Final answer:
A stationary device that diverts the flow of flue gases is often designed with a Venturi constriction or a T-shaped cap on a chimney to effectively use Bernoulli's principle to move gases.
Step-by-step explanation:
A stationary device used to divert the flow of flue gases in systems like wood stoves or water heaters is often referred to as a chimney cap with a Venturi constriction design or, more simply, a chimney with a T-shaped cap. The design of these devices heavily relies on the principles of fluid dynamics – specifically Bernoulli's principle, which explains how a change in fluid speed leads to a change in pressure. For instance, the T-shaped cap on a chimney helps to draw up gases by creating a low-pressure area whenever there's a slight breeze. This is similar to the way a Bunsen burner entrains air for combustion or an aspirator creates a reduced pressure area to move water.