發(fā)布時(shí)間：2018-06-02 18:06

  本文選題：核磁共振成像 + 多孔介質(zhì)　； 參考：《Transactions of Nonferrous Metals Society of China》2016年05期

【摘要】：為了探測(cè)多孔介質(zhì)的內(nèi)部結(jié)構(gòu)及顆粒間流速分布,對(duì)飽和條件下的瓊脂球散體進(jìn)行核磁共振成像試驗(yàn),獲取了3種流量下的速度場(chǎng)圖像。同時(shí),為了確定多孔介質(zhì)的孔隙參數(shù),利用圖像處理技術(shù)獲取了其內(nèi)部結(jié)構(gòu)。結(jié)果表明:該多孔介質(zhì)的孔隙率為31.28%,其孔隙當(dāng)量直徑分布擬合曲線滿足高斯分布;流速場(chǎng)隨著流量的改變而變化且孔隙內(nèi)的流體為非均質(zhì)流;孔內(nèi)流速分布近似于拋物線狀,局部最大值位于中心附近;約一半的速度分量在0~1 cm/s之間;流量越大,低速度分量的頻率越低,而對(duì)于高速度分量,則恰恰相反。
[Abstract]:In order to detect the internal structure of porous media and the velocity distribution between particles, the magnetic resonance imaging (NMR) of Agar sphere particles under saturated conditions was carried out, and the velocity field images at three different flow rates were obtained. At the same time, in order to determine the pore parameters of porous media, the internal structure of porous media was obtained by image processing technology. The results show that the porosity of the porous medium is 31.28, the fitting curve of the pore equivalent diameter distribution satisfies the Gao Si distribution, the velocity field changes with the flow rate and the fluid in the pore is heterogeneous, and the velocity distribution in the pore is similar to parabola. The local maximum value is located near the center; about half of the velocity component is between 0 and 1 cm/s; the higher the flow rate, the lower the frequency of the low velocity component, while for the high velocity component, the opposite is true.
【作者單位】： 北京科技大學(xué)金屬礦山高效開采與安全教育部重點(diǎn)實(shí)驗(yàn)室;北京科技大學(xué)土木與環(huán)境工程學(xué)院;
【基金】：Project(51374035)supported by the National Natural Science Foundation of China Project(2012BAB08B02)supported by the National Science&Technology Pillar Program During the Twelfth Five-year Plan Period Project(NCET-13-0669)supported by the New Century Excellent Talents in University of Ministry of Education of China
【分類號(hào)】：TB383.4
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本文編號(hào)：1969688