Implementation of a Boiling Heat Transfer Model Based on an Experimental Database

Extensive steady-state flow boiling heat transfer data have been collected for both water and oil using a test rig that allows for control of the primary variables of fluid velocity, fluid temperature, surface temperature, and surface orientation. Using the resulting database, functional relationships for boiling heat transfer trends have been determined. These boiling heat transfer relationships have been incorporated into the Ansys-Fluent commercial CFD package using a user-defined function (UDF). This software combination provides a simulation tool capable of approximating the quenching of metal parts by applying a situationally correct heat flux at each point in the part surface throughout the quench cycle. No manipulation of model tuning parameters is required. Simulation predictions are compared to test data collected for a simple pancake forging, as well as a representative aircraft turbine disk shape.