Heat generated by friction force

[Prune_man]

Hi guys,

I have a circular disk on the end of a rotating shaft. The disk is pressed into another plate and is rubbing together making friction. I need to know how much heat is going to be generated by the friction.

I think it is a function of the velocity of the plate, the reaction force and the coefficient of friction but I'm not sure.

I know that the Friction force, F=coefficient of friction x Reaction force.

I'm not sure how to change this into a temperature rise or even a heat rise.

Thanks guys
Tommo

 

[FredGarvin]

The quickest way would be to take the motor power required to move the discs under load and assume that all of that power goes into your heat rise since power is energy per unit time. Of course, not all of that power will go into the temperature rise between the plates. Some of it will go into deflections of the plates and shafts, noise and heat in other areas. It should be a pretty good estimate of what your best condition would be (if you are interested in getting all of the heat possible).

 

[ravenprp]

Hi Tommo,

You're on the right track with your understanding of the factors involved in the generation of heat by friction force. As you mentioned, the friction force is a function of the coefficient of friction, the reaction force, and the velocity of the plate. However, there are a few other factors that also play a role in determining the amount of heat generated by friction.

Firstly, the surface area of contact between the two rubbing surfaces is important. The larger the surface area, the more heat can be generated. Additionally, the material properties of the two surfaces also play a role. Some materials have a higher coefficient of friction, meaning they will generate more heat than others.

To calculate the amount of heat generated, you can use the formula Q = μFv, where Q is the heat generated, μ is the coefficient of friction, F is the friction force, and v is the velocity. This will give you the heat generated per unit time, so you can calculate the total heat generated by multiplying it by the time the two surfaces are in contact.

I hope this helps! Let me know if you have any other questions.