperature
Ti, is cooled by suddenly reducing the temperature of both surfaces to Ts The
plate is 20 mm thick, and the glass has a thermal diffusivity of 6x 10-7 m2
/s.
(a) How long will it take for the midplane temperature to achieve 50% of its
maximum possible temperature reduction? Ans t= 63 s
(b) If (Ti -T5) = 300°C, what is the maximum temperature gradient in the glass at
the above time? Ans. -2.36 104 °C/m. 

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