Friction loss

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/friction-loss

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the physical phenomenon?Energy dissipation in a fluid due to viscosity and boundary layer effects
2. What is the governing equation (laminar flow)?Hagen-Poiseuille equation relates pressure drop to flow rate, viscosity, and pipe dimensions
3. What is friction loss in pipes?Friction loss is the energy that disappears when water moves through a pipe because of the stickiness of the water and the pipe walls. The water loses some pressure as it travels.
4. Why does water feel sticky when it goes through a pipe?The water’s layers slide past each other slowly because of its viscosity, and the layer right next to the pipe wall sticks to the wall, creating a thin sticky zone that slows the flow.

Viscosity: A fluid's inherent resistance to shear flow, quantifying its 'thickness' or internal friction.
Boundary Layer: A thin layer of fluid near a solid surface where viscous effects are significant and velocity changes rapidly.
Head Loss: The reduction in mechanical energy per unit weight of fluid due to friction and other irreversible processes.