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The viscosity of biodiesels of soybean and rapeseed biodiesels blended with  mineral diesel fuel were measured at pressures of up to 200 MPa. Using a  falling sinker-type viscometer reproducible viscosity data were obtained  based on the time taken for a sinker to descend a fixed distance down an  enclosed tube under the influence of gravity. Measurements were taken using  pressures which correspond to those of interest in automotive common rail  diesel engines, and at temperatures of between 25oC and 80oC. In all cases,  the viscosity of the biodiesel blends were found to increase exponentially  for which the blends were noted as being more viscous than pure mineral  fuels. A pressure-freezing effect was not observed for the blends.

Experimental viscosity measurements of biodiesels at high pressure