Breakup of a power-law liquid sheet formed by an impinging jet injector

► We perform a linear stability analysis on the power-law liquid sheet. ► Breakup length and wavelength of disturbance on the liquid sheet are predicted. ► Breakup length and wavelength decrease as We-number of the liquid sheet increases. ► The coefficient in empirical equation predicting breakup length should be 8 for gel. ► The experiments verify the linear stability method for gel.