As a fluid flows through a tube of uniform diameter, pressure drops progressively over the length of the tube. This illustrates an application of which of the following?
a. Coanda effect c. Bernoulli principle
b. Venturi principle d. Reynolds' number
ANS: D
Bernoulli stated that "As the forward velocity of a gas, or liquid, moving through a tube increas-es, the lateral wall pressure of the tube will decrease." Venturi postulated that pressure drops of fluids moving through constriction along a tube can be reversed if there is gradual dilation in the tube distal to the constriction. The Coanda effect is also based on the Bernoulli principle and demonstrates that water or gas flow can be deflected through a full 180° by careful placement of postconstriction extensions. Reynolds' number is the result of this mathematical equation: NR = v ? d ? (2r/). The turbulent flow is greater when the Reynolds' number exceeds 2000.
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