Experimental and Numerical Investigation of a Novel Spiral Micromixer with Sinusoidal Channel Walls

Bahrami, Dariush; Bayareh, Morteza

doi:10.1002/ceat.202100368

Cited by 42 publications

(10 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Variation of (a) mixing index as a function of Re , (b) pressure drop as a function of Re for SGM, SDM-8T, and RRGM, and (c) mixing index as a function of pressure drop for SGM, SDM-8T, RRGM, and previous works. ,,, …”

Section: Resultsmentioning

confidence: 91%

“…Active micromixers enhance the mixing efficiency by driving the liquid with some external energy fields, such as electric field, − magnetic field, , piezoelectrical field, , and acoustic waves. − Generally, active micromixers have the advantage of high controllability, but they are often difficult to fabricate and integrate. In contrast, passive micromixers mainly depend on innovative geometric structures inside the channel to enhance the mixing efficiency. − Based on distinct inherent mixing mechanisms, passive micromixers may be further divided into lamination, , focusing mixing streams, , split-and-recombine, − chaotic advection, − and droplet mixing. , …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mixing Enhancement in a Chaotic Micromixer with Reversed Ridges and Grooves

Chen,

Lin,

Pan

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A novel micromixer named reversed ridges and grooves micromixer (RRGM) with chaotic and passive characteristics is devised and analyzed numerically. Compared with a slanted grooves micromixer (SGM), a barrier-embedded micromixer (BEM), and a circulation-disturbance micromixer (CDM), the RRGM achieves an excellent mixing performance for Reynolds number (Re) in a range of 0.01 ≤ Re ≤ 100, especially at Re ≤ 10. The mixing index is adopted as the objective function to evaluate the mixing performance. The Lagrangian particle tracking method is employed to further observe the chaotic behavior in the mixing process and to explain the mechanism of chaotic mixing. The combination of ridges and grooves actively accelerates the stretching and folding of fluids, forming a pair of continuously changing asymmetrical hyperbolic vortices along the entire mixing channel. Three design parameters related to the performance, namely, slanted angle of ridges, slanted angle of grooves, and height of groove and ridge, are explored to optimize the mixing performance. The slanted angle of 45°is ascertained as the optimal value for both the ridges and grooves. At Re ≤ 1, the height of ridges and grooves of 30 μm is the best choice, whereas at Re ≥ 10, a higher mixing index is obtained by increasing the height of grooves and ridges, which is attributed to a greater flow disturbance from the inertial dominance.

show abstract

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Mixing Enhancement in a Chaotic Micromixer with Reversed Ridges and Grooves

Chen,

Lin,

Pan

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…In a spiral micromixer, fluids close to the inner boundary are pulled towards the outer boundary, and fluids close to the outer boundary come to the inner boundary due to centrifugal effects, the combined effects of these are responsible for the generation of Dean vortices. 56,57 Such behaviour can be seen in spiral micromixer until the spiral centre, and beyond this, fluids change the position. Figure 5 shows the mass contours of ethyl alcohol for G0 micromixer at plane 1, plane 2, plane 3, and plane 4 for Re values of 0.1, 1, 10, and 100.…”

Section: Resultsmentioning

confidence: 98%

Mixing characteristics and pressure drop analysis in a spiral micromixer

Tripathi

Patowari

Pati

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

In this work, numerical computations are performed to analyze the mixing characteristics and pressure drop in a spiral micromixer. The effects of variation in width and depth of the micromixer are investigated for Reynolds number ( Re) in the range of 0.1 ≤ Re≤100. Results are enumerated in terms of mass contours, streamlines, mixing index and pressure drop. It is observed that the designed spiral micromixer provides a better mixing for both low and high Re values, and moreover, the mixing index remains almost the same with the variation of the depth and width of the mixer for Re > 50. The mixing index first decreases with Re, reaches a minimum value, and thereafter again increases with a further increase in Re in the range of 0.1 ≤ Re≤50. For intermediate Reynolds number, a high mixing index is observed in micromixer having higher depth and lower width. Although the driving pressure force increases with the increase in Reynolds number, it decreases with the increase in width and depth of the micromixer.

show abstract

“…A fantype split and recombine micromixer was designed by Xia et al [13] where the cavity forms like a semicircular arc with an asymmetric thickness on either side. Change in the channel width intermittently, and observation of its effect on the mixing index was done by Bahrami et al [14].…”

Section: Nikhilesh Madapatimentioning

confidence: 99%

T‐Joint Micromixer Coupled with Deforming Diaphragm

Madapati

Arumuru

2022

Chem Eng & Technol

View full text Add to dashboard Cite

A novel active micromixer design involving an oscillating diaphragm is proposed. A simulation study is performed to determine the effect of diaphragm length, amplitude, and frequency of the oscillating diaphragm on the mixing index. The geometry is a simple T‐joint with an elongated channel for the outlet with a diaphragm on the outlet channel wall. The fluids at the inlets are similar in fluid properties with the same flow rate and diffusion constant. The mixing index saturates with increasing frequency and amplitude of oscillation for a given diaphragm length. The diaphragm's effectiveness was calculated based on the pressure difference between the diaphragm inlet and outlet zone. The effectiveness declined with an increase in the frequency of the diaphragm oscillation. An analytical expression is derived to find the effect of the frequency and amplitude of the diaphragm oscillation on the mixing index. This simple novel design may find wide applications in various industrial fields.

show abstract

Experimental and Numerical Investigation of a Novel Spiral Micromixer with Sinusoidal Channel Walls

Cited by 42 publications

References 30 publications

Mixing Enhancement in a Chaotic Micromixer with Reversed Ridges and Grooves

Mixing Enhancement in a Chaotic Micromixer with Reversed Ridges and Grooves

Mixing characteristics and pressure drop analysis in a spiral micromixer

T‐Joint Micromixer Coupled with Deforming Diaphragm

Contact Info

Product

Resources

About