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Polymers
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Microfluidics as a Platform to Manufacture, Manipulate and Test Polymeric...
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Microfluidics as a Platform to Manufacture, Manipulate and Test Polymeric Entities

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Analysis and Characterization".

Deadline for manuscript submissions: closed (5 November 2022) | Viewed by 4362

Special Issue Editor

Dr. Emilio J. Vega Rodríguez

E-Mail Website
Guest Editor
Depto. de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, E-06006 Badajoz, Spain
Interests: microfluidics; polymers; microjets; microdrops; viscoelastic jets; viscoelastic filaments; fibers; microparticles; microcapsules

Special Issue Information

Dear Colleagues,

Microfluidics has proven to be an extraordinary working platform for producing, manipulating and studying fluid and solid microentities, such as fibers, drops, capsules, particles and ligaments. The applications of these microentities is of great interest in very diverse fields, such as pharmacy, biomedicine, biotechnology, industrial engineering, and the food and agriculture industry, among others. Many of the microfluidic applications involve the processing of polymeric/viscoelastic microentities (filaments, droplets, jets, capsules, etc.). The interaction between the processing conditions and the liquid rheology plays a fundamental role in those applications. This interaction can fundamentally alter the dynamical response of the system. This Special Issue aims to present studies in this field that will contribute to the understanding of the phenomena involved and the development of new techniques. The Special Issue will cover work ranging from fundamental analyses to applications of microfluidics as applied to polymeric/viscoelastic liquids. Experimental, numerical and theoretical work is welcome.

Dr. Emilio J. Vega Rodríguez
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 100 words) can be sent to the Editorial Office for announcement on this website.

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-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly 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 2700 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

  • Fibers
  • Polymeric microparticles
  • Polymeric microcapsules
  • Viscoelastic droplets
  • Viscoelastic jets
  • Microrheology
  • Polymeric flows

Published Papers (3 papers)

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Research

13 pages, 1750 KiB  
Article
Fire-Shaped Nozzles to Produce a Stress Peak for Deformability Studies
by Alejandro Rubio, Marta López, Emilio J. Vega and María G. Cabezas
Polymers 2022, 14(14), 2784; https://doi.org/10.3390/polym14142784 - 07 Jul 2022
Cited by 1 | Viewed by 1069
Abstract
Fire-shaped nozzles can be used to study the deformability of microcapsules, particles, or cells traveling in a flow. Though their geometry depends on the dimensions of the original glass capillary and the heating conditions, they all produce a strain rate peak approximately at [...] Read more.
Fire-shaped nozzles can be used to study the deformability of microcapsules, particles, or cells traveling in a flow. Though their geometry depends on the dimensions of the original glass capillary and the heating conditions, they all produce a strain rate peak approximately at the section where the diameter is 1.5 times the minimum. The intensity of this peak and the time from its position to the neck can be easily estimated from the flow rate and three geometrical parameters, without the need for any simulation. In the convergent region of these nozzles, it is possible to observe the evolution of the deformation. It is necessary to use a sufficiently long nozzle to produce the maximum deformation before the neck. Full article
(This article belongs to the Special Issue Microfluidics as a Platform to Manufacture, Manipulate and Test Polymeric Entities)
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16 pages, 5763 KiB  
Article
Steady State of Motion of Two Particles in Poiseuille Flow of Power-Law Fluid
by Dongmei Chen and Jianzhong Lin
Polymers 2022, 14(12), 2368; https://doi.org/10.3390/polym14122368 - 11 Jun 2022
Cited by 1 | Viewed by 1381
Abstract
The steady state of motion of two particles in Poiseuille flow of power-law fluid is numerically studied using the lattice Boltzmann method in the range of Reynolds number 20 ≤ Re ≤ 60, diameter ratio of two particles 0.125 ≤ β ≤ 2.4, [...] Read more.
The steady state of motion of two particles in Poiseuille flow of power-law fluid is numerically studied using the lattice Boltzmann method in the range of Reynolds number 20 ≤ Re ≤ 60, diameter ratio of two particles 0.125 ≤ β ≤ 2.4, and power-law index of the fluid 0.4 ≤ n ≤ 1.2. Some results are validated by comparing with other available results. The effects of Re, β, and n on the steady state of motion of two particles are discussed. The results show that, for two particles of the same diameter, the particle spacing l in the steady state is independent of n. In shear-thinning fluid, l increases rapidly at first and then slowly, finally approaching a constant for different Re. In shear-thickening fluid, although l tends to be stable in the end, the values of l after stabilization are different. For two particles of different sizes, l does not always reach a stable state, and whether it reaches a stable state depends on n. When the small particle is downstream, l increases rapidly at first and then slowly in shear-thickening fluid, but increases rapidly at first and then decreases slowly, finally approaching a constant in a shear-thinning fluid. In shear-thinning fluid, the larger n is, the smaller l is. In shear-thickening fluid, β has no effect on l in steady-state. When the large particle is downstream, l increases rapidly at first and then slowly in shear-thinning fluid but increases rapidly at first and then decreases in a shear-thickening fluid. The effect of n on l in the steady state is obvious. In shear-thinning fluid, l increases rapidly at first and then slowly, the larger Re is, the smaller l is. In shear- thickening fluid, l will reach a stable state. Full article
(This article belongs to the Special Issue Microfluidics as a Platform to Manufacture, Manipulate and Test Polymeric Entities)
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10 pages, 3688 KiB  
Article
Manipulation of Elastic Instability of Viscoelastic Fluid in a Rhombus Cross Microchannel
by Meng Zhang, Zihuang Wang, Yanhua Zheng, Bifeng Zhu, Bingzhi Zhang, Xiaohui Fang, Wenli Shang and Wu Zhang
Polymers 2022, 14(11), 2152; https://doi.org/10.3390/polym14112152 - 25 May 2022
Cited by 1 | Viewed by 1338
Abstract
This paper reports the manipulation of elastic instability of the viscoelastic fluid in a rhombus cross microchannel (RCM) structure. The bistable instability and unsteady instability of the flow is firstly demonstrated in a standard cross microchannel (SCM) for reference. We then keep the [...] Read more.
This paper reports the manipulation of elastic instability of the viscoelastic fluid in a rhombus cross microchannel (RCM) structure. The bistable instability and unsteady instability of the flow is firstly demonstrated in a standard cross microchannel (SCM) for reference. We then keep the bi-stable instability over a much wider injection rate range in the RCM, which is attributed to the stabilizing effect of the rhombus structure. A semi-bistable instability was also established in the RCM at a high enough injection rate. In addition, the unsteady elastic instability is realized in the RCM through an asymmetric injection rate condition. Full article
(This article belongs to the Special Issue Microfluidics as a Platform to Manufacture, Manipulate and Test Polymeric Entities)
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