一种适用于提高采收率和流动可视化实验的均相和非均相孔隙微模型的新方法

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS Journal of Energy Resources Technology-transactions of The Asme Pub Date : 2023-03-02 DOI:10.1115/1.4057032
Najrul Haque, Anugrah Singh, U. Saha
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引用次数: 0

摘要

本文报道了一种制备具有均匀和非均匀多孔结构的微模型的新方法,以获得对多孔介质流动的基本认识。采用微粒子图像测速技术(PIV)绘制了微模型内部的孔隙尺度速度场。使用由均匀分布的圆孔组成的薄穿孔金属板作为主图案,并使用类似于软光刻的方法将该穿孔板的负片副本转移到聚二甲基硅氧烷(PDMS)基板上。该方法通过调整和选择不同孔尺寸的穿孔片,可以有效地制造具有不同孔隙率的微模型。利用微piv技术进行了孔隙尺度速度分布的测量,验证了所制备微模型的适用性和可靠性。在不同晶粒排列方式的高孔隙率微观模型中,速度场表现出定性和定量的差异。测量了微模型两端的压降。压差随流量呈非线性变化,微柱形态对压差的影响显著。而在低孔隙度条件下,压差随流量的变化呈线性变化,微柱形态几乎不受影响。利用双孔隙度微模型进行了流动可视化测量,并通过速度矢量图分析了流动形态。
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A New Method to Develop Homogeneous and Heterogeneous Porous Micromodels Applicable to Enhanced Oil Recovery and Flow Visualization Experiments
In this paper, a new method to fabricate micromodels having homogeneous and heterogeneous porous structure is reported to gain the fundamental insight into the flow through porous media. The technique of micro particle image velocimetry (PIV) is used to map the pore scale velocity field inside the micromodels. A thin perforated metal sheet composed of uniformly distributed circular holes is used as the master pattern, and the replica of the negative of this perforated sheet is transferred to a Polydimethylsiloxane (PDMS) substrate using a method similar to the soft lithography. This method allows an efficient fabrication of micromodels having different porosity by adjusting and selecting the perforated sheets of different hole sizes. The prepared micromodels were tested for its applicability and reliability by carrying out the measurements of pore scale velocity distribution using the micro-PIV technique. The experiments with micromodels with high porosity but different grain arrangements showed qualitative as well as quantitative difference in the velocity field. The pressure drop across the two ends of micromodel is also measured. The varation of pressure difference with the flow rate is found to be non linear with significant effect of the patterns of micropillars. However, at low porosity the variation of pressure difference with the flow rate is found linear and there is almost no influence of the micropillar patterns. The flow visualization measurements are also conducted with the dual porosity micromodels and the flow patterns were examined by analyzing the velocity vector maps.
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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