The use of opposed nozzles configuration in the measurements of the extensional rheological properties of emulsionsJournal of Rheology - Tập 38 Số 4 - Trang 797-810 - 1994
Mark R. Anklam, Gregory G. Warr, Robert K. Prud’homme
The opposed nozzles configuration was used to measure the extensional
viscosities of water-in-oil emulsions of varying drop volume fractions between
30% and 80%. For the more dilute emulsions, the extensional viscosities decrease
with increasing elongational rate which mimics their shear viscosity behavior.
The elongational viscosities are approximately three times the shear viscosity
values in ac... hiện toàn bộ
In-line rheological monitoring of fused deposition modelingJournal of Rheology - Tập 63 Số 1 - Trang 141-155 - 2019
Timothy J. Coogan, David O. Kazmer
An in-line rheometer has been incorporated into a fused deposition modeling
printer for the first time by designing a modified nozzle with a custom pressure
transducer and a thermocouple for measuring the processed melt temperature.
Additionally, volumetric flow rates and shear rates were monitored by counting
the stepper motor pulses as well as the pulses from a custom filament encoder to
account... hiện toàn bộ
Modeling of interlayer contact and contact pressure during fused filament fabricationJournal of Rheology - Tập 63 Số 4 - Trang 655-672 - 2019
Timothy J. Coogan, David O. Kazmer
An in-line rheometer and data acquisition system are used to monitor the melt
pressure, melt temperature, and environmental temperatures while producing parts
via fused filament fabrication (FFF). Melt pressures are observed to increase
when printing parts with small layer heights, which is attributed to the
confined space created between the nozzle and the previous layer (i.e., an exit
pressure).... hiện toàn bộ