共查询到20条相似文献,搜索用时 156 毫秒
1.
2.
应用单相流量计测量油水两相流 总被引:2,自引:0,他引:2
为探讨单相流量计用于液液两相流参数测量的可行性和有效性,本文对文丘里管、涡轮流量计和椭圆齿轮流量计用于油水两相流测量的响应特性进行了实验研究.文丘里管和涡轮流量计的实验管径为15 mm,25 mm,40 mm,椭圆齿轮流量计的实验管径为25 mm和40 mm.油水两相流总体积流量范围为1~5 m3/h,油含率范围为15%~85%.实验结果表明,文丘里管在高油含率时测得的油水两相流流量比实际流量偏大4%~5%.涡轮流量计的测量误差随油含率升高呈现增大的趋势,最大测量洪差小于5%.椭圆齿轮流量计用于油水两相流测量时相对测量误差小于1.0%且基本不受油含率影响. 相似文献
3.
本文研究了运用单相流量计组合进行液液两相流参数测量的方法.该方法首先通过静态混合器将液液两相流混合成为均相流,然后利用文丘里管获得两相流差压,利用涡轮流量计获得两相流总体积流量,最后通过液液两相流测量模型获得液液两相流总体积流量、总质量流量、混合密度以及分相流量.初步实验结果表明该方法是可行的,在总体积流量1~6 m3/h,油含率15%~85%的范围内,可有效地测量液液两相流的总体积流量、总质量流量和两相流混合密度,测量相对误差在5%以内,但液液两相流分相流量测量相对误差较大,仍需进一步研究. 相似文献
4.
油水两相流含水率测量组合传感器 总被引:1,自引:0,他引:1
《工程热物理学报》2015,(7)
针对水平管油水两相流中水相导电时,实现含水率0~100%范围测量问题,提出一种用于油水两相流含水率测量的电导和电容组合传感器。根据两相流中连续相的不同,选择不同传感器测量数据实现含水率的测量。通过对油水两相流实验测试数据的分析,得到电导和电容传感器在全含率范围测量时的响应特性,并实现传感器间数据选择。实验结果表明,含水率25%是传感器切换关键区域。将电导和电容传感器测试数据与含率测量模型结合,可实现含水率的全范围测量,测量结果具有较高的精度和良好的线性度。 相似文献
5.
6.
7.
8.
9.
10.
11.
Weradeach Sangkhun Laksana Laokiat Visanu Tanboonchuy Pummarin Khamdahsag Nurak Grisdanurak 《Superlattices and Microstructures》2012
W-doped TiO2 were immobilized on fiberglass cloth (FGC). The catalyst possessed small crystallite sizes with a red-shift on an absorption edge. Good dispersion was observed over the immobilized catalyst. The photocatalytic degradation of gaseous BTEX was conducted in a flow reactor under day-light fluorescent. Parameters including gas flowrate, catalyst loading, initial concentration and relative humidity (%RH) were investigated. The prepared catalysts showed higher efficiency than that of TiO2 approximately 18, 3, 3 and 2.5× for benzene, toluene, ethylbenzene and o-xylene, respectively. The condition to achieve 100% BTEX removal was found at 20 min/ml, catalyst loading 0.1 mg/cm2 and 30% RH. 相似文献
12.
The influence of punching on the magnetic properties of fully annealed electrical steel sheet with 1 % Silicon has been investigated. By comparing to an Epstein sample, which had its deformed edges carefully removed, it was found that the total power loss increases and the permeability decreases with increasing the specific cut edge. At a length of 100 m/kg the increase P 1.0 is about 30% when samples were cut with a sharp tool and even 40% for a blunt tool. The greatest change of the induction occurs in the range of maximum permeability. At 100 m/kg cut edge the decrease is about 70%: an influence of the clearance on the magnetic properties could not be shown clearly; the area of edge hardening was 0.35 mm in width; there was no influence of tool wear.Original magnetic properties have been obtained after box annealing at 700°C/1 h in dry nitrogen. 相似文献
13.
A new characteristic approach that guarantees conservative property is proposed and is applied to the shallow water equations. CIP–CSL (Constrained Interpolation Profile/Conservative Semi-Lagrangian) interpolation is applied to the CIP method of characteristics in order to enhance the mass conservation of the numerical result. Although the characteristic formulation is originally derived from non-conservative form, present scheme achieves complete mass conservation by solving mass conservation simultaneously and reflecting conserving mass in interpolation profile. Present method has less height error compared to the CIP method of characteristics by several orders of magnitude. By the enhanced conservation property, present scheme is applicable to nonlinear problem such as shock. Furthermore, application to two dimensions including the Coriolis term is straightforward with directional splitting technique. 相似文献
14.
Richard J. Wiener Philip W. Hammer Charles E. Swanson David C. Samuels Russell J. Donnelly 《Journal of statistical physics》1991,64(5-6):913-926
Taylor-Couette flow subject to a Coriolis force is studied experimentally and numerically. In the experiment, the Couette apparatus is mounted on a turntable with the axis of the cylinders orthogonal to the rotation vector of the turntable. The Coriolis force stabilizes the fluid against the onset of Taylor vortices and alters the velocity fields, both above and below the transition from the initial flow. At small dimensionless turntable frequencies, the transition yields time-independent Taylor vortices which are tilted with respect to the cylinder axis. At larger there is a direct transition to turbulence. We determine the first-order correction to the classical Couette initial flow, to account for the effects of the Coriolis force, by expanding in powers of. We present numerical results for the axial velocity (the only nonvanishing correction term to order) in the infinite-cylinder approximation. 相似文献
15.
J.Y. Zhang W.J. XuJ. Carlier X.M. Ji B. NongaillardS. Queste Y.P. Huang 《Ultrasonics》2012,52(1):47-53
Background
High-frequency ultrasonic transducer arrays are essential for high resolution imaging in clinical analysis and Non-Destructive Evaluation (NDE). However, the fabrication of conventional backing-layer structure, which requires a pitch (distance between the centers of two adjacent elements) of half wavelength in medium, is really a great challenge.Objective and method
Here we present an alternative buffer-layer structure with a silicon lens for volumetric imaging. The requirement for the size of the pitch is less critical for this structure, making it possible to fabricate high-frequency (100 MHz) ultrasonic linear array transducers. Using silicon substrate also makes it possible to integrate the arrays with IC (Integrated Circuit). To compare with the conventional backing-layer structure, a finite element tool, COMSOL, is employed to investigate the performances of acoustic beam focusing, the influence of pitch size for the buffer-layer configuration, and to calculate the electrical properties of the arrays, including crosstalk effect and electrical impedance.Results
For a 100 MHz 10-element array of buffer-layer structure, the ultrasound beam in azimuth plane in water could be electronically focused to obtain a spatial resolution (a half-amplitude width) of 86 μm at the focal depth. When decreasing from half wavelength in silicon (42 μm) to half wavelength in water (7.5 μm), the pitch sizes weakly affect the focal resolution. The lateral spatial resolution is increased by 4.65% when the pitch size decreases from 42 μm to 7.5 μm. The crosstalk between adjacent elements at the central frequency is, respectively, −95 dB, −39.4 dB, and −60.5 dB for the 10-element buffer, 49-element buffer and 49-element backing arrays. Additionally, the electrical impedance magnitudes for each structure are, respectively, 4 kΩ, 26.4 kΩ, and 24.2 kΩ, which is consistent with calculation results using Krimholtz, Leedom, and Matthaei (KLM) model.Conclusion
These results show that the buffer-layer configuration is a promising alternative for the fabrication of high-frequency ultrasonic linear arrays dedicated to volumetric imaging. 相似文献16.
本文首先简要介绍了我们自主开发的智能型多相流量计的基本原理,包括气相流量和液相流量计量,以及液相含水率的计量。继而,对工业样机的现场试验条件以及试验结果进行了详细的论述。数据表明:该多相流量计工业样机的液相流量计量相对误差在±8%以内,其中95%以上位于±5%范围内;气相流量计量相对误差在±20%以内,其中67%在±5%以内,88%在±10%以内,98%在±15%范围内;液相含水率绝对误差在±2%以内。该工业样机计量精度可以满足油田生产的需要。 相似文献
17.
New measurements of the ozone spectrum in the microwave and 10-μm infrared regions have been made. These new lines have been fit to a three-state Hamiltonian model which includes Coriolis interactions beteen (0, 0, 1) and (1, 0, 0). The model requires additional Coriolis parameters, as well as an appreciation for the parameters which are indeterminate. Transition dipole moments have been derived from the intensities of selected infrared lines. 相似文献
18.
The present study evaluates the tool life and the fracture toughness of AISI M2 steel cutting tools boronized by the paste boriding process. The treatment was done in selective form on the tool tips of the steels. The temperatures were set at 1173 and 1273 K with 4 h of exposure time and modifying the boron carbide paste thicknesses in 3 and 4 mm. Microindentation fracture toughness method was used on the borided tool at the temperature of 1273 K and a 4 mm paste thickness, with a 100 g load at different distances from the surface. Also, the borided cutting tools were worn by the turning process that implied the machining of AISI 1018 steel increasing the nominal cutting speed, of 55 m/min, in 10 and 25% and maintaining the feed and the depth cut constants. The tool life was evaluated by the Taylor's equation that shows the dependence of the experimental parameters of the boriding process. 相似文献
19.
将快速傅里叶变换(FFT)与线性调频Z变换(CZT)联合变换的方法应用到法布里-珀罗(F-P)腔传感器的解调中,从理论上分析了该方法的解调原理及误差.模拟计算得出,该联合算法解调出的腔长的相对误差达到0.01%,腔长的最大绝对误差小于0.05 μm.在对测量范围为O~3 MPa的F-P腔微机电系统(MEMS)压力传感器进行的解调试验中,该算法可以辨别0.01 MPa的压力,腔长与压力数据的拟合度为0.99316,测量压力与实际压力的标准偏差小于0.005 MPa.实验结果表明,FFT与CZT联合解调的方法可以在较少计算量的基础上达到较高的精度,满足实际需求. 相似文献
20.
Measurements of coating density using ultrasonic reflection coefficient phase spectrum 总被引:1,自引:0,他引:1
A nondestructive method to determine the density of coating has been proposed in this paper based on the ultrasonic reflection coefficient phase spectrum (URCPS). A model was set up first to represent the ultrasonic waves reflected from a coating system at normal incident, and the relation between the extremum of URCPS and the coating density was established to provide the principle of determining the density. The ultrasonic method was validated on a series of ZrO2-7 wt.%Y2O3 (YSZ) coatings with various density. The specimens were prepared by electric beam physical vapor deposit (EB-PVD). After deposition, the specimens were irradiated using high-intensity pulsed ion beam (HIPIB) at different ion current density of 100 and 200 A/cm2 to change coating density. The coating densities of as-deposited and post irradiation by HIPIB were derived to be 4940-5030, 5200-5320 and 5390-5470 kg/m3, respectively. The relative error between the coating density measured by the ultrasonic method and Archimedean principle ranging from 2.53% to 6.11%, indicates that the proposed ultrasonic quantification method provides a reliable nondestructive way to determine coating density. 相似文献