Modelling combustion and heat transfer

Tudor

How can I simulate the combustion using a pdf mixture and, in the same time, the heat transfer between the exhaust hot gases and water through a wall? I ask this because when you have a pdf mixture for non-premixed combustion in Fluent 6.2 you can't use a massflow-inlet of a fluid that isn't a part of the mixture, like liquid water. If there is a solution please let me know! Thank's!