Browsing by Subject "capillary flow"
Now showing 1 - 2 of 2
- Results Per Page
- Sort Options
Item Capillary-Driven Flow in Open Microchannels Printed with Fused Deposition Modeling(University of Texas at Austin, 2015) Lade, Robert K. Jr; Hippchen, Erik J.; Rodgers, Luke; Macosko, Christopher; Francis, Lorraine F.The fundamentals of fluid flow in 3D printed, open microchannels created using fused deposition modeling (FDM) are explored. Printed microchannels are used in microfluidic devices and have potential applications in embedding electronics in plastic substrates. However, FDM parts possess rough surfaces, and in this study, surface topography is shown to have an important impact on flow behavior, causing the liquid to travel down the channel with a characteristic ‘pulsing’ movement. We also analyze the influence of print orientation on capillary flow, where microchannels printed in specific orientations are shown to exhibit different flow dynamics.Item Rheology and Applications of Particulate Composites in Additive Manufacturing(University of Texas at Austin, 2019) Xia, Bin; Krueger, Paul S.To provide different functionalities such as electrical conductivity or magnetic permeability, particulate composites have been utilized widely in additive manufacturing. These types of materials are usually formulated with different functional particles and shear thinning non-Newtonian fluids such as polymer melts and silicone. The materials are viscous non-Newtonian suspensions during formulation and printing, and their rheology is a key factor for the processing. This paper will concentrate on suspensions with micron-sized particles, and discuss the rheology and overall flow behavior in capillaries scaled appropriately for additive manufacturing applications (around 1 mm ID). Micron size glass beads and shear thinning silicone are used to demonstrate the impact of particle volume fraction on the shear thinning behavior. The impact of particle and capillary size on viscosity and jamming conditions will be discussed. Previous models based on Newtonian fluids and in free flowing conditions will also be reviewed and compared.