Critical radius of a hollow sphere - Heat Transfer

Q. The critical radius of a hollow sphere having thermal conductivity k and h_o as convecting heat transfer coefficient of outer fluid is given by
- Published on 12 Aug 15

a. h_o / k

b. k / h_o

c. 2k / h_o

d. h_o / 2k

ANSWER: 2k / h_o

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Critical radius of a hollow sphere - Heat Transfer

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