what conditions make a channel flow at a low velocity?

Answer:

Several factors can contribute to a channel flowing at a low velocity. These include a small pressure - gradient driving the flow (less force pushing the fluid), high fluid viscosity (thicker fluid resists flow more), a large cross - sectional area of the channel (more space for the fluid to spread out reducing speed), and significant frictional forces between the fluid and the channel walls.

Brief Explanations:

Fluid flow velocity is affected by driving forces (pressure - gradient), fluid properties (viscosity), channel geometry (cross - sectional area), and frictional forces.