Quenching estimates for a non-Newtonian filtration equation with singular boundary conditions

In this paper, the quenching behavior of the non-Newtonian filtration equation $(\varphi (u){)}_t=({\mid u_x\mid }^{r-2}{u}_x{)}_x$ with singular boundary conditions, $u_x(0,t)=u^{-p}(0,t)$, $u_x(a,t)=(1-u(a,t){)}^{-q}$ is investigated. Various conditions on the initial condition are shown to guarantee quenching at either the left or right boundary. Theoretical quenching rates and lower bounds to the quenching time are determined when $\varphi (u)=u$ and $r=2$. Numerical experiments are provided to illustrate and provide additional validation of the theoretical estimates to the quenching rates and times.