Hello, I'm running a couple of experiments in hot rolling and am in need of calculating the coefficient of friction during these experiments. All the equations I have found to calculate this during rolling all involve parameters like the roll bite angle which I am not sure how to calculate. Can any one please refer me to a paper or book or help out with an equation that gives the coefficient of friction during hot rolling using the following parameters, forward speed, Force, and shear. I would appreciate any information in this line. Thanks.