共查询到19条相似文献,搜索用时 93 毫秒
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文丘里管内气固两相流动的数值模拟和实验 总被引:1,自引:1,他引:1
文丘里流量计以价格低廉、结构简单、运行稳定和安装方便在单相流体测量中得到了广泛的应用.通过多年的实验研究和理论分析,文丘里管被认为是传统的差压流量计中最适合用于气固两相流流量测量的仪表.利用双流体模型对文丘里管内的气固两相流动进行了数值模拟,分析了气相和固相物质间的相互作用和流动形式,仿真结果验证了模型的准确性. 相似文献
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为进一步揭示轴流泵的气液两相流动的一般规律,基于ANSYS软件对轴流泵的气液两相流动三维流场进行数值计算与分析,研究了叶轮及出口导叶的压力面和吸力面的静压分布及气泡体积分布情况。结果表明,叶轮流道内,同等气泡体积分数下,当气泡粒径增大时,压力面上的气泡会由叶片出口处向着靠近轮毂处减少;而吸力面上的气泡会由进、出口处向着叶片中部靠近轮毂处聚集。气泡粒径不变时,当气泡体积分数增大时,叶片压力面上的气泡会由进口及轮缘处向着出口靠近轮毂处聚集;而吸力面上的气泡会由进、出口处向着叶片中部靠近轮毂处聚集。导叶流道内,同等气泡体积分数下,当气泡粒径增大时,叶片压力面上的气泡会由出口及轮缘处向着进口靠近轮毂处聚集,出口靠近轮缘处气泡越来越少;而吸力面上的气泡会由叶片进、出口向着叶片中部慢慢扩散。气泡粒径不变时,当气泡体积分数增大时,压力面上的气泡会由进口靠近轮毂处向着出口靠近轮缘处扩散;而吸力面上的气泡会由叶片进、出口向着叶片中部扩散。 相似文献
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为研究投产时入口流体温度、环境温度对气液两相流管道输送的影响,采用OLGA多相流数值模拟软件,建立外输管道传热模型,得到投产初期不同输送温度下管道末端段塞流捕集器的油气处理量;分析了季节因素导致的地温差异对气液两相流管道输送的影响;得到由于温度差异导致的管道内压力、总积液量、气液两相体积流量的变化。在相同输送条件下流体温度越低管道末端分离出的液相体积流量越大,管道内的总积液量也越大;相反,随着流体温度的升高,管道末端分离出的液量逐渐减少,管道内的总积液量也减少。 相似文献
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使用多普勒激光测速仪测量了水平直管道中气体-颗粒两相流动的流场.实验中,采用三维粒子动态分析仪(Particle Dynamics Analyzer)测量了粒径在0~100 μm玻璃微珠的时均速度和脉动速度分布,颗粒相的体积分数在10-4~10-5之间.实验结果表明,即使在粒径范围为100 μm以下的颗粒,其在气相流场中的存在仍然会引起湍流流场结构的改变.实验还观察到气体-颗粒两相流动的湍流强度会随粒径的减小而增加,而且其脉动速度的分布将会在壁面附近出现脉动和随机分布的特征. 相似文献
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循环流化床脱硫装置的文丘里管直流流化速度随锅炉负荷的变化而变化,这会影响脱硫效率。本文提出了适应锅炉负荷变化的直/旋流复合流化方式,并用PDA测量系统对这种流化方式的气固两相流场进行测试,得到了循环流化床内旋流风率和假想切圆半径改变时气固切向速度和浓度分布。试验表明,复合流化循环流化床的切向速度随着半径增大而升高,气固切向滑移速度比直流流化增大,脱硫塔内的浓度增加,内循环增强,脱硫效率随之提高。 相似文献
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In this paper, an experimental investigation on the flow boiling heat transfer in a horizontal long mini-channel was carried out. The mini-channel was with 2 mm wide and 1 mm deep and 900 mm long. The material of the mini-channel was stainless. The working fluid was deionized water. The experiments were conducted with the conditions of inlet pressure in the range of 0.2~0.5 MPa, mass flux in the range of 196.57-548.96 kg/m2s, and the outlet vapor quality in the range of 0.2 to 1. The heat flux was in the range of 292.86 kW/m2 to 788.48 kW/m2, respectively. The influences of mass flux and heat flux were studied. At a certain mass flow rate, the local heat transfer coefficient increased with the increase of the heat flux. If dry-out occurred in the mini-channel, the heat transfer coefficient decreased. At the same heat flux, the local heat transfer coefficient would depend on the mass flux. It would increase with the mass flux in a certain range, and then decrease if the mass flux was beyond this range. Experimental data were compared with the results of previous studies. Flow visualization and measurements were conducted to identify flow regime transitions. Results showed that there were eight different kinds of flow patterns occurring during the flow boiling. It was found that flow pattern had a significant effect on heat transfer. 相似文献
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Michał Łukaszuk 《传热工程》2013,34(4):331-334
This article describes experimental investigations of two-phase flow regimes for steam–water flowing in horizontal ducts of small diameters. In this respect two-phase flow patterns are determined on a test stand based on visualization of real flows. Measurements were performed for a round tube with an internal diameter of 2.8 mm under mass flux ranging from 160 kg/s-m2 to 1600 kg/s-m2 at saturation temperatures between 373 K and 403 K. Registered steam quality varied from 0.02 to 0.27. Experimental setup, methodology, and recorded two-phase flow patterns referenced to annular, intermittent, and transient flows are presented. The results obtained have been compared with annular to wavy transition criteria described on the flow map by Soliman. 相似文献
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