Bernoulli vs. Venturi?

Cecil's Columns/Staff Reports
1

In a classic column on gas pump shutoff, Cecil refers to the Bernoulli effect as being the tendency of a stream of fluid to draw in surrounding fluid. I thought this was the Venturi effect, and that the Bernoulli effect was that a deflected stream had a lower density than a direct stream (i.e., under & over an airplane wing, which turns out not to be nearly as responsible for flight as we’ve been taught but that’s a whole nother post).

Can some fluid/aerodynamics wizard straighten me out on this?

2

Bernoulli’s equation is responsible for the Venturi effect. Bernoulli says that the various energies in a flow are constant. When you pass fluid through a narrowed opening, it has to speed up, so the pressure goes down.