Furthermore, this linear regime is observed for all studied contact angles, where the lower the contact angle, the faster the transition into the Lucas-Washburn regime occurs. This is due to the higher capillary force, as the liquid column imbibes into the pore much quicker than for cases with higher contact angle, and as such the viscous drag force quickly overtakes the dissipation force caused by the changes in dynamic contact angle. Thus, the regime transition is faster. Despite this, we see that the contact angle has little effect on the position at which the switch between the linear and Lucas-Washburn regimes occur, where we find that at around z ∼ 10r the dissipative forces balance each other out (see Figure 3). We also see that changes in radius can greatly affect the transition from a linear to Lucas-Washburn growth rate, where a larger radius leads to considerably large crossover lenghts (z ∼ 1000r). Our work also highlights the usage of DNS using phase-field methods as a viable pathway for investigating nano and mesoscale imbibition processes, in junction with experimental work and molecular dynamic simulation. Systematic comparisons between phase-field methods and molecular dynamics have been done previously, which show the potential that phase-field approach also works on the atomistic scale.