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Complex Fluid Engineering Lab
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A lab that unravels the flow of complex fluids, whose flow behavior is not proportional to the force applied.
AboutAbout the lab
How small changes inside a fluid alter the flow as a whole
The Hidema Lab studies the rheology of complex fluids.
Complex fluids contain polymers, fine particles, and the like, and their flow is not proportional to the force applied.
They appear in many everyday settings, such as daily necessities, food, fluids used in industry, blood, and tears.
The lab pursues both basic research that unravels how these fluids flow and applied research that uses complex fluids to solve problems in society.
Key terms
- Rheology
- The study of how a material flows and deforms when force is applied to it
- Wormlike micelles
- Long, string-like assemblies formed when surfactant molecules aggregate
NewsLab news
Paper published in Physics of Fluids and selected as an Editor's Pick
Paper published in Journal of Non-Newtonian Fluid Mechanics
Paper published in Energy Conversion and Management
Paper published in Surfaces and Interfaces
A master's student received the Excellent Poster Presentation Award at the 73rd Rheology Symposium
ResearchResearch themes
Complex fluids that contain internal structures such as polymers, wormlike micelles, and fine particles deform those structures as they flow, and this in turn feeds back on the flow. To understand how changes in the internal structure relate to the motion of the flow as a whole, the lab carries out a wide range of experiments at different length and time scales, from microrheology, which measures the state inside the fluid, to microchannel experiments that observe the whole flow.
*Illustrative imagePolymers, wormlike micelles, and turbulence
In fluids with a very small amount of added polymer, turbulence can be suppressed, or conversely a special kind of turbulence can arise from the elasticity of the polymers. In collaboration with Kobe University and others, the lab investigates how the stretching and contracting of polymers in the fluid determines whether the flow becomes laminar or turbulent.
*Illustrative imageElastic instability in narrow channels
The lab flows polymer solutions through microchannels whose width repeatedly narrows and widens, and studies the unstable flows produced by polymer elasticity. In collaboration with Kobe University and others, it quantified, through experiments and numerical calculation, how polymers are stretched and broken in the flow.
MembersFaculty
The Hidema Lab's members consist of faculty, secretaries, and master's and undergraduate students.As of 2026
- ProfessorRuri Hidema
- Assistant ProfessorKohei Ohie
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Rheometer” Olivier Cleynen / CC BY-SA 4.0 (cropped)
- Polymers, wormlike micelles, and turbulence: “False color image of the far field of a submerged turbulent jet” C. Fukushima and J. Westerweel, Technical University of Delft / CC BY 3.0 (cropped)
- Elastic instability in narrow channels: “High TEM electrospray” 作者不詳 / Public domain (cropped)
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