fluid dynamics Smallest droplet produced in a continuous

FDMP

FDMP-Fluid Dynamics Materials Processing, Vol.17, No.4, pp. 845-857, 2021, DOI: 10.32604/fdmp.2021.015961 Abstract In order to analyze the coupled influence of temperature and humidity on early-age concrete (including cement and copper tailings), a mathematical model is introduced on the basis of the Krstulovic-Dabic hydration reaction kinetic equations. Get price

Passive and active droplet generation with microfluidics: a

A transitional regime occurs between squeezing and dripping, where the emerging droplet blocks the continuous-phase fluid partially and temporarily during its formation. Due to the partial blocking, the breakup dynamics is 148 c Get price

Fast

2020/02/11Results and Discussion. The sequences of experimental snapshots in Fig. 1 A – D highlight different freezing morphologies of a liquid hexadecane droplet after it impinges on a flat cold surface at various undercooling ΔT = Tm − Ts; Tm = 18 C is the melting temperature of the liquid, and Ts is the temperature of the substrate. Get price

Micro

2009/08/20In Izumida et al. ( 2005 ), O/W emulsion is produced on an apertured silicon substrate in a cross-flow channel of small gap (500 μm), where different viscosities and velocity of continuous phase fluid are tested. Smaller droplet size and higher productivity are achieved through the enhancement. Get price

APS Physics

2020/11/22New fluid dynamics research reveals why social distancing alone doesn't necessarily prevent infection indoors and how to detect COVID-19 super-spreaders. VIRTUAL MEETING (CST), November 22, 2020 — Researchers who study the physics of fluids are learning why certain situations increase the risk that droplets will transmit diseases like COVID-19. Get price

Unsteady sheet fragmentation: droplet sizes and speeds

For continuous droplet ejection throughout unsteady sheet fragmentation, a single image cannot capture the size and speed of all droplets ejected. When using sequences of frames (Yarin Weiss Reference Yarin and Weiss 1995 ), if the time difference between two consecutive frames is too large, rapidly moving drops are missed. Get price

Effect of Geometry Configuration on the Merged Droplet

2019/06/29The droplet technique mainly uses the interaction between shear force and surface tension to divide the continuous fluid into droplets. Compared to continuous flow technology, it has many incomparable advantages, such as small volume of droplets, rapid response, high dimensional controllability, low cost and so on (Zhu and Wang 2017 ; Zhang et al. 2015b ). Get price

Mechanistic Models for Droplet Formation and Breakup

2009/02/04Mechanistic models are created to predict the smallest droplet or bubble of a low concentration, inviscid, dispersed fluid that can be formed by shear from the continuous fluid (or droplet impact on a wall) and the largest Get price

Continuous droplet interface crossing encapsulation (cDICE

We report on a continuous droplet interface crossing encapsulation (cDICE) technique for the high-yield production of microscopic vesicles tunable in size and content. Overcoming some of the current technique limitations, such a Get price

Effects of viscosity, interfacial tension, and flow geometry on

2013/08/06The pressure buildup in the continuous channel due to the obstruction created by the dispersed fluid reaches a critical point and enables the continuous fluid to then create a droplet. For larger channel widths (smaller values of Γ ), the increase in the continuous and dispersed channel flow rates coupled with a constant capillary number results in increased droplet volumes. Get price

A review on microdroplet generation in microfluidics

2021/04/10Micro-nanofluidic technology is widely used in food safety testing, drug screening, new material synthesis and bioengineering. Droplet microfluidic technology is an important branch of micro-nanofluidic technology. The microdroplet technology can produce high-throughput monodisperse droplets. The droplet technology overcomes many problems of continuous flow, such as small Get price

APS Physics

2020/11/22New fluid dynamics research reveals why social distancing alone doesn't necessarily prevent infection indoors and how to detect COVID-19 super-spreaders. VIRTUAL MEETING (CST), November 22, 2020 — Researchers who study the physics of fluids are learning why certain situations increase the risk that droplets will transmit diseases like COVID-19. Get price

Micro

2009/08/20Micro-droplet formation from an aperture with a diameter of micrometers is numerically investigated under the cross-flow conditions of an experimental microchannel emulsification process. The process involves dispersing an oil phase into continuous phase fluid through a microchannel wall made of apertured substrate. Cross-flow in the microchannel is of non-Newtonian nature, which is included Get price

A review on microdroplet generation in microfluidics

2021/04/10Micro-nanofluidic technology is widely used in food safety testing, drug screening, new material synthesis and bioengineering. Droplet microfluidic technology is an important branch of micro-nanofluidic technology. The microdroplet technology can produce high-throughput monodisperse droplets. The droplet technology overcomes many problems of continuous flow, such as small Get price

Dynamic behaviour of buoyant high viscosity droplets rising in

2015/08/04The smallest droplets (0.5–2 mm) rise in steady vertical paths, where for the smallest droplet (0.5 mm) the flow field, as well as the terminal velocity, can be described by the Taylor and Acrivos approximate solution, despite the Get price

Droplet Control Based on Pinning and Substrate Wettability

2021/04/05The color code reflects the value of Hmax for each set of parameters. The empty circles indicate that the droplet remains pinned (on the red substrate) for any value of H ≥ 1.0σ. Each plot refers to droplets of different sizes, namely, N = 1120 (a), N = 10,080 (b), and N = 50,400 (c) beads. High Resolution Image. Get price

Numerical simulation of rising droplets in liquid–liquid systems

2014/12/01Fluid dynamics of a single droplet is governed by physical properties of the system and the size of the droplet. Relatively small droplets remain spherical and reach their terminal rise velocity after a short period of acceleration. Increasing the droplet diameter leads to higher terminal velocities. Get price

Physics

2021/05/21The COVID-19 pandemic has focused attention on the respiratory droplets produced by breathing, coughing, and singing. Numerical simulations of a cough now show [] that in cooler, more humid air, these droplets first grow before evaporating and shrinking—they don't continuously evaporate, as previous research has suggested. Get price

Respiratory droplet

Respiratory droplets are produced naturally as a result of breathing, speaking, sneezing, coughing, or vomiting, so they are always present in our breath, but speaking and coughing increases their number. Droplet sizes range from 1 m to 1000 m, and in typical breath there are around 100 droplet Get price

Droplet fragmentation: 3D imaging of a previously unidentified

2015/02/17Fluid displacement processes in carbonate rocks are important because they host over 50% of the world's hydrocarbon reserves and are aquifers supplying water to one quarter of the global population. A previously unidentified pore-scale fluid displacement event, droplet fragmentation, is described that occurs during the flow of two immiscible fluids specifically in carbonate rocks. The Get price

Droplet collisions of water and milk in a spray with Langevin

2019/05/01Final powder produced in a spray dryer depends on the droplet collision dynamics and therefore on the processes of coalescence and breakup. Eulerian-Lagrange spray model with Direct Simulation Monte Carlo (DSMC) and a turbulent disper- sion model, are used to efficiently describe and investigate droplet collisions. Get price

Micro Droplet Formation towards Continuous Nanoparticles

It was shown that the droplet size can be reduced from 185 15 m for the smallest flow rate of oil phase (0.2 mL/h) to 110 10 m for the highest flow rate of oil phase (1.5 mL/h). In the case of the aqueous phase ( Figure 7 C), an increase of the flow rate causes an increase of the formed droplet size from 80 5 m up to 90 8 m. Get price

Mechanistic Models for Droplet Formation and Breakup

2009/02/04Mechanistic models are created to predict the smallest droplet or bubble of a low concentration, inviscid, dispersed fluid that can be formed by shear from the continuous fluid (or droplet impact on a wall) and the largest droplet,, Get price

Dynamics of viscoelastic fluid droplet under very low interfacial

2014/10/11For a droplet carried by a continuous fluid through the channel, Ahn et al. claimed that the droplet translation speed V was size dependent such that the smallest droplets had velocities V ≈ 2U, whereas large droplets hadV ≈ U. Get price

Three

2013/01/14The recoiling of both the dispersed fluid back into the side channel and the tail of the newly generated droplet gives the continuous fluid more space to flow, leading to the sudden drop of p cu. Also, it can be seen that the pressure of the dispersed phase p d is slightly lower at this time period than its value in other stages. Get price

Passive and active droplet generation with microfluidics: a

A transitional regime occurs between squeezing and dripping, where the emerging droplet blocks the continuous-phase fluid partially and temporarily during its formation. Due to the partial blocking, the breakup dynamics is 148 c Get price

Dynamics of viscoelastic fluid droplet under very low interfacial

2014/10/11Droplets of viscoelastic fluid were generated in silicone oil using a microfluidic T-junction device, and their intrinsic dynamics were studied. The viscoelastic fluid used was a dilute aqueous solution of cetyltrimethylammonium chloride (CTAC) with sodium salicylate (NaSal) at the same mass concentration as CTAC. The surfactant greatly lowered the interfacial tension between the silicone oil Get price

Respiratory droplet

Respiratory droplets are produced naturally as a result of breathing, speaking, sneezing, coughing, or vomiting, so they are always present in our breath, but speaking and coughing increases their number. Droplet sizes range from 1 m to 1000 m, and in typical breath there are around 100 droplet Get price

Fluid dynamics and mass transfer at single droplets in liquid

2014/04/01Starting point in Fig. 1 is a single droplet immersed in an ambient quiescent liquid which rises or falls according to the forces exerted at the interface of the droplet. In the case without additional mass transfer, see Section 2, the droplet velocity only depends on the fluid dynamic behaviour. Get price

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