GATE 2019 ME (ME2) – Question 33
Water enters a 5.0 m long, 0.20 m diameter pipe at Reynolds number 500. Its velocity profile is uniform at inlet and parabolic at exit. Find exit Reynolds number.
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Correct answer: 500 to 500
Explanation
Steady incompressible continuity in a constant-diameter pipe preserves the mean speed. Reynolds number is based on this mean speed,diameter and fluid properties,all unchanged. Hence exit Re remains **500**. The centreline speed changes as the profile develops,but it is not the Reynolds-number reference speed.