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Water inside a nanocapillary becomes ordered, resulting in unconventionalbehavior. A profound enhancement of water flow inside nanometer thincapillaries made of graphene has been observed [B. Radha et.al., Nature(London) 538, 222 (2016)]. Here we explain this enhancement as due to the largedensity and the extraordinary viscosity of water inside the graphenenanocapillaries. Using the Hagen-Poiseuille theory with slippage-boundarycondition and incorporating disjoining pressure term in combination withresults from molecular dynamics (MD) simulations, we present an analyticaltheory that elucidates the origin of the enhancement of water flow insidehydrophobic nanocapillaries.  Our work reveals a distinctive dependence of water flow in a nanocapillary onthe structural properties of nanoconfined water in agreement with experiment,which opens a new avenue in nanofluidics.

Fast water flow through graphene nanocapillaries: a continuum model approach involving the microscopic structure of confined water