For which of the following purposes might a Venturi tube be used? 1. To restore fluid pressure distal to a restricted orifice 2. To help keep entrainment ratios constant with varying flows 3. To make possible entrainment of large volumes of gas
a. 1, 2, and 3
b. 2 and 3 only
c. 1 and 2 only
d. 1 and 3 only
ANS: A
The Venturi tube, as compared with a simple air injector, provides greater entrainment. Moreover, this design helps keep the percentage of entrained fluid constant, even when the total flow var-ies. A Venturi tube widens just after its jet or nozzle. As long as the angle of dilation is less than 15 degrees, this widening helps restore fluid pressure back toward prejet levels. However, the Venturi tube has one major drawbackâany buildup of pressure downstream from the entrain-ment port decreases fluid entrainment.
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