Experiment on breakup mechanism of impinging jet of power-law liquid

High-speed photography technology was used to investigate four kinds of shear-thinning Carbopol gel non-Newtonian power-law fluids with different Carbopol mass fractions by self-developed impinging jet system, the breakup pattern, spray cone angle and breakup length of liquid sheet of impinging jet were experimented and analyzed under different jet conditions. Results show that power-law fluids with different rheological properties have different breakup pattern, the higher viscosity means the more complex breakup pattern, when Weber number is about 8 000, four kinds of Carbopol gel achieve to fully developed pattern, and show the similar breakup pattern; as Weber number increases, the spray cone angle increases gradually and tends to be a stable value less than the impinging angle. with increasing of the Carbopol mass fraction, the biggest spray cone angle decreases, eventually converging to 60°, the breakup length slightly increases first and then decreases of four kinds of Carbopol gel, but the theoretical results agree well with the experimental results in trend. ©, 2015, BUAA Press. All right reserved.