one error about a parameter in PilchErdman model for droplet breakup

Hello,

In the Pilch Erdman model in OF, there is one error about the exponent of 0.25 for We > 25, see below. It should be -0.25. In the original paper by Pilch and Erdman in 1987, there was not correct for this parameter. The correct one can be found in the Eq. 2.20 from the book: https://www.routledge.com/Atomization-and-Sprays/Lefebvre-McDonell/p/book/9781498736251
else if (We > 45) { // bag-and-stamen breakup - eq (10) taubBar = 14.1*pow(We - 12.0, 0.25); }