1) lower critical velocity
低临界流速
2) critical flow rate
临界流速
1.
The result indicates that critical flow rate at the beginning of sand production declines with the rising of oil viscosity and pH value of fluid; when pH value exceeds 12, sand production increases remarkably.
研究结果表明,开始出砂的临界流速随原油粘度以及流体pH值的升高而下降;当pH值超过12以后,出砂量显著增大。
2.
The results indicate that critical salt concentration and critical flow rate exit on the saltwater-freshwater interface.
试验结果表明,咸淡水界面上存在临界盐浓度值和临界流速值,当入流溶液浓度达到临界盐浓度和流速达到临界流速时,都会产生颗粒释放现象,导致砂柱的渗透率下降,水敏性发生。
3.
The critical flow rate,VT could be estimated from the statistic curves.
从统计曲线上估算了临界流速的大小,当流速超过上述临界值时,管线服役寿命不会超过2年;临界流速从2004年时的4。
3) critical velocity
临界流速
1.
The relation of aeration rate with wastewater flow,designed bioreactor height,and flowing section area of main and sub chamber was analyzed theoretically,as well as the relation of the critical velocity of membrane fouling outside with the internal suction pressure and the width of main chamber.
从理论上分析了一体式膜生物反应器内曝气量与污水流量、反应器设计高度、主副腔过流面积的关系,膜外污染错流临界流速与抽吸压力及主腔宽度的关系,膜管内污染的临界速度与膜管径、膜壁吸力的关系,并得出采用化学方法消除膜污染的原理。
2.
From the theoretical analysis,it can be seen that the relationship between the critical velocity of membrane outer surface and suction pressure, the width of cross-flow section and the aeration,the relationship between the critical velocity of membrane inner surface with or without gel layer and membrane pipe diameter,particle size,suction pressure,flow condition and at.
运用气、液、固三相流运动力学原理对一体式膜生物反应器运行过程分析,得出:①反应器膜外污染的临界流速与膜管抽吸压力及主腔宽度、曝气条件的关系;②膜管内膜壁存在或不存在凝胶层条件下,产生污染的临界速度与膜管径、污染物粒径、膜管内抽吸压力、膜管内流态及膜壁对污染物吸附力的关系;③消除膜污染运行控制措施及条件。
3.
In view of the fact that raw coal in question is wide in size range, an equation for calculating the friction loss and critical velocity of this kind of coal slurry has been proposed by using dimensional and regression analysis methods based on over 5000 groups of data actually observed at five typical hydro mines.
考虑到原煤粒度分布较宽的特点，在５个典型水采矿井的５０００多组实测数据基础上，通过因次分析和回归方法，得出宽粒度分布煤浆管道输送参数摩擦阻力损失和临界流速的计算公式。
4) critical velocity of flow
临界流速
1.
Influence of draft change of floating bridge with vehicles on tension of anchor-cable and critical velocity of flow;
浮桥通载时吃水变化对锚纲张力和浮桥临界流速的影响
2.
If there is a critical velocity of flow which make the algae growth rapidly in Three Gorges Reservoir and tributaries and how to certain it are the urgent problems which should be solved.
库区内的优势藻类爆发生长是否存在临界流速,以及临界流速怎样测定,已经成为一个亟待解决的问题。
5) critical flow velocity
临界流速
1.
Effect Factors and Calculating Analysis of Critical Flow Velocity in Slurry Pipeline Transportation;
浆体管道输送临界流速的影响因素及计算分析
2.
Based on the sedimentation theory and combined with the experimental analysis, the critical flow velocity of paste-like slurry in pipeline transportation is put forward.
根据固体物料的沉降理论,结合实验分析,提出了似膏体料浆在管路中的临界流速值;分析了浆体浓度及管道直径对似膏体料浆管输临界流速的影响规律。
3.
The critical flow velocity of reservoir, sand produ.
具体储层的临界流速,油井出砂率,挡砂层的挡砂率是该技术的成功核心。
补充资料：尾矿输送临界流速
尾矿输送临界流速
critical velocity of the flow of tailings slurry
welkuang shusong}inJ!e}一usu尾矿输送临界流速(critieal veloeity of theflow of tailings slurry)尾矿浆体由一种流动形态向另一种流动形态过渡的界限流速。临界流速对于尾矿水力输送中输送流速的确定有重要的作用。输送流速低于临界流速，易导致尾矿颗粒淤积甚至堵塞管、槽;过高于临界流速，则输送动力消耗大，管、槽壁的磨损加剧。 尾矿浆体多属沉降性浆体。它在水平管、槽中流动时，随着流速的由高到低的变化，阶段性地呈现出伪均质流、悬浮非均质流、有滑动层的非均质流和有沉积层的非均质流四种形态。当浆体流速较高时，尾矿颗粒在断面上的分布基本均匀，呈现伪均质流形态。当浆体流速减低时，尾矿颗粒在断面上的分布开始不均匀，有明显的浓度梯度，呈现悬浮非均质流形态。当浆体流速进 1步减低时，部分较粗或较重的尾矿颗粒沉积到管、槽底部，并以滑动、滚动和跳跃的方式向前移动，呈现有滑动层的非均质流形态。而当浆体流速降低到一定程度，尾矿颗粒在管、槽底部形成时冲时淤的活动底床或稳定的固定底床，此时即呈现有沉积层的非均质流形态。般低浓度的尾矿浆体，其临界流速也可相应地分为均质的、悬浮的和淤积的三种。 均质临界流速为伪均质流与悬浮非均质流的界限流速。悬浮临界流速为悬浮非均质流与有滑动层非均质流的界限流速。淤积临界流速则为有滑动层非均质流与有沉积层非均质流的界限流速。在淤积临界流速下输送浆体，其水力坡度(见尾矿输送水力坡度)近于最小。 不同阶段的临界流速概念有助于揭示固液两相流的运动规律。但淤积临界流速的概念更具实用性，因此实际工作中把它简称为临界流速。临界流速的计算方法很多，常用的有杜兰德(R.Durand)、瓦斯普(E.J.wasp)、尤芬(八.r工.。巾。H)、克诺劳兹(B.c.K，，opo。)和柯别尔尼克(C .1’.Ko6叩阴K)等人的公式。但这些公式的使用都有其局限性和近似性。对于重要的工程，如长距离的大、中型的尾矿水力输送系统，必要时应通过试验确定临界流速，以确保可靠性和降低能耗。中国选矿厂的尾矿水力输送临界流速多采用克诺劳兹公式计算，其公式为: (z)当口‘镇0 .o7mm时 VI~o·2夕(1+3 .43c昌“SDF‘875) (2)当0 .07匕己p簇0.15mm时 V，一O·255月(1+2.4sC吕“33刀尸25)式中d。为尾矿加权平均粒径，mm;Vl为矿浆临界流速，m/s;D，为临界管径，m; Cd为矿浆质量稠度又100;召为尾矿密度修正系数，按下式计算:月一(几一l)/x.7;z‘为尾矿密度，g/em3。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条