【摘要】：共混法是制備相變儲能材料的一種常用方法,通過將相變材料和支撐材料組分在熔融狀態(tài)下進(jìn)行機(jī)械共混,從而得到組分均勻的儲能材料,由于共混制備工藝簡單,生產(chǎn)成本比較低,近年來得到研究人員的廣泛重視。目前的共混通常是通過簡單混合實(shí)現(xiàn)的,但是在混合過程中難以改變材料結(jié)構(gòu)特征,從而難以使制備材料的性能得到根本的提升,通過改變材料混合時(shí)的場環(huán)境(熱場、真空場和超聲場等)使材料的結(jié)構(gòu)特征發(fā)生改變,進(jìn)而提升材料的性能是在機(jī)械共混的基礎(chǔ)之上逐步發(fā)展起來的制備方法。本文設(shè)計(jì)并搭建了一套基于超聲輔助真空作用的混煉裝置,并用于石墨烯納米片/聚乙二醇(GNPs/PEG)相變材料的制備,通過多物理場耦合仿真分析確定出制備裝置機(jī)械部分的參數(shù),并通過FLUENT軟件模擬了不同條件下的混合特性,并與實(shí)驗(yàn)結(jié)果進(jìn)行了比對。本文的主要內(nèi)容如下:1.利用UG設(shè)計(jì)實(shí)驗(yàn)裝置的腔體部分,在考慮復(fù)合場作用條件下腔體和蓋口處密封圈所能承受的壓強(qiáng)的基礎(chǔ)上,通過ANSYS workbench進(jìn)行多物理場耦合仿真,確定腔體內(nèi)徑、壁厚等關(guān)鍵參數(shù)。2.在結(jié)構(gòu)設(shè)計(jì)的基礎(chǔ)上,搭建一套超聲輔助真空混煉裝置,根據(jù)實(shí)驗(yàn)要求對超聲波發(fā)生器,真空泵和熱電偶等裝置選型,并搭建起一套滿足多種材料制備工藝需求的實(shí)驗(yàn)系統(tǒng)。3.在GAMBIT繪制流體網(wǎng)格的基礎(chǔ)上,利用FLUENT軟件通過動網(wǎng)格的方法模擬復(fù)合場下復(fù)合相變材料的流變性能,并分析不同場強(qiáng)(超聲波功率和真空度等)對材料混合效果的影響。4.通過制備石墨烯納米片/聚乙二醇(GNPs/PEG)復(fù)合材料,測試實(shí)驗(yàn)裝置的共混效果,在實(shí)驗(yàn)過程中,通過選取不同的實(shí)驗(yàn)條件,比較不同實(shí)驗(yàn)條件下對復(fù)合材料熱穩(wěn)定性、抗熱變形性和熱導(dǎo)率等指標(biāo)的影響,并與仿真結(jié)果進(jìn)行比較。
[Abstract]:Blending is a common method for preparing phase change energy storage materials. By mechanical blending of phase change materials and support materials in molten state, homogeneous energy storage materials can be obtained. The cost of production is relatively low, in recent years, researchers pay more attention to it. At present, blending is usually achieved by simple mixing, but it is difficult to change the structural characteristics of the materials during mixing process, so it is difficult to improve the properties of the prepared materials fundamentally, by changing the field environment (thermal field) when the materials are mixed. The vacuum field and ultrasonic field make the structure of the material change and then improve the properties of the material. The preparation method is developed step by step on the basis of mechanical blending. In this paper, a mixing device based on ultrasonic assisted vacuum is designed and built, and it is used in the preparation of graphene nanochip / polyethylene glycol (GNPs/PEG) phase change material. The parameters of the mechanical part of the preparation device are determined by multi-physical field coupling simulation. The mixing characteristics under different conditions are simulated by FLUENT software, and the results are compared with the experimental results. The main contents of this paper are as follows: 1. The cavity part of the experimental device is designed by using UG. On the basis of considering the pressure of the cavity and the sealing ring at the cover under the action of the composite field, the coupling simulation of the multi-physical field is carried out through ANSYS workbench to determine the cavity inner diameter. Key parameters such as wall thickness. 2. On the basis of structural design, a set of ultrasonic assisted vacuum mixing device was built, and the ultrasonic generator, vacuum pump and thermocouple were selected according to the experimental requirements. And set up a set of experimental system to meet the needs of various materials preparation process. 3. On the basis of drawing fluid mesh by GAMBIT, the rheological properties of composite phase change material under composite field are simulated by FLUENT software through dynamic grid method, and the influence of different field intensity (ultrasonic power and vacuum degree etc.) on material mixing effect is analyzed. 4. By preparing graphene nanosheet / polyethylene glycol (GNPs/PEG) composite, the blending effect of the experimental device was tested. In the process of the experiment, the thermal stability of the composite was compared under different experimental conditions by selecting different experimental conditions. The effects of thermal deformation resistance and thermal conductivity are compared with the simulation results.
【學(xué)位授予單位】：陜西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB34

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