Assume Patm = 10^5, Pa = 14.7 psi ; ρwater ~ 1000 kg/m3 ; ρair ~ 1.2 kg/m3 ; μwater ~ 10^-3 N•s/m2 ; μair ~ 2 x 10^-5 N•s/m2 ; Vwater ~ 10^-6 m2 /s ; Vair ~ 1.67 x 10^-5 m2 /s ; g = 9.8 m/s^2 .; 1 m/s = 2.24 mph ; 1lbf = 4.45 N ; 1 m^3 = 264 gallons 2. **Drag, Raindrop.** What minimum upward wind speed will keep a small raindrop (D = 0.5 mm) from falling downward? (b) At what speed would a drop twice as large (D = 1 mm) fall in the same upward wind? Assume low Re Stokes flow but check it with your results for Re – do not iterate. **Ans OM:** (a) Uᵥ ~ 10⁰ m/s; (b) Uₜ ~ 10¹ m/s

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Answered: Drag, Raindrop. What minimum upward…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Assume Patm = 10^5, Pa = 14.7 psi ; ρwater ~ 1000 kg/m3 ; ρair ~ 1.2 kg/m3 ; μwater ~ 10^-3 N•s/m2 ; μair ~ 2 x 10^-5 N•s/m2 ; Vwater ~ 10^-6 m2 /s ; Vair ~ 1.67 x 10^-5 m2 /s ; g = 9.8 m/s^2 .; 1 m/s = 2.24 mph ; 1lbf = 4.45 N ; 1 m^3 = 264 gallons

2. **Drag, Raindrop.** What minimum upward wind speed will keep a small raindrop (D = 0.5 mm) from falling downward? (b) At what speed would a drop twice as large (D = 1 mm) fall in the same upward wind? Assume low Re Stokes flow but check it with your results for Re – do not iterate.
**Ans OM:** (a) Uᵥ ~ 10⁰ m/s; (b) Uₜ ~ 10¹ m/s

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