Friction Coefficient Calculation for Racquet Grip Design

[Gregor101]

For my final year project at uni, I am designing a new racquet grip. Past of investigating current products, I am going to test the friction properties of current grips. My plan is to rub a number of grips for a set time and then, using a heat sensor gun, measure the grips heat.

My question is, what formula(s) should I use to take this heat value and calculate a meaningful friction value? It is very likely i won't know the specific materials of the grips tested

 

[billy_joule]

That seems like an experiment with a lot of opportunity for error, heat capacity, heat transfer coefficient, emissivity etc will all affect you results for the worse.
Why can't you use the traditional friction coefficient experiment? (ie a block & ramp)