作者：
Cao, JingzhiChen, XueyeLudong Univ
Sch Chem & Mat Sci 186 Middle Hongqi Rd Yantai 264025 Shandong Peoples R China Ludong Univ
Coll Transportat Yantai 264025 Shandong Peoples R China
Shape optimization of micromixers with cantor fractal structures on the top and bottom walls has been conducted using a combination of three-dimensional Navier-Stokes analysis, Machine Learning (ML), and multi-objecti...
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Shape optimization of micromixers with cantor fractal structures on the top and bottom walls has been conducted using a combination of three-dimensional Navier-Stokes analysis, Machine Learning (ML), and multi-objective genetic algorithm (MOGA) for both single and multi-objective optimization objectives. Numerical analysis has been systematically conducted employing two distinct working fluids, namely water and ethanol, while operating at a Reynolds number (Re) of unity (Re = 1). The optimization endeavor has been executed by manipulating two design variables that pertain to dimensionless geometric parameters. The single-objective optimization is centered on the selection of mixing effectiveness as the primary objective function, whereas the multi-objective optimization entails the consideration of two objective functions, specifically, the pressure drop and the mixing index at the exit. The Latin hypercube sampling (LHS) method is employed as an experimental design technique to systematically explore the parameter space within the design domain. It is utilized for the purpose of strategically selecting design points within this domain. Additionally, surrogate models for the objective functions are established through the application of ML. In the context of single-objective optimization, the Sequential Linear Programming (SLP) method is employed to iteratively derive the optimal objective function. Meanwhile, for multi-objective optimization, the Genetic Algorithm (GA) is applied to delineate the Pareto optimal frontier (POF) of the micromixer. Subsequently, K-means clustering is utilized as a technique for the purpose of classifying the optimized outcomes, followed by the selection of representative points within the solution space. In the context of single-objective optimization, it is observed that the micromixer featuring a cantor fractal structure exhibits a noteworthy enhancement in mixing efficiency, surpassing that of the reference design (RD) by a substant
CO2 laser processing technology is a low cost, simple and efficient processing method for fabrication of microfluidic chip on Poly(methyl methacrylate) (PMMA). In this paper, we study the influence of low power and lo...
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CO2 laser processing technology is a low cost, simple and efficient processing method for fabrication of microfluidic chip on Poly(methyl methacrylate) (PMMA). In this paper, we study the influence of low power and low speed of laser processing on the PMMA microchannel. Laser power was set from 5 to 15 W and laser traverse is set from 6 to 10 mm/s in the experiment. Though experiment results to compare the influence of laser processing parameters on the depth and width of microchannel. The suitable parameters are selected to process the microchannel on the PMMA plate. Finally, a PMMA microfluidic chip with cantor fractal structure is fabricated by the method of hot pressing bonding. The experiment results show that CO2 laser processing technology is a low cost, flexible and convenient method in the microfluidic chip processing.
A polystyrene (PS) microfluidic chip with cantor fractal structure is fabricated using CO2 laser system. We study the effects of laser power and laser traverse speed on the depth, width of PS microchannels. Laser powe...
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A polystyrene (PS) microfluidic chip with cantor fractal structure is fabricated using CO2 laser system. We study the effects of laser power and laser traverse speed on the depth, width of PS microchannels. Laser power was set from 6 to 14 W and laser traverse speed was set from 6 to 10 mm/s in the experiments. A number of experiments were carried out to find the appropriate parameters in the range of the set parameters for the CO2 laser machining of microchannels. Hot pressing bonding technology was used to integrate the PS cover plate and the PS substrate. The work shows that CO2 laser processing is a low cost, fast, convenient and high precision microfluidic chip processing method. The microfluidic chip with cantorfractal made of PS material can achieve better mixing effect. Using our method, we can process a minimum width of 20 mu m and a minimum depth of 15 mu m microchannel, which provides effective help to the micron level microchannels that we processed.
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