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两相层流的复阻抗频散模型研究
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作者 程林峰 柯式镇 +3 位作者 石洪玮 张宇航 罗虎 陶婕 《测井技术》 CAS 2023年第6期679-686,共8页
在油气生产中含水率是进行产能评估和调整开发策略的重要指标,需要寻找一种更为经济有效的含水率检测方法。复阻抗频谱(CIS)检测技术是一种低成本、易实现、环保安全的快速检测方法,具有较大的开发潜力。基于复阻抗频散机理,结合Randle... 在油气生产中含水率是进行产能评估和调整开发策略的重要指标,需要寻找一种更为经济有效的含水率检测方法。复阻抗频谱(CIS)检测技术是一种低成本、易实现、环保安全的快速检测方法,具有较大的开发潜力。基于复阻抗频散机理,结合Randles电路和Cole-Cole模型优势提出了一种适用于两相层流的复阻抗频散模型。研究制作了一套两相层流检测装置,并基于频谱分析和粒子群优化算法(PSO)反演获取模型参数,包括等效溶液阻抗、弛豫时间常数、频率相关指数、扩散阻抗系数以及弥散系数,并通过对照实验讨论了含水率和矿化度对模型参数的影响。实验结果表明,新模型计算值与实测值具有较好的一致性,同时模型参数与含水率、矿化度满足幂函数关系,可用于定量评价。该方法在传统测井采用的单频阻抗检测技术基础上修正了地层水矿化度影响,这对生产测井中的产能评估有重要意义。 展开更多
关键词 两相层流 复阻抗频散模型 频谱分析 矿化度 含水率
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斜板重力分离器的研究 被引量:4
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作者 常勇 吴剑华 杨芙 《沈阳化工学院学报》 2005年第3期204-208,共5页
简要叙述斜板分离器斜板处层膜上的单个液滴的基本聚结原理.以Navier-Stokes方程为基础,通过对实际情况的分析与简化导出液-液两相层流流动速度分布的数学模型及液层厚度的计算公式.为进一步研究液-液分离过程提供了基础.介绍了斜板重... 简要叙述斜板分离器斜板处层膜上的单个液滴的基本聚结原理.以Navier-Stokes方程为基础,通过对实际情况的分析与简化导出液-液两相层流流动速度分布的数学模型及液层厚度的计算公式.为进一步研究液-液分离过程提供了基础.介绍了斜板重力分离器的设计方法. 展开更多
关键词 液滴聚结 两相层流 层膜
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An ECT System Based on Improved RBF Network and Adaptive Wavelet Image Enhancement for Solid/Gas Two-phase Flow 被引量:3
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作者 陈夏 胡红利 +1 位作者 张娟 周屈兰 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第2期359-367,共9页
Electrical capacitance tomography(ECT) is a non-invasive imaging technique that aims at visualizing the cross-sectional permittivity distribution and phase distribution of solid/gas two-phase flow based on the measure... Electrical capacitance tomography(ECT) is a non-invasive imaging technique that aims at visualizing the cross-sectional permittivity distribution and phase distribution of solid/gas two-phase flow based on the measured capacitance.To solve the nonlinear and ill-posed inverse problem:image reconstruction of ECT system,this paper proposed a new image reconstruction method based on improved radial basis function(RBF) neural network combined with adaptive wavelet image enhancement.Firstly,an improved RBF network was applied to establish the mapping model between the reconstruction image pixels and the capacitance values measured.Then,for better image quality,adaptive wavelet image enhancement technique was emphatically analyzed and studied,which belongs to a space-frequency analysis method and is suitable for image feature-enhanced.Through multi-level wavelet decomposition,edge points of the image produced from RBF network can be determined based on the neighborhood property of each sub-band;noise distribution in the space-frequency domain can be estimated based on statistical characteristics;after that a self-adaptive edge enhancement gain can be constructed.Finally,the image is reconstructed with adjusting wavelet coefficients.In this paper,a 12-electrode ECT system and a pneumatic conveying platform were built up to verify this image reconstruction algorithm.Experimental results demonstrated that adaptive wavelet image enhancement technique effectively implemented edge detection and image enhancement,and the improved RBF network and adaptive wavelet image enhancement hybrid algorithm greatly improved the quality of reconstructed image of solid/gas two-phase flow [pulverized coal(PC)/air]. 展开更多
关键词 electrical capacitance tomography.image reconstruction radial basis function network wavelet imageenhance ment
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Cauchy-Poisson Problem for a Two-layer Fluid with an Inertial Surface
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作者 Harpreet Dhillon B. N. Mandal 《Journal of Marine Science and Application》 2013年第1期21-30,共10页
This paper is concerned with the generation of waves due to initial disturbances at the upper surface of a two-layer fluid, as the upper layer is covered by an inertial surface and the lower layer extends infinitely d... This paper is concerned with the generation of waves due to initial disturbances at the upper surface of a two-layer fluid, as the upper layer is covered by an inertial surface and the lower layer extends infinitely downwards. The inertial surface is composed of thin but uniform distribution of non-interacting material. In the mathematical analysis, the Fourier and Laplace transform techniques have been utilized to obtain the depressions of the inertial surface and the interface in the form of infinite integrals. For initial disturbances concentrated at a point, the inertial surface depression and the interface depression are evaluated asymptotically for large time and distance by using the method of stationary phase. They are also depicted graphically for two types of initial disturbances and appropriate conclusions are made. 展开更多
关键词 two-layer fluid inertial surface initial disturbances stationary phase inertial surface depression interface depression
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Slurry erosion behaviors of P110 steel and chromizing coating in liquid-solid two-phase flow 被引量:2
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作者 LIN NaiMing XIE FaQin +1 位作者 ZOU JiaoJuan TANG Bin 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第6期1415-1423,共9页
A chromizing coating was formed on P110 oil casing tube steel (P110 steel) via pack cementation to improve its performance and increase the lifetime during operation. The slurry erosion behaviors of the P110 steel sub... A chromizing coating was formed on P110 oil casing tube steel (P110 steel) via pack cementation to improve its performance and increase the lifetime during operation. The slurry erosion behaviors of the P110 steel substrate and the chromizing coating were assessed in a liquid-solid two-phase flow condition. The results showed that the obtained coating exhibited higher surface hardness, lower mass loss, and lower slurry erosion rate than those of P110 steel. The chromizing treatment has significantly improved the surface hardness and slurry erosion resistance of P110 steel. 展开更多
关键词 slurry erosion oil casing tube P110 steel chromizing COATING
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