page_title: Squeeze flow
section_title: Newtonian fluids
hierarchical_section_title: Squeeze flow / Basic Assumptions / Newtonian fluids
caption_attribution_description: English: This diagram depicts squeeze flow of a generic Newtonian material between two parallel plates.
context_page_description: Squeeze flow is a type of flow in which a material is pressed out or deformed between two parallel plates or objects. First explored in 1874 by Josef Stefan, squeeze flow describes the outward movement of a droplet of material, its area of contact with the plate surfaces, and the effects of internal and external factors such as temperature, viscoelasticity, and heterogeneity of the material. Several squeeze flow models exist to describe Newtonian and non-Newtonian fluids undergoing squeeze flow under various geometries and conditions. Numerous applications across scientific and engineering disciplines including rheometry, welding engineering, and materials science provide examples of squeeze flow in practical use.
context_section_description: Several equations accurately model Newtonian droplet sizes under different initial conditions.
  
  Consideration of a single asperity, or surface protrusion, allows for measurement of a very specific cross-section of a droplet. To measure macroscopic squeeze flow effects, models exist for two the most common surfaces: circular and rectangular plate squeeze flows.
caption: Single asperity squeeze flow diagram at initial and follow-on conditions; plates (assumed to be semi-infinite, in gray), droplet (green).
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