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10th Anniversary of Fluids—Recent Advances in Non-Newtonian and Complex...
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10th Anniversary of Fluids—Recent Advances in Non-Newtonian and Complex Fluids

A Special Issue of Fluids (ISSN 2311-5521) belonging to the section "Non-Newtonian and Complex Fluids".

Deadline for manuscript submissions: 31 December 2026 | Viewed by 1166

Editor

Prof. Dr. Rajinder Pal

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Interests: rheology of complex fluids; composite nanomaterials; Pickering emulsions; soft matter; thermodynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The year 2026 marks the 10th anniversary of Fluids, and to celebrate this exciting milestone, we have launched the Special Issue “10th Anniversary of Fluids—Recent Advances in Non-Newtonian and Complex Fluids” to publish cutting-edge research in this field.

The study of non-Newtonian flows has developed from traditional rheological modeling to a multidisciplinary frontier that includes bio-inspired systems, micro-nanofluidics, and AI-driven simulations. This Special Issue aims to provide a platform to define the direction of future research in this field, as well as to reflect on these developments.

We seek novel, original, peer-reviewed research, communications, and comprehensive reviews on the flow of non-Newtonian and complex fluids, including theoretical, computational, and experimental studies on non-Newtonian flow problems. In particular, we welcome contributions on (but not limited to) the following topics:

  • Modeling and simulations, including computational non-Newtonian fluid mechanics and constitutive equations;
  • Complex flows, including multiphase and geological flows, complex geometries, and drilling operations;
  • Mechanics of time-dependent materials;
  • Birefringence in non-Newtonian flows;
  • Rheology of soft-matter systems, including polymer melts and solutions, colloidal dispersions, suspensions, gels, liquid crystals, and granular materials;
  • Interfacial rheology, emulsions, and foams;
  • Rheology of bio-materials as well as living and self-assembling systems, including biopolymers, cells, tissue, swimmers, and active systems;
  • Rheology in food, pharmaceutical, and cosmetic development;
  • Electro- and magneto-rheological fluids;
  • Micro- and nanofluidics and microrheology;
  • Industrial rheology and processing.

We invite research groups working across the diverse fields of non-Newtonian and complex fluids to contribute to this important and celebratory Special Issue.

Prof. Dr. Rajinder Pal
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fluids is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • non-Newtonian fluids mechanics
  • complex fluids and soft matter
  • rheology
  • suspensions and granular materials
  • emulsions and foams
  • bio-materials and active systems
  • micro- and nanofluidics

Benefits of Publishing in a Special Issue

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • Reprint: MDPI Books provides the opportunity to republish successful Special Issues in book format, both online and in print.

Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

21 pages, 5392 KB  
Article
Apparent Hamaker Constants and Characteristic Interaction Distances Governing Sol–Gel Transitions in Aqueous Smectite Clay Dispersions
by Hiroshi Kimura, Haruka Tanabe and Susumu Shinoki
Fluids 2026, 11(9), 227; https://doi.org/10.3390/fluids11090227 - 9 Sep 2026
Viewed by 96
Abstract
Aqueous smectite clay dispersions undergo sol–gel transitions and form three-dimensional networks at relatively low clay concentrations. However, the clay and electrolyte concentrations required for gelation differ markedly among clay species, and the physical origin of these differences remains unclear. In this study, sol–gel [...] Read more.
Aqueous smectite clay dispersions undergo sol–gel transitions and form three-dimensional networks at relatively low clay concentrations. However, the clay and electrolyte concentrations required for gelation differ markedly among clay species, and the physical origin of these differences remains unclear. In this study, sol–gel state diagrams were constructed for four smectite clays based on rheological measurements, and DLVO analysis was subsequently applied to the experimentally determined sol–gel transition boundaries using the corresponding zeta potentials and Debye lengths. The apparent Hamaker constant, AH,app, decreased with increasing NaCl concentration for all clays. In addition, ln(AH,app/10−20 J) showed approximately linear relationships with the reciprocal Debye length, 1/LD, with distinct trends in the low- and high-salt regions. A characteristic interaction distance, H*, was defined as the negative of the fitted slope. H* was larger and more strongly clay-dependent in the low-salt region, whereas it became smaller and less clay-dependent in the high-salt region. The crossover in H*, observed at approximately 0.01–0.03 mol/L NaCl, occurred in the same broad concentration range as the onset of decreased transmittance and previously reported rheological changes. Because these datasets were acquired at non-identical clay volume fractions, this agreement should be regarded as qualitative rather than as a direct one-to-one correspondence. Full article
(This article belongs to the Special Issue 10th Anniversary of Fluids—Recent Advances in Non-Newtonian and Complex Fluids)
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20 pages, 5722 KB  
Article
Development of Methods for Real-Time In-Line Monitoring of Yield Stress for Non-Newtonian Fluid Using Pressure Drop and Liquid Rise Method During the Transfer of Radioactive Waste
by Anirban Saha, Michael Poirier and Dwayne McDaniel
Fluids 2026, 11(5), 120; https://doi.org/10.3390/fluids11050120 - 15 May 2026
Viewed by 643
Abstract
Real-Time In-Line Monitoring (RTIM) of rheological properties such as slurry yield stress is important in different industries for its various benefits such as significant time savings and increased safety/efficiency of processes while reducing secondary waste due to sampling or inaccurate procedures. This paper [...] Read more.
Real-Time In-Line Monitoring (RTIM) of rheological properties such as slurry yield stress is important in different industries for its various benefits such as significant time savings and increased safety/efficiency of processes while reducing secondary waste due to sampling or inaccurate procedures. This paper discusses two methods for characterizing yield stress in real time: the Pressure Loss method and the Liquid Rise method. The Liquid Rise method uses the height of the slurry in a vertical column and the pressure difference to quantify the yield stress. The Pressure Loss method uses the drop of pressure in a laminar flow of slurry to determine the yield stress. Kaolin–water slurry is used as a simulant of the non-Newtonian fluid. An experimental setup is built to demonstrate the methods, and data obtained from the experimental setup is compared with the yield stress obtained from a conventional table-top rheometer (baseline rheology). The results show a good agreement between the experimental yield stress and baseline rheology. Full article
(This article belongs to the Special Issue 10th Anniversary of Fluids—Recent Advances in Non-Newtonian and Complex Fluids)
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