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GATE CE 2023 Set 1 — Question 63

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NAT+2 / -0MediumCoagulation & FlocculationDrinking Water TreatmentEnvironmental Engineering

Environmental Engineering → Drinking Water Treatment → Coagulation & Flocculation

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Question

A flocculator tank has a volume of 28002800 m3^3. The temperature of water in the tank is 15∘15^\circ C, and the average velocity gradient maintained in the tank is 100100/s. The temperature of water is reduced to 5∘5^\circ C, but all other operating conditions including the power input are maintained as the same. The decrease in the average velocity gradient (in %) due to the reduction in water temperature is ________ (round off to nearest integer).
[Consider dynamic viscosity of water at 15∘15^\circ C and 5∘5^\circ C as 1.139×10−31.139 \times 10^{-3} N-s/m2^2 and 1.518×10−31.518 \times 10^{-3} N-s/m2^2, respectively]
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