圓管式壓電噴頭的液體分配
發(fā)布時間：2018-10-19 12:36
【摘要】：針對用于噴墨打印的圓管式壓電噴頭建立了計算模型,并且根據它的驅動特點選擇了合適的邊界條件。介紹了仿真軟件針對自由表面流動問題的計算原理。然后,以乙二醇水溶液為例,計算了壓電噴頭分配該溶液的分配過程;利用液滴成像系統獲取了不同時刻的液滴圖像,驗證了建立的模型和數值算法的正確性。最后,計算了壓電噴頭在不同輸入位移、不同黏度以及不同表面張力下的液體分配過程。仿真結果顯示:液體分配性能與激勵位移密切相關,在72.5mN/m的表面張力作用下,10nm的輸入位移很難分配黏度為4.0mPa·s的液體,而15nm的輸入位移在分配黏度為4.0mPa·s液體時卻能夠產生衛(wèi)星液滴。因此,對于某種液體尋找一個合適的激勵條件非常重要,過小的激勵產生不了液滴,過大的激勵則會產生較大甚至多個衛(wèi)星液滴;增大黏度會延緩或阻滯液滴形成過程,增大表面張力卻能加快液滴形成過程。本文的計算方法對于研制新式噴頭或者研究噴頭的噴射能力均具有指導意義。
[Abstract]:The calculation model of the tubular piezoelectric nozzle used for inkjet printing is established, and the appropriate boundary conditions are selected according to its driving characteristics. The principle of simulation software for free surface flow is introduced. Then, the distribution process of the solution is calculated by taking the ethylene glycol aqueous solution as an example, and the droplet images at different times are obtained by using the droplet imaging system, which verifies the correctness of the established model and the numerical algorithm. Finally, the liquid distribution process of piezoelectric nozzle under different input displacement, different viscosity and different surface tension is calculated. The simulation results show that the performance of liquid distribution is closely related to the excitation displacement. Under the action of surface tension of 72.5mN/m, the input displacement of 10nm is difficult to distribute the liquid with viscosity of 4.0mPa s. The input displacement of 15nm can produce satellite droplets when the viscosity is distributed to 4.0mPa s liquid. Therefore, it is very important for a certain liquid to find a suitable excitation condition, too small an excitation can not produce droplets, too large an incentive will produce larger or more satellite droplets; increasing viscosity will delay or block the formation of droplets. Increasing surface tension can accelerate the droplet formation process. The calculation method in this paper is of guiding significance for the development of new nozzle or the study of spray capability of nozzle.
【作者單位】： 哈爾濱工業(yè)大學機器人技術與系統國家重點實驗室;
【基金】：國家自然科學基金資助項目(No.51105116) 中央高�；究蒲袠I(yè)務費專項資金資助項目(No.HIT.IBRSEM.2013038)
【分類號】：TN384;O35
，
本文編號：2281130
[Abstract]:The calculation model of the tubular piezoelectric nozzle used for inkjet printing is established, and the appropriate boundary conditions are selected according to its driving characteristics. The principle of simulation software for free surface flow is introduced. Then, the distribution process of the solution is calculated by taking the ethylene glycol aqueous solution as an example, and the droplet images at different times are obtained by using the droplet imaging system, which verifies the correctness of the established model and the numerical algorithm. Finally, the liquid distribution process of piezoelectric nozzle under different input displacement, different viscosity and different surface tension is calculated. The simulation results show that the performance of liquid distribution is closely related to the excitation displacement. Under the action of surface tension of 72.5mN/m, the input displacement of 10nm is difficult to distribute the liquid with viscosity of 4.0mPa s. The input displacement of 15nm can produce satellite droplets when the viscosity is distributed to 4.0mPa s liquid. Therefore, it is very important for a certain liquid to find a suitable excitation condition, too small an excitation can not produce droplets, too large an incentive will produce larger or more satellite droplets; increasing viscosity will delay or block the formation of droplets. Increasing surface tension can accelerate the droplet formation process. The calculation method in this paper is of guiding significance for the development of new nozzle or the study of spray capability of nozzle.
【作者單位】： 哈爾濱工業(yè)大學機器人技術與系統國家重點實驗室;
【基金】：國家自然科學基金資助項目(No.51105116) 中央高�；究蒲袠I(yè)務費專項資金資助項目(No.HIT.IBRSEM.2013038)
【分類號】：TN384;O35
，
本文編號：2281130
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