Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is__________________?
Correct answer: B. 2
- A. 0.5
- B. 2
- C. 10
- D. 100
Explanation
For conduction from an isolated sphere into a stagnant surrounding medium, the characteristic spherical solution gives Nu = hD/k = 2. This is the standard limiting Nusselt number for a stationary sphere.
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