Characteristics of Liquid Flow in Microchannels at very Low Reynolds Numbers

Zhang, Xiwen; He, Feng; Hao, Pengfei; Gao, Ye; Sun, Liang; Wang, Xiaoqi; Xu, Jinkai

doi:10.1002/ceat.201500743

Cited by 7 publications

(6 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, researchers have been seeking to fabricate effective microstructure devices that can operate using as low of a pressure drop as possible. Despite its importance, the number of reported studies on liquid–liquid two-phase pressure drop in microchannels has been so far very limited. ,,,,,,,, These studies have observed that the pressure drop is most highly influenced by the flow patterns and the velocity and properties of the fluids, as well as by the size and roughness of the channels used. Before elaborating on the findings of different researchers, note that, to measure the pressure drop of a two-phase system, a differential pressure transducer is usually used.…”

Section: Pressure Dropmentioning

confidence: 99%

“…The process in microdevices involves the flow of different fluids in microchannels whose dimensions vary from submicrometers to submillimeters. The flow in the microscale is not subjected to the force of gravity but rather is dependent on the viscous, surface tension, and inertia forces, which results in the formation of laminar flow. − The relationship between these forces is presented in the form of dimensionless numbers to allow a better understanding of the interplay phenomena. , These characteristic features of the microchannels result in improved heat and mass exchange rates with a shorter time and a tiny size, compared to those in the traditional contactors. , However, several studies have also noted that the flow in microchannels introduces new confrontations, in terms of the hydrodynamics of the multiphase process. − …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Review on the Hydrodynamics of the Liquid–Liquid Two-Phase Flow in the Microchannels

Al-Azzawi

Mjalli

Husain

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The ability of small and microchannels to enhance mass transfer, reduce diffusional limitations, and create a safer process has made them the best choice for process intensification. This study provides a review of the available experimental and computational literature on the hydrodynamics of liquid−liquid two-phase flow in microscale, namely, flow regimes, pressure drop, and flow structure. When two immiscible liquids flow in small channels, various flow patterns can be observed, with the development of those patterns being influenced by several parameters, such as the geometry of the mixing junction and channel, the channel material, the fluids properties, and the orientation of the flow. As part of the flow patterns observations and measurement, the velocity fields and internal circulation reported in the literature were reviewed in the context of the microparticle velocimetry (μPIV) implementation. Also, relevant to our study is the literature outlining, pressure drop, and the available models that have been used to predict it. These models are discussed in detail with special reference to flow patterns and fluids viscosities. Moreover, the numerical studies results using computational fluid dynamics (CFD) have also been reviewed and discussed, in terms of the validity of the simulation and the different parameters affecting slug formation and flow patterns. Each section of the discussion also points out the gaps in the research and proposes future work that could further develop the technology under a review of liquid−liquid two-phase flow in microchannels.

show abstract

Section: Pressure Dropmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Review on the Hydrodynamics of the Liquid–Liquid Two-Phase Flow in the Microchannels

Al-Azzawi

Mjalli

Husain

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Many achievements have been obtained regarding investigating flow field and the transition from laminar to turbulent flow in microchannels with micro-PIV. For example, Zhang et al [27] conducted experiments to research flow characteristics of deionized water and kerosene in microchannels with diameters ranging from 50 to 254 μm under very low Reynolds number conditions (10−5<Re<10−2). Micro-PIV was applied to measure the velocity distribution inside the microchannels and the result was in strong agreement with the value calculated by the Navier–Stokes equation.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on the Flow Characteristics within Hydrodynamic Entrance Regions in Microchannels

Huang

2019

Micromachines

View full text Add to dashboard Cite

Flow characteristics within entrance regions in microchannels are important due to their effect on heat and mass transfer. However, relevant research is limited and some conclusions are controversial. In order to reveal flow characteristics within entrance regions and to provide empiric correlation estimating hydrodynamic entrance length, experimental and numerical investigations were conducted in microchannels with square cross-sections. The inlet configuration was elaborately designed in a more common pattern for microdevices to diminish errors caused by separation flow near the inlet and fabrication faults so that conclusions which were more applicable to microchannels could be drawn. Three different microchannels with hydraulic diameters of 100 μm, 150 μm, and 200 μm were investigated with Reynolds (Re) number ranging from 0.5 to 50. For the experiment, deionized water was chosen as the working fluid and microscopic particle image velocimetry (micro-PIV) was adopted to record and analyze velocity profiles. For numerical simulation, the test-sections were modeled and incompressible laminar Navier–Stokes equations were solved with commercial software. Strong agreement was achieved between the experimental data and the simulated data. According to the results of both the experiments and the simulations, new correlations were proposed to estimate entrance length. Re numbers ranging from 12.5 to 15 was considered as the transition region where the relationship between entrance length and Re number converted. For the microchannels and the Reynolds number range investigated compared with correlations for conventional channels, noticeable deviation was observed for lower Re numbers (Re < 12.5) and strong agreement was found for higher Re numbers (Re > 15).

show abstract

“…This change in local shear rate at wall leads to slip flow which depends upon the surface energy of the solid-liquid interface and other operational parameters like pressure drop [7], Reynolds No. [8] etc. and also in the thermal properties [9].…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamics (MHD) Induced Slip Flow of a Non-Newtonian Fluid through Circular Microchannels

2022

View full text Add to dashboard Cite

The present numerical analysis reveals the nature of non-Newtonian fluid flow through circular microchannels under slip boundary conditions. The power law has been used for the simulation of the fluid flow, which considers a steady, laminar, incompressible non-Newtonian fluid acted upon by a constant, externally applied magnetic field. The flow is axisymmetric and slip boundary conditions are applied in the near wall. A constant magnetic flux has been applied on the wall boundary to analyze the effect of magnetic field on Xanthan solution in formic acid, a type of non-Newtonian fluid having electrical conductivity. Using control volume method of finite difference scheme, a set of dimensionless governing differential equations defining the behavior of the fluid flow in the microchannel under an externally applied magnetic field, has been solved using slip boundary conditions to understand the effect of magnetic field on slip induced flow of non-Newtonian fluids. The results have depicted that the magnetic field affects both the centerline velocity and slip velocity but it is more prominent for the centerline velocities. The main objective of this research is to study the flow of non-Newtonian fluid, Xanthan through a circular microchannel and its corresponding behavior when flow boundary conditions are applied to interpret the characteristics under an externally applied magnetic field. The results obtained from this present study will find its application in the area of the flow of ferrofluids and biofluids. HIGHLIGHTS Most of the bio fluids and ferrofluids are non-Newtonian in nature and it is required to control these fluids when they pass through microchannels of modern devices Analysis conducted to find out the flow behaviour of non-Newtonian fluids through circular microchannels when they are exposed to externally applied magnetic fields Slip flow occurs in the fluid flow and an externally applied magnetic field controls the flow patterns by affecting slip velocity and centerline velocity which introduces extra flow in the microchannel. The results are helpful for better understanding of the flow of ferrofluids and bio fluids through circular microchannels GRAPHICAL ABSTRACT

show abstract

Characteristics of Liquid Flow in Microchannels at very Low Reynolds Numbers

Cited by 7 publications

References 35 publications

A Review on the Hydrodynamics of the Liquid–Liquid Two-Phase Flow in the Microchannels

A Review on the Hydrodynamics of the Liquid–Liquid Two-Phase Flow in the Microchannels

Experimental and Numerical Investigations on the Flow Characteristics within Hydrodynamic Entrance Regions in Microchannels

Magnetohydrodynamics (MHD) Induced Slip Flow of a Non-Newtonian Fluid through Circular Microchannels

Contact Info

Product

Resources

About