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2.5. Density Measurement and Z Value Calculation
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The densities of the PEG–dye solutions were measured in accordance with the China national standard GB/T 4472-2011 at 25 °C. The Z values of the PEG–dye solutions were calculated per Equation (1):
where α is the diameter of the jetting nozzle, ρ is the fluid density, η is the fluid viscosity, and γ is the surface tension.
Copyright and License information: ©2019 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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