Value of Prandtl number for water ranges from_________________?
Correct answer: D. 5 to 10
- A. 1 to 2
- B. 1000 to 2000
- C. 100 to 500
- D. 5 to 10
Explanation
For water near ordinary engineering temperatures, the Prandtl number is commonly of the order of 5 to 10, decreasing as temperature rises. This reflects water's relatively high momentum diffusivity compared with thermal diffusivity.
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