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

【摘要】：目前,天然氣水合物熱物性參數的測量一般是基于時域信號測量�；陬l域信號測量原理,研發(fā)的3ω獨立探頭大大拓展了該方法的應用范圍。本文基于絲狀獨立探頭和膜狀獨立探頭,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法測量水合物熱導率、熱擴散率、探頭和水合物間界面熱阻。在理論分析上,分析獨立探頭結構尺寸對測量結果的影響。對于Pt絲線熱源傳感器主要是Pt絲端部效應,熱容效應和Pt絲長徑比對測量結果的影響。對于膜狀線熱源傳感器,分析鎳帶線寬和薄膜厚度對理論模型線熱源近似程度和薄膜內二維熱擴散效應的影響。在實驗上,利用Pt絲線熱源傳感器測量跨臨界CO_2的熱導率和熱擴散率。分析了跨臨界狀態(tài)下CO_2的熱導率隨溫度、壓力的變化關系。利用膜狀線熱源獨立探頭測量了-20℃~-3℃溫度范圍內甲烷水合物的熱導率和熱擴散率,與國內外學者的測量結果進行了比較。同時測量分析測試結構的界面熱阻在溫度范圍內的變化。本文還分別利用膜狀線熱源傳感器和Pt絲線熱源傳感器對比測量了CO_2水合物的熱導率和熱擴散率,驗證了兩種方法的一致性。利用分子動力學方法模擬了甲烷水合物的熱導率,并分析了分子間作用力對熱導率的影響。比較了模擬結果和實驗結果的差異,同時驗證實驗數據的可行性。
[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：2030495