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Tanjeem N, Kreienbrink KM, Hayward RC. Modulating photothermocapillary interactions for logic operations at the air-water interface. SOFT MATTER 2024; 20:1689-1693. [PMID: 38323528 DOI: 10.1039/d3sm01487h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
We demonstrate a system for performing logical operations (OR, AND, and NOT gates) at the air-water interface based on Marangoni optical trapping and repulsion between photothermal particles. We identify a critical separation distance at which the trapped particle assemblies become unstable, providing insight into the potential for scaling to larger arrays of logic elements.
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Affiliation(s)
- Nabila Tanjeem
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80303, USA.
- Department of Physics, California State University, Fullerton, California 92831, USA
| | - Kendra M Kreienbrink
- Materials Science and Engineering Program, University of Colorado, Boulder, Colorado 80303, USA
| | - Ryan C Hayward
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80303, USA.
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2
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Javaherchian J, Moosavi A, Tabatabaei SA. Numerical analysis of pressure drop reduction of bubbly flows through hydrophobic microgrooved channels. Sci Rep 2023; 13:18861. [PMID: 37914697 PMCID: PMC10620439 DOI: 10.1038/s41598-023-45260-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 10/17/2023] [Indexed: 11/03/2023] Open
Abstract
Due to the high performance of hydrophobic surfaces in pressure drop reduction, they have been proposed for various applications. However, despite the extensive uses of two-phase flows in many industries, the effect of hydrophobic surfaces on the pressure drop reduction of two-phase flows has not been well understood yet. Thus, in the present study, by implementing the phase-field and finite element methods, the bubbly flows as an example of two-phase flows are considered for examining the effect of hydrophobic microgrooved microchannels on the pressure drop reduction of these regimes in the laminar state. We found out that hydrophobic microgrooved surfaces not only can be efficient in the bubbly flow but also can even cause a maximum pressure drop reduction of up to 70%, which is almost 3.5 times higher than in single-phase flow. We also studied the influence of each parameter, such as bubbles volume or length, Reynolds number, capillary number, and their combination on this phenomenon. The pressure drop reduction grows by increasing the volume of the bubbles but decreases by increasing the flow velocity or the surface tension coefficient. The combination of these parameters demonstrated different results in some circumstances.
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Affiliation(s)
- Javane Javaherchian
- Center of Excellence in Energy Conversion (CEEC), School of Mechanical Engineering, Sharif University of Technology, Azadi Avenue, Tehran, Iran
| | - Ali Moosavi
- Center of Excellence in Energy Conversion (CEEC), School of Mechanical Engineering, Sharif University of Technology, Azadi Avenue, Tehran, Iran.
| | - Seyed Ali Tabatabaei
- Department of Mechanical Engineering, University of Tehran, North Karger Avenue, Tehran, Iran
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Biroun M, Haworth L, Abdolnezhad H, Khosravi A, Agrawal P, McHale G, Torun H, Semprebon C, Jabbari M, Fu YQ. Impact Dynamics of Non-Newtonian Droplets on Superhydrophobic Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:5793-5802. [PMID: 37041655 PMCID: PMC10134492 DOI: 10.1021/acs.langmuir.3c00043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 03/23/2023] [Indexed: 06/19/2023]
Abstract
Droplet impact behavior on a solid surface is critical for many industrial applications such as spray coating, food production, printing, and agriculture. For all of these applications, a common challenge is to modify and control the impact regime and contact time of the droplets. This challenge becomes more critical for non-Newtonian liquids with complex rheology. In this research, we explored the impact dynamics of non-Newtonian liquids (by adding different concentrations of Xanthan into water) on superhydrophobic surfaces. Our experimental results show that by increasing the Xanthan concentration in water, the shapes of the bouncing droplet are dramatically altered, e.g., its shape at the separation moment is changed from a conventional vertical jetting into a "mushroom"-like one. As a result, the contact time of the non-Newtonian droplet could be reduced by up to ∼50%. We compare the impact scenarios of Xanthan liquids with those of glycerol solutions having a similar apparent viscosity, and results show that the differences in the elongation viscosity induce different impact dynamics of the droplets. Finally, we show that by increasing the Weber number for all of the liquids, the contact time is reduced, and the maximum spreading radius is increased.
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Affiliation(s)
- Mehdi
H. Biroun
- Department
of Chemical Engineering, University College
London, London WC1E 7JE, U.K.
- Faculty
of Engineering and Environment, University
of Northumbria, Newcastle
upon Tyne NE1 8ST, U.K.
| | - Luke Haworth
- Faculty
of Engineering and Environment, University
of Northumbria, Newcastle
upon Tyne NE1 8ST, U.K.
| | - Hossein Abdolnezhad
- Faculty
of Engineering and Environment, University
of Northumbria, Newcastle
upon Tyne NE1 8ST, U.K.
| | - Arash Khosravi
- School
of Mechanical Engineering, Iran University
of Science and Technology, Tehran 13114-16846, Iran
| | - Prashant Agrawal
- Faculty
of Engineering and Environment, University
of Northumbria, Newcastle
upon Tyne NE1 8ST, U.K.
| | - Glen McHale
- Institute
for Multiscale Thermofluids, School of Engineering, University of Edinburgh, Kings Building, Edinburgh EH9 3FB, U.K.
| | - Hamdi Torun
- Faculty
of Engineering and Environment, University
of Northumbria, Newcastle
upon Tyne NE1 8ST, U.K.
| | - Ciro Semprebon
- Faculty
of Engineering and Environment, University
of Northumbria, Newcastle
upon Tyne NE1 8ST, U.K.
| | - Masoud Jabbari
- School
of Mechanical Engineering, University of
Leeds, Leeds LS2 9JT, U.K.
| | - Yong-Qing Fu
- Faculty
of Engineering and Environment, University
of Northumbria, Newcastle
upon Tyne NE1 8ST, U.K.
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Mandal J, Sarkar S. Morphology and kinematics of a train of power-law droplets in a corrugated microchannel. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2023.118691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Dong Y, Xiang X, Wang Z, Zhu C, Ma Y, Fu T. Formation of Droplets of Shear-Thinning Non-Newtonian Fluids in Asymmetrical Parallelized Microchannels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2218-2232. [PMID: 36724386 DOI: 10.1021/acs.langmuir.2c02736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Fluids containing polymers are frequently utilized in the chemical industry and exhibit shear-thinning characteristics. The flow distribution of non-Newtonian fluids in parallelized microchannels is a key issue to be solved during numbering-up. Numbering-up means increasing the number of parallelized microchannels. In this study, a high-speed camera is used to explore the distribution of fluid flow as well as the uniformity and stability of droplets in conceptual asymmetrical parallelized microchannels. Cyclohexane and carboxymethylcellulose sodium (CMC) aqueous solutions are used as the continuous phase and dispersed phase, respectively. The effects of fluctuation of pressure difference around the T-junction, the hydrodynamic resistance in microchannels, and the shear-thinning property of fluids on flow distribution and droplet formation are revealed. The uniformity and stability of droplets in microdevices with various cavity settings are compared, and an optimal configuration is proposed. Finally, prediction models for the flow distribution of shear-thinning fluids in asymmetrical parallelized microchannels are established.
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Affiliation(s)
- Yanpeng Dong
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin300072, China
| | - Xingyu Xiang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin300072, China
| | - Zhongdong Wang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin300072, China
| | - Chunying Zhu
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin300072, China
| | - Youguang Ma
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin300072, China
| | - Taotao Fu
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin300072, China
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Bezrukov A, Galyametdinov Y. Activation and Switching of Supramolecular Chemical Signals in Multi-Output Microfluidic Devices. MICROMACHINES 2022; 13:mi13101778. [PMID: 36296131 PMCID: PMC9611873 DOI: 10.3390/mi13101778] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 10/12/2022] [Accepted: 10/17/2022] [Indexed: 05/27/2023]
Abstract
In this study, we report on the developing of a continuous microfluidic reaction device that allows selective activation of polyelectrolyte-surfactant chemical signals in microflows and switches them between multiple outputs. A numerical model was developed for convection-diffusion reaction processes in reactive polymer-colloid microfluidic flows. Matlab scripts and scaling laws were developed for this model to predict reaction initiation and completion conditions in microfluidic devices and the location of the reaction front. The model allows the optimization of microfluidic device geometry and the setting of operation modes that provide release of the reaction product through specific outputs. Representing a chemical signal, polyelectrolyte-surfactant reaction products create various logic gate states at microfluidic chip outputs. Such systems may have potential as biochemical signal transmitters in organ-on-chip applications or chemical logic gates in cascaded microfluidic devices.
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