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drag reducing
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  减阻
     Results by GPC indicated that,in a pilot plant the weight-average relative molecular mass of the solution polymers could reach over 5.0×106,and the drag reducing efficiency of the polymers was 55%~63%.
     GPC分析结果表明,中试装置溶液聚合物的重均相对分子质量可达到5.0×106以上,减阻率55%-63%,具有工业化价值。
短句来源
     The drag reducing efficiency is 40% by adding the polymer 0. 01 kg/m3 diesel oil.
     当减阻剂在柴油中的质量浓度为0.01kg/m3时,减阻率可达40.1%。
短句来源
     A 45% of the drag reducing efficiency can be achieved under the conditions of not coping with the polymer(adding mass concentration of 0.01 kg/m~3),which exceeds that of polymer by bulk polymerization(40.1% of DR).
     该聚合物未经脱溶剂处理,减阻率高达45%(添加质量浓度为0.01kg/m3),超过了本体聚合法得到的聚合物(减阻率为40.1%)。
短句来源
     bulk polymerization, temperature 0-30℃, normal pressure, 1.84:1(g/g), C7-C11 olefins, a drag reducing efficiency of 40.1% could be achieved by adding lOppm of polymer to diesel fuels.
     本体聚合法:温度0~30℃、常压、助/主1.84:1(g/g)、C_7~C_(11)烯烃,在0#柴油中添加10ppm,减阻率为40.1%。 已达到国内外同类产品先进水平。
短句来源
     Finai4y, the preferred condition of polymerization are obtained: polymerization in solvent, temperature 0-30℃, normal pressure, 0.79:1(g/g), C7-C11olefins, a drag reducing efficiency of 40.5% could be achieved by adding 10ppm of polymer to diesel fuels;
     溶液聚合法:温度0~30℃、常压、助/主0.79:1(g/g)、适合的单体为C_7~C_(11)烯烃。 在0#柴油中添加10ppm,减阻率为40.5%。
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  “drag reducing”译为未确定词的双语例句
     Study of Drag Reducing Agents in Multiphase Pipelines
     油气水多相管流中降阻剂机理研究
短句来源
     Phase Doppler Anemometry (PDA) was applied to measuring the turbulent characteristics of drag reducing fluid.
     应用激光相位多普勒测速仪测量了流体的速度场,对流体的湍流特征进行试验研究.
短句来源
     An Experiment on Cetyltrimethyl Ammonium Chloride Drag Reducing Fluid by Using PDA
     应用PDA对氯化十六烷基三甲基季铵盐溶液的实验研究
短句来源
     Experimental Study of the Characteristics of Turbulence in Drag Reducing Flow Using Surfactant Additives
     界面活性剂添加物对水湍流阻力抑制的实验研究
短句来源
     Experimental Research on the Turbulent Spatial Structure of a Drag Reducing Fluid with a Surfactant being Added
     表面活性剂减阻流体湍流空间结构试验研究
短句来源
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  相似匹配句对
     Progress in Drag Reducing Surfactant Research
     减阻表面活性剂的研究进展
短句来源
     Drag Reducing Polymer and Fluid Drag Reduction
     高分子聚合物和流体的减阻
短句来源
     heteroclita and of reducing K.
     polysperma和凤庆南五味子K .
短句来源
     contrarily reducing.
     反之减少。
短句来源
     for measuring drag coefficient.
     本文所模拟的过程基于Brucato等人所做的阻力系数测量实验的基础之上。
短句来源
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  drag reducing
In this research the flow of Newtonian and drag reducing fluids through a helical tube,i.e..
      
Suppression of experimental alimentary atherosclerosis with drag reducing polymers
      
The effect of adding carboxymethylcellulose drag reducing polymer on the rate of corrosion of aluminium tube through which sodium hydroxide solution flows, was studied by a weight loss technique.
      
Inhibition of diffusion controlled corrosion in pipelines by drag reducing polymers under turbulent flow conditions
      
Rates of mass transfer between a turbulently flowing fluid containing CMC drag reducing polymer and the wall of a tube were measured in the mass transfer entry region using the electrochemical technique.
      
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This paper introduces the results of high polymer drag reducing tests in brass tubes and fire hose with pump system, with emphasis on the effect of drag reduction in PW30 solutions made by Polyacrylamide (drag reductive effect of which above 70%), its solubility and the ability in resisting shearing force. It points out the evident effeet of PW-30 solution in cyclical systems and for long distance transfer through pipe line.

本文介绍了在黄铜管和消防帆布管中进行高分子减阻试验的结果,着重论述了用聚丙烯酰胺配制的PW—30的减阻效果、溶解性能和抗剪切性能,指出PW—30减阻剂在循环系统及长距离输送管线中具有显著减阻的可能性。同时介绍了高分子减阻技术在消防上的实际应用。

The cause of drag reduction by sediment in open channel flow is explained from the point of view that the clay flocs change the boundary condition of hydrodynamic stability in the viscous sub-layer. The similarities and differences between the drag reductions by polymers and clay-suspension are analyzed. It is pointed out that the mesh-nets formed by clay flocs have a more flexible character than that of polymers, therefore the drag reduction by clay-suspension is more effective than that of polymers. According...

The cause of drag reduction by sediment in open channel flow is explained from the point of view that the clay flocs change the boundary condition of hydrodynamic stability in the viscous sub-layer. The similarities and differences between the drag reductions by polymers and clay-suspension are analyzed. It is pointed out that the mesh-nets formed by clay flocs have a more flexible character than that of polymers, therefore the drag reduction by clay-suspension is more effective than that of polymers. According to the specific model of the drag reduction by sediment which conforms with Seyer-Metzner's model, formula (15) for calculating the drag coefficient r_s of open channel flow and formula (18) for calculating the increment factor of Chezy's coefficient r_o are derived. As clay is an inexhaustible, inexpensive and natural material with high efficiency in drag reduction, it may be expected that not only clay will be used as drag reducing additive instead of long-chain polymers in some fields, but also the method of drag reduction will be popularized in those fields where large amount of drag reducing material must be used.

本文从附壁区域的粘土絮团改变层流附面层动力稳定特性的角度解释了明流泥沙降阻的根源。文中分析了高分子稀液降阻与粘土泥沙降阻的异同点,指出粘土泥沙形成絮网具有微观力学上比高分子鏈网更为柔順,因而降阻效果更高的特点。根据泥沙降阻特有的图形,即它符合Seyer-Metzner图形,文中推出了明流降阻率r的計算式如式(15)和Chezy系数的增值率r_c的計算式如式(18)。考虑到粘土泥沙是天然材料,取之不尽,价廉,而在降阻上又具有高效的特点,故可預期,不仅泥沙将在一些領域取代长单鏈高分子作为降阻材料,并且,将使降阻在那些需应用大量降阻材料的领域推广。

Turbulent flows with drag reduction are of importance for many fields of science and technology. Owing to the complexity of this problem, former investigations on the time-averaged velocity distribution are restricted basically in empirical analyses, and the studies of velocity fluctuation are still on the stage of qualitative description of the experimental results. In this paper a relationship of shear (2,7) in viscoelastic fluids is derived from Maxwell's equation, and on this basis by using stochastic theory...

Turbulent flows with drag reduction are of importance for many fields of science and technology. Owing to the complexity of this problem, former investigations on the time-averaged velocity distribution are restricted basically in empirical analyses, and the studies of velocity fluctuation are still on the stage of qualitative description of the experimental results. In this paper a relationship of shear (2,7) in viscoelastic fluids is derived from Maxwell's equation, and on this basis by using stochastic theory of turbulent flow developed by the author, both time-averaged velocity distribution formula (3.5) and fluctuating velocity distribution formula (3.7) are deduced. In these formulas there is only one physical parameter D named as drag reduction parameter which can be determined by formula (4.6) upon the chemicophysical properties of drag reducing polymer additives. The formulas reported herein for vertical distribution of mean velocities and turbulent intensities can be applied to the viscous and buffer layers as well as to the turbulent core, The more recent experimental data of various investigators are used to verify the theoretical formulas of velocity distributions, and all the formulas obtained here are in very good agreement with the experiments. This article presents a theoretical basis for investigation on the mechanism of drag reduction and the friction factor, however the discussion on these subjects is not included here and will be discussed in other papers.

减阻紊流刘许多科学技术领域都具有重要意义。然而由于问题复杂,目前对其时均流速分布的研究,基本上局限于试验数据的经验分析,而对脉动流速的研究,还处于对试验资料的定性描述阶段。本文从粘弹性流体的基本方程式出发,导出了粘弹性流体的剪力关系式;并在此基础上应用作者提出的紊流随机理论,导出了光滑明渠和管道中减阻紊流的时均流速分布公式和脉动流速强度分布公式;最后根据聚合物的化学物理性质,给出了确定上述公式中减阻参数的公式。导出的时均流速分布公式和脉动流速分布公式,不仅适用于紊流核心区,而且也适用于近壁的粘性区和过渡区,从而使原来只有用三个公式才能近似表述的时均流速分布规律,有了一个统一公式,并使脉动流速问题得到了定量分析和概括。文中引用各家的减阻流试验数据对导得各公式进行了验证,得到了几乎完全一致的结果。本文为研究减阻机理和阻力等问题提供了理论基础,然而对这些问题的研究结果,将专文加以论述,不在此文之内。

 
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