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Trailing-edge flow and noise control using porous treatments

Syamir Alihan Showkat Ali, Mahdi Azarpeyvand, Carlos Roberto Ilário da Silva
2018 Journal of Fluid Mechanics  
An extensive experimental investigation is undertaken to study the effects of flow interaction with porous media, in particular in the context of the manipulation of flow over blunt trailing edges and  ...  Comprehensive boundary layer and wake measurements have been carried out for a long flat plate with solid and porous blunt trailing edges.  ...  The second author (MA) would like to acknowledge the financial support of the Royal Academy of Engineering.  ... 
doi:10.1017/jfm.2018.430 fatcat:zhvwwyu3bfc67plkcgps7dnbge

Pore-Scale Flow Characterization of Polymer Solutions in Microfluidic Porous Media [article]

Christopher A. Browne
2019 arXiv   pre-print
However, applications are limited by an incomplete understanding of the flow in porous media.  ...  Here, we describe how microfluidic tools can shed light on the physics underlying the flow of polymer solutions in porous media at high Wi and low Re.  ...  (c) A channel-centered cylinder models the impinging flow on a curved grain; W is the channel width, R is the cylinder radius, x 0 is the cylinder position, and D is the channel height.  ... 
arXiv:1909.05688v1 fatcat:eaq3cwtzivfnrhypfspsg5rzxy

Vortex shedding suppression and wake control: A review

Saman Rashidi, Masoud Hayatdavoodi, Javad Abolfazli Esfahani
2016 Ocean Engineering  
In this survey, existing studies on different methods of controlling the wake destructive behavior and suppression of vortex shedding behind bluff bodies are discussed, including the very recent developments  ...  In the first group, these methods are discussed according to the type of external source or modification of the geometry of bluff body for controlling the flow.  ...  the vortex shedding behind a square obstacle by utilizing a series of upstream rectangular cylinders.  ... 
doi:10.1016/j.oceaneng.2016.08.031 fatcat:h6yjxtqhkjdgfjwxv6yl5rnyby

A Novel Topology Optimization Approach for Flow Power Loss Minimization Across Fin Arrays

Ali Ghasemi, Ali Elham
2020 Energies  
Previous studies also indicate that fin shapes, spacing and alignment play an important role on the overall pressure losses.  ...  In this regard, a density-based topology optimization approach is developed based on the pseudo-spectral scheme and Brinkman penalization in 2D periodic domains.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/en13081987 doaj:c76f120457fd471b96ad31b399393e26 fatcat:nhar5gfovngn3kaurttsxbcx4u

Cross flow heat exchange of textile cellular metal core sandwich panels

J. Tian, T.J. Lu, H.P. Hodson, D.T. Queheillalt, H.N.G. Wadley
2007 International Journal of Heat and Mass Transfer  
This paper presents a combined experimental and theoretical study on the thermal-hydraulic performance of a novel type of periodic textile cellular structure, subjected to forced convection using both  ...  The flow friction factor is found to depend mainly on the open area ratio in the flow direction (which is dependent upon cell topology and pore fraction), whilst the amount of heat transferred is dependent  ...  An iso-flux boundary condition was imposed on the bottom face-sheet of the sandwich structures via a heating pad, while the top face-sheet was thermally insulated.  ... 
doi:10.1016/j.ijheatmasstransfer.2006.11.042 fatcat:d6adzavw5razpcq3ub253x2q7q

OSCILLATIONS OF A TURBULENT JET INCIDENT UPON AN EDGE

J.-C. LIN, D. ROCKWELL
2001 Journal of Fluids and Structures  
The ensemble-averaged turbulent statistics of the jet quickly take on an identity that is distinct fiom the statistics of the turbulent boundary layer in the channel.  ...  For the case of a jet originating from a filly turbulent channel flow and impinging upon a sharp edge, the possible onset and nature of coherent oscillations has remained unexplored.  ...  ACKNOWLEDGEMENTS The authors are pleased to acknowledge the partial support of the National Science  ... 
doi:10.1006/jfls.2000.0380 fatcat:2elaf3fcdvd27onopsoxdwmxey

Drop breakup in the flow through fixed fiber beds: An experimental and computational investigation

Prateek D. Patel, Eric S. G. Shaqfeh, Jason E. Butler, Vittorio Cristini, Jerzy Bławzdziewicz, Michael Loewenberg
2003 Physics of Fluids  
To better understand the near-field interactions, we used the boundary integral method to determine drop shape evolution in the flow around an infinite fiber within a porous medium, and our simulations  ...  In this work, we focus on the importance of near-field interactions, or the flow close to individual fibers.  ...  Each fiber was oriented in one of the two directions parallel to the channel walls, and the overall bed geometry was square symmetric.  ... 
doi:10.1063/1.1557051 fatcat:vpsglykfojcj5dfg75vvkikkgy

NUMERICAL SIMULATION OF A THREE-LAYERED RADIANT POROUS HEAT EXCHANGER INCLUDING LATTICE BOLTZMANN SIMULATION OF FLUID FLOW

E. Jahanshahi Javaran
2011 International Journal of Engineering  
This paper deals with the hydrodynamic and thermal analysis of a new type of porous heat exchanger (PHE). This system operates based on energy conversion between gas enthalpy and thermal radiation.  ...  In each section, a 2-D rectangular porous segment which is assumed to be absorbing, emitting and scattering is present.  ...  When a high temperature gas flows through a porous metal plate with high porosity, the enthalpy of working gas is effectively transformed to the porous medium via an extremely high heat transfer coefficient  ... 
doi:10.5829/idosi.ije.2011.24.03a.09 fatcat:m6wqictkovavzgiva6ekdnzvaa

On‐Chip Generation of Vortical Flows for Microfluidic Centrifugation

Heba Ahmed, Shwathy Ramesan, Lillian Lee, Amgad R. Rezk, Leslie Y. Yeo
2019 Small  
Microcentrifugation constitutes an important part of the microfluidic toolkit in a similar way that centrifugation is crucial to many macroscopic procedures, given that micromixing, sample preconcentration  ...  Yet, the dominance of capillary and viscous effects, which typically tend to retard flow, over inertial and gravitational forces, which are often useful for actuating flows and hence centrifugation, at  ...  Acknowledgement LYY is grateful for support from the Australian Research Council through a Discovery Project grant DP170101061.  ... 
doi:10.1002/smll.201903605 pmid:31535785 fatcat:3yeugd3exrfq7isgp27jqkq72m

The Twente turbulent Taylor–Couette (T3C) facility: Strongly turbulent (multiphase) flow between two independently rotating cylinders

Dennis P. M. van Gils, Gert-Wim Bruggert, Daniel P. Lathrop, Chao Sun, Detlef Lohse
2011 Review of Scientific Instruments  
The gap between the cylinders has a height of 0.927 m, an inner radius of 0.200 m, and a variable outer radius (from 0.279 to 0.220 m).  ...  Inner cylinder load cells detect skin-friction drag via torque measurements.  ...  ACKNOWLEDGMENTS This study was financially supported by the Technology  ... 
doi:10.1063/1.3548924 pmid:21361631 fatcat:hmxbdkwpnzdwjkujkm3nxu5w7q

4 The finite element method: discretization and application to heat convection problems [chapter]

Alessandro Mauro, Perumal Nithiarasu, Nicola Massarotti, Fausto Arpino
2010 Computational Fluid Dynamics and Heat Transfer  
In this chapter, we give an overview of the finite element method and its applications to heat and fluid flow problems.  ...  We start with the mixed convection problem followed by the natural and forced convection problems. The turbulent flow and convective flow through porous media are also presented.  ...  Mixed convection in a vertical parallel plate channel partially filled with a porous medium.  ... 
doi:10.2495/978-1-84564-144-3/04 fatcat:6kq32wvvavftliyi6o2s6qycnm

A microfluidic platform for characterizing the structure and rheology of biofilm streamers

Giovanni Savorana, Jonasz Slomka, Roman Stocker, Roberto Rusconi, Eleonora Secchi
2022 Soft Matter  
In the biofilm lifestyle, bacteria embed themselves in a self-secreted matrix of extracellular polymeric substances (EPS), which acts as...  ...  Biofilm formation is the most successful survival strategy for bacterial communities.  ...  Jan Vermant for the insightful discussions; Ela Burmeister for the technical support; Prof.  ... 
doi:10.1039/d2sm00258b pmid:35535650 pmcid:PMC9131465 fatcat:qk4eizhrpvdsferspgpffsk2eq

Lagrangian transport and chaotic advection in three-dimensional laminar flows [article]

Michel Speetjens, Guy Metcalfe, Murray Rudman
2019 arXiv   pre-print
This may be a first incentive to structurally integrate the 'Lagrangian mindset' into the analysis and design of 3D practical flows.  ...  Transport and mixing of scalar quantities in fluid flows is ubiquitous in industry and Nature. Turbulent flows promote efficient transport and mixing by their inherent randomness.  ...  Internal flow induced by electro-hydrodynamic forcing A configuration intimately related to the above serpentine channel exists in a translating droplet in a straight channel subject to an axial electric  ... 
arXiv:1904.07580v1 fatcat:gt5hopaqubgsxi4r67f5bvny4q

Perspectives on viscoelastic flow instabilities and elastic turbulence [article]

Sujit S. Datta, Arezoo M. Ardekani, Paulo E. Arratia, Antony N. Beris, Irmgard Bischofberger, Jens G. Eggers, J. Esteban López-Aguilar, Suzanne M. Fielding, Anna Frishman, Michael D. Graham, Jeffrey S. Guasto, Simon J. Haward (+11 others)
2021 arXiv   pre-print
We provide perspectives on viscoelastic flow instabilities by integrating the input from speakers at a recent international workshop: historical remarks, characterization of fluids and flows, discussion  ...  Viscoelastic fluids are a common subclass of rheologically complex materials that are encountered in diverse fields from biology to polymer processing.  ...  Instead, their experiments provide evidence for an elastic instability even in a straight channel with a smoothed inlet and a small hole on the top plate at the middle of the channel for pressure measurements  ... 
arXiv:2108.09841v1 fatcat:cqvbvfm27bbodlfu6y7gyps4uu

Interplay of physical mechanisms and biofilm processes: review of microfluidic methods

A. Karimi, D. Karig, A. Kumar, A. M. Ardekani
2015 Lab on a Chip  
A review on the physical processes involved in biofilm formation and the lab-on-a-chip techniques utilized to unravel the associated mechanisms.  ...  Biofilm streamers Viscoelastic biofilms can exhibit a range of interesting responses to an external applied force. A common source of external force on biofilms is hydrodynamic flow.  ...  For example, microbead force spectroscopy has been employed to quantify the variation of the adhesive force between a biofilm patch grown on the tip of an atomic force microscope (AFM) and a substratum  ... 
doi:10.1039/c4lc01095g pmid:25385289 pmcid:PMC4261921 fatcat:bfbg3gna5rboties7bps22hscq
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