Numerical investigation of Circular hydraulic jump with Non-Newtonian Fluid using modified VOF Method

When a vertical liquid jet impinges on a horizontal solid surface, the liquid will spread radially on screen until at a particular radius the supercritical flow converts to subcritical flow and circular hydraulic jump phenomenon occurs. In present study, this phenomenon was simulated for first time by using Open FOAM software and modified VOF method. Validation of simulation results was performed with the experimental data and the Watson's modified theory and Bohr's approximate solution. The effect of mass flow rate and downstream height were compared in terms of quality and quantity for Newtonian fluid (water) and non-Newtonian fluid (Herschel-Bulkley). The results show that the jumps associated with the Herschel-Bulkley (HB) have smaller radius in compare to water and have low sensitive to changes in flow rate and downstream height. Variation of jump radius in HB fluid decreases with increasing flow rate and downstream height.