26 papers · ranked by Valyu relevance
N. Gautier, Jean‐Luc Aider, Thomas Duriez, Bernd R. Noack + 2 more
'Marc Segond' 'Mara Abel'] A novel, model free, approach to experimental closed-loop flow control is implemented on a separated flow. Feedback control laws are generated using genetic programming where they are optimized using replication, mutation and cross-over of best performing laws to produce a new generation of…
Aisen Vivas, Albert van den Berg, Robert Passier, Mathieu Odijk + 1 more
Organs-on-chips are a unique class of microfluidic in vitro cell culture models, in which the in vivo tissue microenvironment is mimicked. Unfortunately, its widespread use is hampered by their operation complexity and incompatibility with end-user research settings. To address these issues, many commercial and…
Abhiram Mullapudi, Matthew Bartos, Brandon Wong, Branko Kerkez
“Smart” water systems are transforming the field of stormwater management by enabling real-time monitoring and control of previously static infrastructure. While the localized benefits of active control are well-established, the potential for system-scale control of watersheds is poorly understood. This study shows how…
Sylwia Włodarczak, Marek Ochowiak, Michał Doligalski, Bartosz Kwapisz + 4 more
'Bartosz Kwapisz' 'Andżelika Krupińska' 'Marcin Mrugalski' 'Magdalena Matuszak' 'Alessandro Bevilacqua'] This paper presents a design of a flow meter based on a programmable logic controller (PLC). The new construction of a flow meter controlled by PLC increases the possibilities for the control and automation of fluid…
Uchytil, Adam, Korda, Milan + 2 more
We demonstrate the feedback control of a weakly conducting magnetohydrodynamic (MHD) flow via Lorentz forces generated by externally applied electric and magnetic fields. Specifically, we steer the flow of an electrolyte toward prescribed velocity or vorticity patterns using arrays of electrodes and electromagnets…
Xinjie Zhang, Zhenyu Zhang
A passive microvalve has appealing advantages in cost-effective and miniaturized microfluidic applications. In this work, we present a passive flow regulatory device for enhanced flow control in a microfluidic environment. The device was integrated with two functional elements, including a flow regulating valve and a…
Shereen Abouelazayem, Ivan Glavinić, Thomas Wondrak, Jaroslav Hlava
The flow structure in the mold of a continuous steel caster has a significant impact on the quality of the final product. Conventional sensors used in industry are limited to measuring single variables such as the mold level. These measurements give very indirect information about the flow structure. For this reason…
Bryn Jones, Peter H. Heins, Eric C. Kerrigan, J. F. Morrison + 1 more
'A. S. Sharma'] This paper addresses the problem of designing low-order and linear robust feedback controllers that provide a priori guarantees with respect to stability and performance when applied to a fluid flow. This is challenging since whilst many flows are governed by a set of nonlinear, partial…
Wilhelm Hasselbring, Maik Wojcieszak, Schahram Dustdar
When we consider the application layer [1] of networked infrastructures, data and control flow are important concerns in distributed systems integration. Modularity is a fundamental principle in software design [2], in particular for distributed system architectures. Modularity emphasizes high cohesion of individual…
Guodong Qu, Jianying Li, Chen Peng, Qi Guo
Aiming at the sticking phenomenon between the valve core and the valve sleeve when the valve core moves, and to solve the problem that the torque required to drive the valve core to rotate is large, the fluid-solid coupling simulation analysis of the valve core is carried out in this study, and then the valve core…
Fang Yang, Zisheng Lian, Zhandong Zhang, Runze Li + 3 more
To address the technical challenge where traditional high-pressure, large-flow emulsion pump stations cannot adapt to the drastic flow rate changes in hydraulic supports due to the fixed displacement of their quantitative pumps-leading to frequent system unloading, severe impacts, and damage-this study proposes an…
Moritz Linkmann, Florian Knierim, Stefan Zammert, Bruno Eckhardt
Considering channel flow at Reynolds numbers below the linear stability threshold of the laminar profile as a generic example system showing a subcritical transition to turbulence connected with the existence of simple invariant solutions, we here discuss issues that arise in the application of linear feedback control…
Meng-Chun Hsu, Mehran Mansouri, Nuzhet N.N. Ahamed, Indranil M. Joshi + 3 more
Controlled fluid flows are the hallmark feature of microfluidic culture systems and provide precise definition over the biophysical and biochemical microenvironment. Flow control is commonly achieved using displacement-based (e.g., syringe or peristaltic pumps) or pressure-based techniques. These methods offer complex…
Mees N. S. de Graaf, Aisen Vivas, Andries D. van der Meer, Christine L. Mummery + 1 more
Organ-on-Chip (OoC) devices are increasingly used to mimic the tissue microenvironment of cells in intact organs. This includes microchannels to mimic, for example, fluidic flow through vessels. Present methods for controlling microfluidic flow in these systems rely on gravity, rocker systems or external pressure…
Kaustav A. Gopinathan, Avanish Mishra, Baris R. Mutlu, Jon F. Edd + 1 more
Microfluidics have enabled significant advances in molecular biology^1–3^, synthetic chemistry^4,5^, diagnostics^6,7^, and tissue engineering^8^. However, there has long been a critical need in the field to manipulate fluids and suspended matter with the precision, modularity, and scalability of electronic…
Mees N. S. de Graaf, Aisen Vivas, Andries D. van der Meer, Christine L. Mummery + 2 more
'Christine L. Mummery' 'Valeria V. Orlova' 'Nam-Trung Nguyen'] Organ-on-chip (OoC) devices are increasingly used to mimic the tissue microenvironment of cells in intact organs. This includes microchannels to mimic, for example, fluidic flow through blood vessels. Present methods for controlling microfluidic flow in…
Neha Paddillaya, Suyog Mahulkar, Jaywant H Arakeri, Namrata Gundiah
Early atherosclerotic lesions often develop in arterial bifurcations and curvatures that experience complex disturbed flows. Lab-on-chip devices primarily adopt laminar unidirectional and oscillatory flows to characterize endothelial mechanobiology and test therapeutics. Such flows do not reproduce the time-varying…
Jan Lugowski
Flow-reaction forces acting in hydraulic valves have been studied for many decades. Despite this, they are difficult to account for due to the complexities of the jet flow. This paper focuses only on the reduction, also referred to as compensation, of the flow force as applied to a valve spool featuring a profile of a…
Barrett Smith, Sara Hashmi
Polymer flows through pores, nozzles and other small channels govern engineered and naturally occurring dynamics in many processes, from 3D printing to oil recovery in the earth's subsurface to a wide variety of biological flows. The crosslinking of polymers can change their material properties dramatically, and it is…
Colin T. Sullender, Adam Santorelli, Lisa M. Richards, Pawan K. Mannava + 2 more
Microfluidic flow phantom studies are commonly used for characterizing the performance of laser speckle contrast imaging (LSCI) instruments. The selection of the flow control system is critical for the reliable generation of flow during testing. The majority of recent LSCI studies using microfluidics used syringe pumps…
Authors not listed
Self-driving laboratories (SDLs) promise accelerated scientific discovery and product development by closing the loop between robotic execution and AI/ML-driven decision making. In practice, however, SDL orchestration remains fragmented; workflows are typically encoded as laboratory-specific scripts or bespoke…
Shane O'Sullivan, Fernando Diaz, Ian Seymour, Alan O'Riordan
While electrochemically driven, pH control-enabled, dual electrode sensing under quiescent conditions is emerging as a viable electroanalytical method, application of this approach under hydrodynamic conditions is less well documented. In this work we report the development of a finite element model (COMSOL…
Oliver Weismantel, Lakshani Weerarathna, Tanja Junkers
Using the combination of flow synthesis with online dynamic light scattering (DLS) analysis for particle size characterization and fully autonomous computer control allows for reproducible and targetable synthesis of nanoparticles from block copolymer (BCP) solutions by rapid mixing with water in a defined micromixer…
Authors not listed
The capacity to pattern biomolecules within microfluidic devices expands the scope of microfluidic technologies. In such patterned systems, surface-bound components remained localized, while the microfluidic network supplies reagents and removes waste products. This approach has enabled continuous protein expression…
Aliye Hazal Koyuncu, Jacopo Movilli, Sevil Sahin, Dmitrii V. Kriukov + 2 more
This work describes a competing activation network, which is regulated by chemical feedback at the liquid-surface interface. Feedback loops dynamically tune the concentration of chemical components in living systems, thereby controlling regulatory processes in neural, genetic, and metabolic networks. Advances in…
Authors not listed
This work investigates the fluid dynamics of electrolyte mixing within the tanks of vanadium flow batteries. Custom axisymmetric tanks are used to study the different flow regimes that emerge during battery cycling at various flow rates. A dual online diagnostic tool based on UV-vis spectroscopy enables precise…