Bernoulli's Law in a Tapered Duct — Virtual Fluids Laboratory

Fluids Report No. 2 · steady flow through a venturi — compare velocities from pressure heads and from continuity

Apparatus & Measurement

Q = 0.0 mL/s h₁−h₅ = 0 mm target ≈ 150 mm
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Procedure & apparatus details

The duct converges through the 14° taper (taps h₁→h₅) then expands. Six manometers read static pressure head at taps of diameter 25.0, 13.9, 11.8, 10.7, 10.0 and 25.0 mm; the traversing probe reads total head htotal. For each run: set the FCV so h₁−h₅ hits the target (~150, 100, 50 mm), record the manometers, then — without touching the valve — time the collection of 4 L three times. After all three runs you can reverse the section to watch the steeper 21° taper converging (qualitative observation for your discussion).

Raw Data

Collection volume = 4.0 L  ·  water 22 °C
Stopwatch: 0.00 s

Guided Data Analysis — you calculate, the tool checks

Complete all 3 runs first (manometer readings + 3 timed collections each, with the 14° taper converging). The analysis unlocks automatically.
0 / 12 measurements
Virtual lab for CE 323 (Environmental & Fluids Laboratory), Boise State University · Dr. Sondra Miller. Manometer levels are generated from the Bernoulli equation (with a realistic exit loss after the throat), so your two velocity calculations should agree in the converging section — and disagree where real losses appear.