Sakshi posted an Question
October 14, 2021 • 03:22 am 30 points
  • IIT JAM
  • Geology (GG)

. a flow with a velocity 1 cm/sec will turn turbulent if the flow depth is: a. 2 cm b. 20cm c. 200 cm d. 2000 cm

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    Saurabh 1 best-answer

    Since there is no instructions given about the fluid... taking general case of water. So density (d) = 1g/cm³ dynamic viscosity (u) = 0.01g/cm•sec Also for turbulent flow, Reynolds number(Re)= 2000(in general). Also velocity of the flow (v) = 1cm/s So depth (D) = ? Re = (d×v×D)/u (u×Re) /(d×v) = D D= 0.01×2000/1×1= 20cm . So correct option should be (B)...

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