Air knife

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/air-knife

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 airflow velocity range?Can exceed Mach 0.6 (approximately 40,000 ft/min) for high-impact applications
2. What is an air knife and how does it clean without touching?An air knife is a machine that pushes a very fast, smooth sheet of air across a surface. It can clean or dry things without touching them, because the air moves so fast and stays in one layer.
3. How does the air knife make a smooth sheet of air instead of a messy spray?The air goes through a long, thin slot inside a pressurized chamber. The slot shape keeps the air in a straight, laminar flow so it stays smooth instead of turning into a spray.

Laminar flow: A flow regime characterized by smooth, parallel layers of fluid, offering predictable and controllable force application.
Plenum: A pressurized chamber designed to distribute air evenly before it is expelled through the air knife's slot.
Mach number: A dimensionless quantity representing the ratio of the speed of an object or fluid to the speed of sound in the surrounding medium.
Galvanizing: A process of applying a protective zinc coating to steel or iron to prevent rusting, often involving precise liquid metal application and removal.