On Development of a Semimechanistic Wall Boiling Model

摘要

To predict nucleate boiling, a novel semimechanistic wall boiling model is developed within a mixture multiphase flow framework available in ansys fluent. The mass transfer phenomenon is modeled using an evaporation-condensation model, and enhancement of wall-to-fluid heat transfer due to nucleate boiling is captured using a ID empirical correlation, modified for 3D computational fluid dynamics (CFD) environment; hence this model can be used for a complex-shaped coolant passage. For a series of operating conditions, the present model is rigorously validated against available experimental data in which a 50% volume mixture of aqueous ethylene glycol was used as coolant. Subsequently, this model is applied to study boiling heat transfer for a typical automobile exhaust gas recirculation (EGR) cooler under a typical condition.