  A liquid volume containing dissolved solutes moves through a charged
nanofluidic channel under the influence of the concentration gradient of the
solutes, non-trivially modulated by the electrostatic interaction between ionic
liquid and charged surface. The available studies in this paradigm primarily
focus on either of diffusioosmosis or electrodiffusioosmosis modulated
physicochemical hydrodynamical phenomenon, essentially to obtain a net
throughput at the overlapping scales. Here, we develop a theoretical model that
accounts for the induced pressure gradient stemming from the concentration
gradient of the solutes alongside the axially varying electrical double layer
effect in tandem and characterizes the chemiosmotic flow in a
reservoir-connected nanofluidic system. Starting from the potential
distribution developed due to the solute gradient modulated electrical double
layer effect, we look at the effect of pertinent physicochemical parameters and
their eventual manifestations onto the purely chemiosmotic transport, aptly
described in this endeavor. We analytically establish a chemiosmotic velocity
scale from a macroscopic viewpoint, relating flow velocity with the relevant
parameters, and uniquely measuring the magnitude of chemiosmotic velocity. A
closer as well as consistent agreement on theoretical predictions with the
corresponding full-scale simulated results, both in the limit and beyond the
Debye-Huckel approximation, substantiates the efficacy of our theory.
