Numerical simulation of collision between two droplets in the T-shaped microchannel with lattice Boltzmann method

Merdasi, Arshia; Ebrahimi, Saman; Moosavi, Ali; Shafii, Mohammad Behshad; Kowsary, Farshad

doi:10.1063/1.4967361

Cited by 10 publications

(2 citation statements)

References 46 publications

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“…The governing equations and the method. Various methods have been developed and are available for modeling two-phase flows and tracking the interface between two phases 49,50 . The level set method has been extensively used for this purpose.…”

Section: Resultsmentioning

confidence: 99%

Non-Newtonian droplet-based microfluidics logic gates

Asghari

Moosavi

Hannani

2020

Sci Rep

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Droplet-based microfluidic logic gates have many applications in diagnostic assays and biosciences due to their automation and the ability to be cascaded. In spite of many bio-fluids, such as blood exhibit non-Newtonian characteristics, all the previous studies have been concerned with the Newtonian fluids. Moreover, none of the previous studies has investigated the operating regions of the logic gates. In this research, we consider a typical AND/OR logic gate with a power-law fluid. We study the effects of important parameters such as the power-law index, the droplet length, the capillary number, and the geometrical parameters of the microfluidic system on the operating regions of the system. The results indicate that AND/OR states mechanism function in opposite directions. By increasing the droplet length, the capillary number and the power-law index, the operating region of AND state increases while the operating region of OR state reduces. Increasing the channel width will decrease the operating region of AND state while it increases the operating region of OR state. For proper operation of the logic gate, it should work in both AND/OR states appropriately. By combining the operating regions of these two states, the overall operating region of the logic gate is achieved. Microfluidics lab-on-chip devices have many applications in diagnostic assays, analytical chemistry, and biosciences. Using droplet-based microfluidic devices may offer various benefits 1. One of the advantages is encapsulating the important fluids as a droplet in order to prevent them from chemical reactions and pollutions. Another advantage of these systems is a better mixing of the reactant inside the droplet and increasing the reaction speed 2. In this manner the sample volume decreases significantly, the cost of operation is reduced drastically, and diagnostic results are obtained in a much shorter time, higher precision, sensitivity, and portability 3. For the droplet-based microfluidic devices, one needs to consider various components such as the valves and the mixers to perform certain functions. Electric, magnetic and thermocapillary forces are some types of forces that are used to control and manipulate fluid in microfluidic circuits 4-6. Thus, these circuits may contain many components that will make their construction complicated. Furthermore, some external equipment such as the permanent magnet or wire coils should be considered 7-11. Additional components limit the portability, scalability and parallel operations. The solution is automation. In electronics, complex operations are obtained using logic gates. Logic gates have many applications like sound and molecular computing 12,13. By analogy to logic gates (in which the pressure can be analogous to the voltage, the flow rate to the electric current and the hydrodynamic resistance to the electrical resistance) one can derive their functionalities for the microfluidics 14,15. Fabricating fluidics devices that are similar to logic circuits, began in the 1960s 16,17. These devices...

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Section: Resultsmentioning

confidence: 99%

Non-Newtonian droplet-based microfluidics logic gates

Asghari

Moosavi

Hannani

2020

Sci Rep

Self Cite

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“…Bussmann et al [13] presented a methodology to simulate the fingering and splashing of droplet impacts onto a solid surface. Merdasi et al [14] investigated the deformation of two droplets within microfluidic T-junctions on a solid substrate by LBM (Please define). They reported that the deformation of the two droplets increases significantly with the increase in the relative velocity of the inlet flow, droplet size, and surface tension.…”

Section: Introductionmentioning

confidence: 99%

Maximum Deformation Ratio of Droplets of Water-Based Paint Impact on a Flat Surface

Qin

Zhang

2017

Coatings

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Abstract:In this research, the maximum deformation ratio of water-based paint droplets impacting and spreading onto a flat solid surface was investigated numerically based on the Navier-Stokes equation coupled with the level set method. The effects of droplet size, impact velocity, and equilibrium contact angle are taken into account. The maximum deformation ratio increases as droplet size and impact velocity increase, and can scale as We 1/4 , where We is the Weber number, for the case of the effect of the droplet size. Finally, the effect of equilibrium contact angle is investigated, and the result shows that spreading radius decreases with the increase in equilibrium contact angle, whereas the height increases. When the dimensionless time t* < 0.3, there is a linear relationship between the dimensionless spreading radius and the dimensionless time to the 1/2 power. For the case of 80 • ≤ θ e ≤ 120 • , where θ e is the equilibrium contact angle, the simulation result of the maximum deformation ratio follows the fitting result. The research on the maximum deformation ratio of water-based paint is useful for water-based paint applications in the automobile industry, as well as in the biomedical industry and the real estate industry. Please check all the part in the whole passage that highlighted in blue whether retains meaning before.

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Collision Behaviors of Two Successive Compound Droplets in an Abrupt Expansion Microchannel

Ho,

Vu,

2024

Microgravity Sci. Technol.

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Numerical simulation of collision between two droplets in the T-shaped microchannel with lattice Boltzmann method

Cited by 10 publications

References 46 publications

Non-Newtonian droplet-based microfluidics logic gates

Non-Newtonian droplet-based microfluidics logic gates

Maximum Deformation Ratio of Droplets of Water-Based Paint Impact on a Flat Surface

Collision Behaviors of Two Successive Compound Droplets in an Abrupt Expansion Microchannel

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