Fluid Dynamics and Heat Transfer for Non-Newtonian Fluids

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: closed (10 April 2023) | Viewed by 1607

Special Issue Editors


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Guest Editor
Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Via Branze 38, 25123 Brescia, Italy
Interests: fluid mechanics; computational fluid dynamics; multiphase flow; turbulence; heat transfer; numerical simulation; convection; heat transfer enhancement

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Guest Editor
Department of Mechanical and Industrial Engineering, University of Brescia, 25123 Brescia, Italy
Interests: energy; engineering thermodynamics; computational fluid dynamics; CFD simulation; energy saving; civil engineering; renewable energy technologies; heat exchangers; thermal engineering; adsorption
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Special Issue Information

Dear Colleagues,

We are thrilled to present a Special Issue of Processes, “Fluid dynamics and heat transfer for non-Newtonian fluids.”

Non-Newtonian fluids find application in many industrial processes. 

However, solid theories support the hydraulic design of systems with Newtonian fluids, while the same practice for complex fluids still lacks generalized knowledge since their effective viscosity changes with the flow velocity. 

Moreover, further complexities arise in nonadiabatic systems. For example, heat flux at the pipe walls drives the forced convection in the flow, and the friction between two adjacent fluid layers generates an internal heat source affecting the whole temperature field, especially at high rates of shear.

This Special Issue aims to collect the latest contributions in thermo-fluid dynamics for non-Newtonian fluids. Topics of interest for the Special Issue include (but are not limited to):

  • Numerical analysis of non-Newtonian flows. 
  • Forced convection in non-Newtonian fluids.
  • Heat transfer enhancement techniques for energy saving.
  • Scalar transport by non-Newtonian fluids.
  • Phase-change and multiphase flows.

Numerical, theoretical, and experimental studies are encouraged, and interdisciplinary approaches are also appreciated.

Prof. Dr. Pietro Poesio
Dr. Andrea Aquino
Guest Editors

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. Processes 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 2400 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

  • fluid dynamics
  • non-Newtonian fluids
  • heat transfer
  • computational fluid dynamics
  • mass transfer

Published Papers (1 paper)

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Research

15 pages, 4047 KiB  
Article
Numerical Investigation of Flow Characteristics for Gas–Liquid Two–Phase Flow in Coiled Tubing
by Shihui Sun, Jiahao Liu, Wan Zhang and Tinglong Yi
Processes 2022, 10(12), 2476; https://doi.org/10.3390/pr10122476 - 22 Nov 2022
Viewed by 1312
Abstract
Coiled tubing (CT) is widely used for horizontal well fracturing, squeeze cementing, and sand and solid washing in the oil and gas industry. During CT operation, a gas–liquid two-phase flow state appears in the tubing. Due to the secondary flow, this state produces [...] Read more.
Coiled tubing (CT) is widely used for horizontal well fracturing, squeeze cementing, and sand and solid washing in the oil and gas industry. During CT operation, a gas–liquid two-phase flow state appears in the tubing. Due to the secondary flow, this state produces a more extensive flow-friction pressure loss, which limits its application. It is crucial to understand the gas–liquid flow behavior in a spiral tube for frictional pressure drop predictions in the CT technique. In this study, we numerically investigated the velocity distribution and phase distribution of a gas–liquid flow in CT. A comparison of experimental data and simulated results show that the maximum average error is 2.14%, verifying the accuracy of the numerical model. The gas and liquid velocities decrease first and then rise along the axial direction due to the effect of gravity. Due to the difference in the gas and liquid viscosity, i.e., the flow resistance of the gas and liquid is different, the gas–liquid slip velocity ratio is always greater than 1. The liquid velocity exhibits a D-shaped step distribution at different cross-sections of spiral tubing. The secondary-flow intensity, caused by radial velocity, increases along the tubing. Due to the secondary-flow effect, the zone of the maximum cross-section velocity is off-center and closer to the outside of the tube. However, under the combined action of centrifugal force and the density difference between gas and liquid, the variation in the gas void fraction along the tubing is relatively stable. These research results are helpful in understanding the complex flow behavior of gas–liquid two-phase flow in CT. Full article
(This article belongs to the Special Issue Fluid Dynamics and Heat Transfer for Non-Newtonian Fluids)
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