@article{oai:nitech.repo.nii.ac.jp:00005402,
 author = {Nagatsu, Yuichiro and Hayashi, Atsushi and Ban, Mitsumasa and Kato, Yoshihito and Tada, Yutaka},
 issue = {2},
 journal = {PHYSICAL REVIEW E},
 month = {Aug},
 note = {We have shown experimentally that the pattern created by the displacement of a more viscous fluid by a less viscous one in a radial Hele-Shaw cell develops not radially but spirally when a more viscous sodium polyacrylate solution is displaced by a less viscous trivalent iron ion  Fe3+  solution with a sufficiently high concentration of Fe3+. Another experiment revealed that an instantaneous chemical reaction takes place between the two fluids, and at high Fe3+ concentrations it produces a film of the gel at the contact plane. The gel film is proposed to be responsible for the spiral pattern., application/pdf},
 pages = {026307-1--026307-6},
 title = {Spiral pattern in a radial displacement involving a reaction-producing gel},
 volume = {78},
 year = {2008}
}