Measurement of extensional elasticity of weakly-elastic liquids
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The focus of rheology is generally on shearing because shear is the dominant mode of deformation in most transport processes. At the same time, there are processes in which extension is the dominant motion, and then the rheological challenge is to characterize fluid resistance to extensional deformation. While extensional motion is important in polymer processes such as film blowing and extrusion, this work focuses on extensional motion of solutions and suspensions primarily because extensional motion of these fluids is all printing and coating processes, including roll coating and inkjet printing. In this paper, the state of extensional rheometry is briefly reviewed and then a new technique to measure extensional flow resistance is introduced.
Key wordsextensional rheometry fluid filament fluid bridge spinnability filament breakup breaking length weak elasticity filancemeter polymer solutions drag reduction
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