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Fluids
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Recent Advances in Impinging Jets
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Recent Advances in Impinging Jets

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Heat and Mass Transfer".

Deadline for manuscript submissions: closed (15 June 2021) | Viewed by 8427

Special Issue Editor

Dr. Rene Van Hout

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
Interests: multi-phase flows; fluid-structure interactions; impinging jet flows; particle dispersion; canopy flows; particle image velocimetry; digital holography

Special Issue Information

Dear Colleagues,

Impinging jets are commonly used in many different industrial applications for the cooling of electronics or turbine blades as well as for drying textile or paper and for metal cutting, amongst others. Despite decades of research, the complex flow behavior of impinging jets is still not completely understood. However, the development of increasingly advanced numerical and experimental tools has opened up new possibilities in understanding these flows. The field of impinging jets is a broad one and this special issue invites authors to submit research that focusses on the detailed flow behavior and its effect on mass and heat transfer in impinging jet applications. Both numerical and experimental studies are invited, including flow manipulation/control techniques that may lead to performance enhancement.

Dr. Rene Van Hout
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. 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

  • impinging jets
  • industrial applications
  • mass and heat transfer
  • flow manipulation
  • flow control

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Published Papers (2 papers)

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Research

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9 pages, 430 KiB  
Article
A Simple Gas-Kinetic Model for Dilute and Weakly Charged Plasma Micro-Jet Flows
by Shiying Cai and Chunpei Cai
Fluids 2021, 6(7), 250; https://doi.org/10.3390/fluids6070250 - 7 Jul 2021
Viewed by 2282
Abstract
This paper presents a simple model for slightly charged gas expanding into a vacuum from a planar exit. The number density, bulk velocity, temperature, and potential at the exit are given. The electric field force is assumed weaker than the convection term and [...] Read more.
This paper presents a simple model for slightly charged gas expanding into a vacuum from a planar exit. The number density, bulk velocity, temperature, and potential at the exit are given. The electric field force is assumed weaker than the convection term and is neglected in the analysis. As such, the quasi-neutral condition is naturally adopted and the potential field is computed with the Boltzmann relation. At far field, the exit degenerates as a point source, and simplified analytical formulas for flow and electric fields are obtained. The results are generic and offer insights on many existing models in the literature. They can be used to quickly approximate the flowfield and potential distributions without numerical simulations. They can also be used to initialize a simulation. Based on these results, more advanced models may be further developed. Full article
(This article belongs to the Special Issue Recent Advances in Impinging Jets)
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Review

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22 pages, 1142 KiB  
Review
Coaxial Circular Jets—A Review
by René van Hout, Sudharson Murugan, Abhijit Mitra and Beni Cukurel
Fluids 2021, 6(4), 147; https://doi.org/10.3390/fluids6040147 - 8 Apr 2021
Cited by 23 | Viewed by 5362
Abstract
This review article focuses on the near-field flow characteristics of coaxial circular jets that, despite their common usage in combustion processes, are still not well understood. In particular, changes in outer to inner jet velocity ratios, ru, absolute jet exit velocities [...] Read more.
This review article focuses on the near-field flow characteristics of coaxial circular jets that, despite their common usage in combustion processes, are still not well understood. In particular, changes in outer to inner jet velocity ratios, ru, absolute jet exit velocities and the nozzle dimensions and geometry have a profound effect on the near-field flow that is characterized by shear as well as wake instabilities. This review starts by presenting the set of equations governing the flow field and, in particular, the importance of the Reynolds stress distributions on the static pressure distribution is emphasized. Next, the literature that has led to the current stage of knowledge on coaxial jet flows is presented. Based on this literature review, several regions in the near-field (based on ru) are identified in which the inner mixing layer is either governed by shear or wake instabilities. The latter become dominant when ru≈1. For coaxial jets issued into a quiescent surrounding, shear instabilities of the annular (outer) jet are always present and ultimately govern the flow field in the far-field. We briefly discuss the effect of nozzle geometry by comparing the flow field in studies that used a blockage disk to those that employed thick inner nozzle lip thickness. Similarities and differences are discussed. While impinging coaxial jets have not been investigated much, we argue in this review that the rich flow dynamics in the near-field of the coaxial jet might be put to an advantage in fine-tuning coaxial jets impinging onto surfaces for specific heat and mass transfer applications. Several open questions are discussed at the end of this review. Full article
(This article belongs to the Special Issue Recent Advances in Impinging Jets)
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