微流控振蕩器的設(shè)計(jì)與特性研究
發(fā)布時(shí)間：2018-09-06 17:18
【摘要】：微流控技術(shù)是一門主要研究微/納米量級(jí)結(jié)構(gòu)對(duì)微/納升體積流體進(jìn)行精確控制的科學(xué)。隨著微流控技術(shù)的不斷發(fā)展以及微流控芯片的復(fù)雜化,增加微流控技術(shù)的功能和實(shí)用性迫在眉睫,其關(guān)鍵就在于開發(fā)標(biāo)準(zhǔn)化、可擴(kuò)展和通用的控制系統(tǒng)以及交變流體驅(qū)動(dòng)源。流體控制的微流控振蕩器促使嵌入式非電氣控制系統(tǒng)的發(fā)展,提高了微流控系統(tǒng)的便捷性、可擴(kuò)展性和魯棒性,為微流控芯片邁入數(shù)字化領(lǐng)域打下基礎(chǔ)。本文以電路中的非穩(wěn)態(tài)多諧振蕩器為原型,利用微流控等效電路理論,設(shè)計(jì)并研究了一款流體驅(qū)動(dòng)的微流控振蕩器。該微流控振蕩器由流道和常閉閥對(duì)稱級(jí)聯(lián)而成,外部輔助裝置簡(jiǎn)單、可移植性強(qiáng)。1.利用微流控等效電路理論,對(duì)微流控系統(tǒng)中單向閥、常閉閥、流阻串并聯(lián)、流阻星三角變換以及復(fù)雜網(wǎng)絡(luò)的KVL、KCL進(jìn)行等效分析,證實(shí)了利用等效電路理論輔助設(shè)計(jì)微流控系統(tǒng)的方便、快捷和高效。2.利用COMSOL仿真平臺(tái),發(fā)展了一種微流控振蕩器的仿真技術(shù)。針對(duì)微流道流阻、流容、流感以及常閉閥的特性進(jìn)行了仿真研究,并與等效電路理論進(jìn)行對(duì)比,驗(yàn)證了仿真的可行性和準(zhǔn)確性,完備了微流控仿真技術(shù),為微流控振蕩器的數(shù)值模擬研究打下基礎(chǔ)。3.從微流控振蕩器的工作原理中得到該振蕩器工作頻率的相關(guān)參數(shù):常閉閥的內(nèi)置流容和反饋流阻。利用仿真軟件對(duì)微流控振蕩器的模型進(jìn)行模擬研究,主要研究了(1)微流控振蕩器的振蕩周期與流體入口流速、反饋流阻以及常閉閥閾值壓力的變化關(guān)系,(2)振蕩波形的上升沿、下降沿與入口流量和常閉閥的關(guān)系,(3)振蕩周期占空比與閥座的關(guān)系,最后(4)分析了微流控振蕩器的諧振頻率。研究結(jié)果表明,隨著入口流速的增加,振蕩周期減小;閥的閾值與振蕩周期呈線性關(guān)系,隨著常閉閥閥座的增寬或閥的寬長(zhǎng)比減小,周期變長(zhǎng);隨著反饋流阻的增大,周期變長(zhǎng);增大入口流速或減小常閉閥的入口流容可以縮短上升沿時(shí)間;振蕩器結(jié)構(gòu)的不對(duì)稱設(shè)計(jì)可以調(diào)節(jié)周期的占空比。另外,根據(jù)所得的微流控振蕩器的諧振頻率(196Hz)與工作頻率(0.02Hz),證實(shí)該模型的等效流感可以忽略。根據(jù)研究結(jié)果,可以按照不同的要求,設(shè)計(jì)出相應(yīng)的微流控振蕩器。
[Abstract]:Microfluidic technology is a science that focuses on the precise control of micro / nanostructured micro / nano volume fluids. With the development of microfluidic technology and the complication of microfluidic chip, it is urgent to increase the function and practicability of microfluidic technology. The key lies in developing standardized, extensible and universal control system and alternating fluid drive source. The fluid-controlled microfluidic oscillator promotes the development of embedded non-electrical control system, and improves the convenience, expansibility and robustness of the microfluidic system, which lays the foundation for the microfluidic chip to enter the digital field. In this paper, a fluid driven microfluidic oscillator is designed and studied using the theory of microfluidic equivalent circuit based on the unsteady multivibrator in the circuit. The microfluidic oscillator consists of a symmetrical cascade of flow channels and closed valves. The external auxiliary device is simple and portability is strong. 1. Based on the equivalent circuit theory of microfluidic system, the equivalent analysis of unidirectional valve, closed valve, series and parallel flow resistance, triangulation of flow resistance and KVL,KCL of complex network is carried out. It is proved that the design of microfluidic system with equivalent circuit theory is convenient, fast and efficient. A microfluidic oscillator simulation technology is developed using COMSOL simulation platform. The characteristics of microchannel flow resistance, flow volume, flu and closed valve are simulated, and compared with equivalent circuit theory, the feasibility and accuracy of simulation are verified, and the simulation technology of microfluidic control is completed. It lays a foundation for numerical simulation of microfluidic oscillator. From the operating principle of the microfluidic oscillator, the parameters related to the frequency of the oscillator are obtained: the built-in flow volume and the feedback flow resistance of the normally closed valve. The simulation software is used to simulate the model of the microfluidic oscillator. The relationship between the oscillation period of the microfluidic oscillator and the inlet velocity of the fluid, the feedback flow resistance and the threshold pressure of the closed valve is studied. (2) the rising edge of the oscillation waveform. The relationship between the descent edge and the inlet flow rate and the closed valve, (3) the relationship between the period duty cycle and the valve seat, and (4) the resonant frequency of the microfluidic oscillator is analyzed. The results show that the oscillation period decreases with the increase of inlet velocity, the threshold value of the valve is linearly related to the oscillation period, and the period becomes longer with the widening of the valve seat or the ratio of the width to length of the valve, and with the increase of the feedback flow resistance. The rising edge time can be shortened by increasing the inlet velocity or decreasing the inlet flow volume of the closed valve, and the period duty cycle can be adjusted by the asymmetric design of the oscillator structure. In addition, according to the resonant frequency (196Hz) and the operating frequency (0.02Hz) of the microfluidic oscillator, it is proved that the equivalent influenza of the model can be neglected. According to the research results, the corresponding microfluidic oscillator can be designed according to different requirements.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN752
本文編號(hào)：2227021
[Abstract]:Microfluidic technology is a science that focuses on the precise control of micro / nanostructured micro / nano volume fluids. With the development of microfluidic technology and the complication of microfluidic chip, it is urgent to increase the function and practicability of microfluidic technology. The key lies in developing standardized, extensible and universal control system and alternating fluid drive source. The fluid-controlled microfluidic oscillator promotes the development of embedded non-electrical control system, and improves the convenience, expansibility and robustness of the microfluidic system, which lays the foundation for the microfluidic chip to enter the digital field. In this paper, a fluid driven microfluidic oscillator is designed and studied using the theory of microfluidic equivalent circuit based on the unsteady multivibrator in the circuit. The microfluidic oscillator consists of a symmetrical cascade of flow channels and closed valves. The external auxiliary device is simple and portability is strong. 1. Based on the equivalent circuit theory of microfluidic system, the equivalent analysis of unidirectional valve, closed valve, series and parallel flow resistance, triangulation of flow resistance and KVL,KCL of complex network is carried out. It is proved that the design of microfluidic system with equivalent circuit theory is convenient, fast and efficient. A microfluidic oscillator simulation technology is developed using COMSOL simulation platform. The characteristics of microchannel flow resistance, flow volume, flu and closed valve are simulated, and compared with equivalent circuit theory, the feasibility and accuracy of simulation are verified, and the simulation technology of microfluidic control is completed. It lays a foundation for numerical simulation of microfluidic oscillator. From the operating principle of the microfluidic oscillator, the parameters related to the frequency of the oscillator are obtained: the built-in flow volume and the feedback flow resistance of the normally closed valve. The simulation software is used to simulate the model of the microfluidic oscillator. The relationship between the oscillation period of the microfluidic oscillator and the inlet velocity of the fluid, the feedback flow resistance and the threshold pressure of the closed valve is studied. (2) the rising edge of the oscillation waveform. The relationship between the descent edge and the inlet flow rate and the closed valve, (3) the relationship between the period duty cycle and the valve seat, and (4) the resonant frequency of the microfluidic oscillator is analyzed. The results show that the oscillation period decreases with the increase of inlet velocity, the threshold value of the valve is linearly related to the oscillation period, and the period becomes longer with the widening of the valve seat or the ratio of the width to length of the valve, and with the increase of the feedback flow resistance. The rising edge time can be shortened by increasing the inlet velocity or decreasing the inlet flow volume of the closed valve, and the period duty cycle can be adjusted by the asymmetric design of the oscillator structure. In addition, according to the resonant frequency (196Hz) and the operating frequency (0.02Hz) of the microfluidic oscillator, it is proved that the equivalent influenza of the model can be neglected. According to the research results, the corresponding microfluidic oscillator can be designed according to different requirements.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN752
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