Nanoscale and Microscale Phenomena

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: closed (15 June 2020) | Viewed by 7622

Special Issue Editor


E-Mail Website
Guest Editor
Aix-Marseille Université, CNRS, IUSTI UMR 7343, 5 rue E. Fermi, 13453 Marseille, France
Interests: fluid mechanics; nanoscale and microscale phenomena; gas kinetic theory; gas-solid and gas-liquid interactions; evaporation-condensation; adsorption-desorption

Special Issue Information

Dear Colleagues,

The research on nanoscale and microscale phenomena has been becoming especially important since the late 20th century, with the intensively development of different micro systems. These phenomena may be found in traditional industries and highly specialized fields such as bioengineering, chemical and biochemical engineering, micro-fabricated fluidic systems, microelectronics, aerospace technology, micro heat pipes, chips cooling etc. The small-scale phenomena are quite different from those at conventional scale or macroscale. Various interesting phenomena, not visible at macroscale, appear when the characteristic dimension of a flow goes down to micro and nanoscales, as, for example the thermal creep where a gas flows from a cold to a hot side of a microchannel. In addition, at microscale, the ratio of the volume occupied by a flow to a surface around it differs essentially from the same ratio at macroscale. Therefore, the fluid-surface interaction becomes very important and it influences considerably the flow behaviors. New instrumentational methods need to be developed applied to measure the basic physical parameters at microscale. New prediction methods and mathematical models are also indispensable to estimate the behaviors of the governing parameters. The objective of this special issue is to present the recent finding in on the nanoscale and microscale phenomena. All type of manuscripts, experimental and numerical, related to the small-scale phenomena are welcome.

Prof. Irina A. Graur
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. Micromachines 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 2600 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

  • Nanoscale phenomena
  • Microscale phenomena
  • Fluid surface interaction

Published Papers (2 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

Jump to: Review

12 pages, 8566 KiB  
Article
The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition Potential
by Caoxiong Li, Chenggang Xian, Jun Wang, Dandan Geng and Yinghao Shen
Micromachines 2020, 11(9), 794; https://doi.org/10.3390/mi11090794 - 21 Aug 2020
Cited by 8 | Viewed by 2126
Abstract
Tight matrix has relatively low permeability and porosity, with abundant micro/nano pores. The capillary force in these pores are relatively strong, making the wetting liquid easier to be imbibed in the matrix. This process is called spontaneous imbibition. The complexity of pore structure [...] Read more.
Tight matrix has relatively low permeability and porosity, with abundant micro/nano pores. The capillary force in these pores are relatively strong, making the wetting liquid easier to be imbibed in the matrix. This process is called spontaneous imbibition. The complexity of pore structure is identified as one of the key factors influencing the imbibition process, but the detailed mechanism is not clear. Thus, in this work, a method is proposed to evaluate the influence of pore structure on imbibition process. Pore structure has fractal properties in a specific scale. By using the fractal theory, an imbibition model is provided to analyze the influence of microscopic structures on spontaneous imbibition, considering the pore size distribution and pore connectivity. Also, based on this model, the influencing factors on dimensionless imbibition and diffusion rate are discussed. Results show that the pore structure has more branches, larger and shorter sub-throats has higher chance to gain a high imbibition rate. Finally, a 3D imbibition parameter cube is constructed to determine the parameter combinations in favor of strong water diffusion potential. By utilizing the analysis method based on the fractal theory, we can effectively evaluate the imbibition potential. It is helpful to provide a guidance to evaluate the water imbibition to gas production. Full article
(This article belongs to the Special Issue Nanoscale and Microscale Phenomena)
Show Figures

Figure 1

Review

Jump to: Research

22 pages, 3805 KiB  
Review
Review on Microbubbles and Microdroplets Flowing through Microfluidic Geometrical Elements
by Ana T. S. Cerdeira, João B. L. M. Campos, João M. Miranda and José D. P. Araújo
Micromachines 2020, 11(2), 201; https://doi.org/10.3390/mi11020201 - 15 Feb 2020
Cited by 25 | Viewed by 4916
Abstract
Two-phase flows are found in several industrial systems/applications, including boilers and condensers, which are used in power generation or refrigeration, steam generators, oil/gas extraction wells and refineries, flame stabilizers, safety valves, among many others. The structure of these flows is complex, and it [...] Read more.
Two-phase flows are found in several industrial systems/applications, including boilers and condensers, which are used in power generation or refrigeration, steam generators, oil/gas extraction wells and refineries, flame stabilizers, safety valves, among many others. The structure of these flows is complex, and it is largely governed by the extent of interphase interactions. In the last two decades, due to a large development of microfabrication technologies, many microstructured devices involving several elements (constrictions, contractions, expansions, obstacles, or T-junctions) have been designed and manufactured. The pursuit for innovation in two-phase flows in these elements require an understanding and control of the behaviour of bubble/droplet flow. The need to systematize the most relevant studies that involve these issues constitutes the motivation for this review. In the present work, literature addressing gas-liquid and liquid-liquid flows, with Newtonian and non-Newtonian fluids, and covering theoretical, experimental, and numerical approaches, is reviewed. Particular focus is given to the deformation, coalescence, and breakup mechanisms when bubbles and droplets pass through the aforementioned microfluidic elements. Full article
(This article belongs to the Special Issue Nanoscale and Microscale Phenomena)
Show Figures

Figure 1

Back to TopTop