Abstract
In this paper, we consider a class of semilinear parabolic equations with variable source under homogeneous Dirichlet boundary conditions in a bounded domain
with smooth boundary and
For all
we prove that the classical solutions to the above equation blow-up in finite time with arbitrary positive initial energy and suitable large initial values. This result extends a recent result by Wu et al. [Appl. Math. Lett. 2013;26:539–543] which asserts the blow-up of solutions for
, provided that
Acknowledgements
The authors would like to thank the anonymous referees for their careful reading and valuable suggestions on this article.