本文選題：多孔材料 + 空腔效應　； 參考：《中國礦業(yè)大學》2015年碩士論文

【摘要】：目前多孔材料在輻射方面的研究還不夠深入,為了明確輻射在多孔材料表面的傳熱特性,得到不同孔參數的多孔材料輻射能力的評價方法,指導工業(yè)生產中多孔材料的設計,本文對多孔材料的輻射特性進行研究,通過明晰多孔材料不同參數對其輻射的影響規(guī)律,揭示多孔材料腔體的“空腔效應”,進一步完善輻射理論,對“空腔效應”提供借鑒。本文搭建了多孔材料輻射實驗裝置,研究了單孔材料,簡單多孔材料以及復雜多孔材料“空腔效應”的影響規(guī)律。實驗結果表明,表面發(fā)射率的變化基本不受材料溫度、開孔形狀、開孔分布的形狀、孔深度分布情況這4個參數的影響;表面發(fā)射率隨著孔徑的增大呈現先增長后下降的趨勢;材料表面發(fā)射率隨著孔深度的增加,呈現先增長再平穩(wěn)的趨勢;隨著深徑比的增大,表面發(fā)射率增大;隨著孔朝向與表面法線夾角的余弦值的減小,表面發(fā)射率的平均值逐漸降低;材料表面發(fā)射率隨著孔第二層深度的增加,呈現先增長再平穩(wěn)的趨勢;材料表面發(fā)射率隨著孔第二層孔直徑的增加,整體發(fā)射率增長呈現先緩慢增長再急速增長的趨勢。根據實驗數據對單孔材料、簡單多孔材料進行了公式擬合,并將多孔材料的實驗結果與計算值比較,驗證了公式的適用性。
[Abstract]:At present, the research on radiation of porous materials is not deep enough. In order to clarify the heat transfer characteristics of radiation on the surface of porous materials, the evaluation method of radiation capacity of porous materials with different pore parameters is obtained to guide the design of porous materials in industrial production. In this paper, the radiation characteristics of porous materials are studied. By clarifying the influence of different parameters of porous materials on their radiation, the "cavity effect" of porous material cavity is revealed, and the radiation theory is further improved, which can be used as a reference for "cavity effect". In this paper, an experimental apparatus for radiation of porous materials is set up, and the influence of single porous materials, simple porous materials and complex porous materials on the "cavity effect" is studied. The experimental results show that the change of surface emissivity is not affected by the four parameters of material temperature, hole shape, hole distribution and hole depth distribution, and the surface emissivity increases first and then decreases with the increase of pore size. With the increase of hole depth, the surface emissivity of the material increases first and then steadily; with the increase of aspect ratio, the surface emissivity increases; with the decrease of cosine value of the angle between the hole orientation and the surface normal line, the surface emissivity increases with the increase of the ratio of depth to diameter. The average emissivity of the surface decreases gradually, the emissivity of the material increases first and then steadily with the increase of the depth of the second layer of the hole, and the emissivity of the material increases with the diameter of the second layer of the hole. Overall emissivity growth shows the trend of slow growth first and then rapid growth. According to the experimental data, the formula fitting of single porous material and simple porous material is carried out, and the applicability of the formula is verified by comparing the experimental results of the porous material with the calculated values.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.4

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本文編號：1913959