Acoustic Flowmeter
This type of flowmeter (ultrasonic) can give a continuous measurement of the flow rates of both open channel or pipe. It is nonintrusive, nonmechanical and can give a reading in either flow direction.
There are two types used:
- Ultrasonic Doppler Meter
- Ultrasonic Transit-time Meter
Acoustic Flowmeter FORMULA |
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\(\large{ v_a = \frac {l} {2 \; \cos \; \theta} \left( \frac {1} {t_d} - \frac {1} {t_u} \right) }\) | ||
Symbol | English | Metric |
\(\large{ v_a }\) = average axial velocity of water flow | \(\large{ \frac{ft}{sec} }\) | \(\large{ \frac{m}{s} }\) |
\(\large{ l }\) = acoustic path length between transducer faces | \(\large{ ft }\) | \(\large{ m }\) |
\(\large{ t_d }\) = acoustic signal downstream travel time | \(\large{ sec }\) | \(\large{ s }\) |
\(\large{ t_u }\) = acoustic signal upstream travel time | \(\large{ sec }\) | \(\large{ s }\) |
\(\large{ \theta }\) = angle between acoustic path and the pipe's longitudinal axis | \(\large{ deg }\) | \(\large{ rad }\) |
Acoustic Flowmeter calculator