Rainy Season Tire Safety Guide: From Fluid Mechanics to Practical Testing

31% of traffic accidents on rainy days are directly related to tire performance. Understanding the principle of interaction between tires and water is crucial:

Analysis of Drainage Mechanism

When the vehicle passes through accumulated water, the tire pattern resembles a miniature pump body:

The longitudinal main groove (8-10mm wide, 7-9mm deep) is responsible for rapid diversion of water

Horizontal fine lines (spacing 2-3mm) disrupt the surface tension of the water film

Three dimensional blade groove generates capillary effect to enhance adsorption force

Tests have shown that high-quality tires can drain 80% of the accumulated water in the contact area within 0.1 seconds.

Critical velocity formula

The critical velocity V at which the water slip phenomenon occurs is √ (10 × h × P)

Where h is the water depth (mm), P is the tire pressure (bar)

For example, when the water depth is 5mm and the tire pressure is 2.5bar, the critical speed is about 79km/h

Practical detection methods

Depth measurement: Use a professional tread gauge to measure at least 6 points

Coin Method Upgraded Version: Insert a 1 yuan coin upright into the groove, and if the horizontal line at the top of the "1" character (corresponding to 1.6mm) is exposed, it will reach the legal limit

Temperature monitoring: After driving continuously for 1 hour, use an infrared thermometer to detect that the tire surface temperature difference is greater than 15 ℃, indicating internal damage