Abstract:
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Knowledge and accurate prediction of physiochemical properties of liquid mixtures
is of great importance for understanding intermolecular interactions—interactions
which determine the macroscopic performance of liquid fuels used in modern high
performance engines. Accurate prediction of viscosity and surface tension for binary
mixtures of components with marked property differences remains a challenging task
due to the nonlinearity and sensitivity of the detailed molecular interactions of the
blend components. This challenge is compounded by the non-Newtonian fluid effects
that begin to develop as seed-particles are added to the flow. For this work, detailed
fluid measurements of viscosity, density, and surface tension were carried out using
rigorously prepared binary mixtures of dipropylene glycol and water at nominal
lab temperatures. In addition, a selection of 5 glycol/water blends were tested in
the Chalmers steady spray rig under turbulent flow conditions. Here, microscale
fluorescent particle velocimetry was applied to measure the internal velocity profile
in a plain-orifice nozzle. These flows generated by the spray rig are central to several
ongoing projects at Combustion, and highly sensitive to fluid properties. These data
and the subsequent property model comparisons of this work directly support the
primary breakup studies of the spray group at Combustion and studies of pulsating
and constrained flows at Fluid Dynamics. |