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Recent Advances in Impinging Jets

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Special Issue Editor

Dr. Rene Van Hout

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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

Published Papers (2 papers)

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Research

Jump to: Review

9 pages, 430 KiB

Open AccessArticle

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 1877

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 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

Open AccessReview

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 16 | Viewed by 4286

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,

r_{u}

, absolute jet exit velocities [...] Read more.

r_{u}

, 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

r_{u}

) are identified in which the inner mixing layer is either governed by shear or wake instabilities. The latter become dominant when

r_{u} \approx 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