本文選題：水合物 + 熱物性　； 參考：《中國石油大學(xué)(華東)》2015年碩士論文

【摘要】：目前,天然氣水合物熱物性參數(shù)的測(cè)量一般是基于時(shí)域信號(hào)測(cè)量�；陬l域信號(hào)測(cè)量原理,研發(fā)的3ω獨(dú)立探頭大大拓展了該方法的應(yīng)用范圍。本文基于絲狀獨(dú)立探頭和膜狀獨(dú)立探頭,首先在低溫高壓下合成天然氣水合物和二氧化碳水合物,然后利用3ω法測(cè)量水合物熱導(dǎo)率、熱擴(kuò)散率、探頭和水合物間界面熱阻。在理論分析上,分析獨(dú)立探頭結(jié)構(gòu)尺寸對(duì)測(cè)量結(jié)果的影響。對(duì)于Pt絲線熱源傳感器主要是Pt絲端部效應(yīng),熱容效應(yīng)和Pt絲長(zhǎng)徑比對(duì)測(cè)量結(jié)果的影響。對(duì)于膜狀線熱源傳感器,分析鎳帶線寬和薄膜厚度對(duì)理論模型線熱源近似程度和薄膜內(nèi)二維熱擴(kuò)散效應(yīng)的影響。在實(shí)驗(yàn)上,利用Pt絲線熱源傳感器測(cè)量跨臨界CO_2的熱導(dǎo)率和熱擴(kuò)散率。分析了跨臨界狀態(tài)下CO_2的熱導(dǎo)率隨溫度、壓力的變化關(guān)系。利用膜狀線熱源獨(dú)立探頭測(cè)量了-20℃~-3℃溫度范圍內(nèi)甲烷水合物的熱導(dǎo)率和熱擴(kuò)散率,與國內(nèi)外學(xué)者的測(cè)量結(jié)果進(jìn)行了比較。同時(shí)測(cè)量分析測(cè)試結(jié)構(gòu)的界面熱阻在溫度范圍內(nèi)的變化。本文還分別利用膜狀線熱源傳感器和Pt絲線熱源傳感器對(duì)比測(cè)量了CO_2水合物的熱導(dǎo)率和熱擴(kuò)散率,驗(yàn)證了兩種方法的一致性。利用分子動(dòng)力學(xué)方法模擬了甲烷水合物的熱導(dǎo)率,并分析了分子間作用力對(duì)熱導(dǎo)率的影響。比較了模擬結(jié)果和實(shí)驗(yàn)結(jié)果的差異,同時(shí)驗(yàn)證實(shí)驗(yàn)數(shù)據(jù)的可行性。
[Abstract]:At present, the measurement of gas hydrate thermal properties is usually based on time domain signal measurement. Based on the principle of signal measurement in frequency domain, the developed 3 蠅 independent probe greatly expands the application range of this method. In this paper, gas hydrate and carbon dioxide hydrate are synthesized at low temperature and high pressure based on filamentary and membrane independent probes. Then the thermal conductivity, thermal diffusivity and interfacial thermal resistance between probe and hydrate are measured by 3 蠅 method. In the theoretical analysis, the influence of the structure size of the independent probe on the measurement results is analyzed. For Pt wire heat source sensor, it is mainly the end effect of Pt wire, the effect of heat capacity and the influence of length to diameter ratio of Pt wire. For the film linear heat source sensor, the influence of the wire width and film thickness on the approximation of the linear heat source in the theoretical model and the two-dimensional thermal diffusion effect in the film are analyzed. The thermal conductivity and thermal diffusivity of transcritical COs _ 2 were measured by Pt wire heat source sensor. The relationship between the thermal conductivity of COSP _ 2 and the temperature and pressure is analyzed in the transcritical state. The thermal conductivity and thermal diffusivity of methane hydrate in the temperature range of -20 鈩，

本文編號(hào)：2030495