Numerical analysis of hydraulic jump by an impinging jet

Abstract

This numerical work compares the available CFD transient models of an impinging jet under turbulent conditions. The rate of heat transfer into a water impinging jet on a hot flat aluminium plate was studied. The temperature of the plate was kept under the boiling point of water for analyzing the case without any phase changes. For computational purposes, we are studying the heat transfer due to a single 2D axisymmetric jet under different discharge rates in addition to predicting the location of the hydraulic jump and comparing it with different existing numerical correlations. The RANS model in ANSYS Fluent was used with the RNG k-å with surface tension models and set level VOF methods, as it is best suited for our flow conditions. The boundary conditions used were under two cases, constant wall temperature and constant heat flux condition. Grid independence test techniques were also carried out. The results obtained for both the hydraulic jump and variation of Nusselt number as a function of Reynolds number through the simulation agreed consistently well with the existing results in literature with a maximum 6% deviation.