porous surface tubes

Experiment on the pressure distribution characteristic of porous pipe

多孔管的压力分布特性试验

Through the analysis of friction and pressure recovery in porous pipe manifolds coefficients, the pressure recovery coefficient is represented as a function of flow velocity.

通过摩擦系数λ和动量交换系数ｋ两种变量的分析，确定了多孔管摩擦系数λ和动量交换系数ｋ的分析表达式，在此基础上，求出了变系数变质量动量方程的分析解。

The buried depth of porous pipe is one of the important technological parameter for subsurface drip irrigation(SDI).

本试验以 6kPa和 4 0kPa分别作为保护地渗灌的灌水上限和灌水下限 ,以土壤水分张力计读数控制灌水起始点 ,研究了不同的多孔管埋深 (分别为 2 0、30、4 0cm)对保护地土壤水分状况和温度状况等土壤环境条件以及番茄生长发育状况、产量、外观品质和水分利用率的影响。

The dimensionless formulae of pressure head curve was deduced by establishing fluid differential equation of perforated pipe and a theoretical method to calculate the catch uniformity of perforated pipe was given.

多孔管广泛用于给水排水设备的配水和集水系统中。

In this paper,thetype of flow in perforated pipe was analysed,and the influence of which on calculating waterhead losses was simulated by computer programme.

大量计算表明，灌溉中使用的小流量多孔管的首端流态一般是紊流光滑区和紊流过渡区，而在末端或多或少出现一定长度的层流段。

Aiming at the questions of high energy consumption after the technological modification for enlarging its production,three retrofit schemes are presented:Using a high-efficient lamella heat exchanger instead of the conventional shell and tube heat exchanger,using a high flux porous surface tube in the reboiler,and using a water heat medium preheater to recover three furnaces' surplus heat.

介绍了某厂芳烃歧化装置的工艺流程,针对该装置扩能改造后出现能耗较高的问题,提出了改造方案:采用高效板壳式换热器更换传统的管壳式换热器,再沸器内采用表面多孔管高通量换热管,同时将3台加热炉联合共用1套水热媒空气预热器进行系统改造,可有效地解决现行装置的用能瓶颈,节能效果显著。

In this paper, the heat transfer performance of the pin-fin tube, porous surface tube and smooth tube which are all made of B30 was first researched on the condition of convection.

本文以B30针翅管、多孔管和光滑管为研究对象，以水为冷却工质，对几种管型在对流工况下的换热特性进行实验研究；并根据实验结果，对比各种换热管的传热能力，以寻求实用的最佳换热管，优化换热器的性能。

In this paper,water was used as boiling medium,and the boiling heat transfer characteristics of smooth tube and three other kinds of enhanced tubes including integral pin-fin tube,porous surface tube and winded pin-fin tube were studied experimentally.

整体针翅管表面大量螺旋排列的三维翅片增大了换热面积、延缓了汽泡在壁面附近聚合形成大汽膜,使沸腾换热得到强化;多孔管采用机械方法在壁面加工出大量微细小孔,汽化核心数量和汽泡脱离频率均大幅提高,因此,沸腾换热强化效果显著;绕丝针翅管是一种复合强化手段,兼有整体针翅管和多孔管的优点,沸腾换热强化效果也较好。

Comparison of physical models of boiling heat transfer of porous surface tubes for heat exchangers;

换热器用多孔管沸腾传热物理模型比较

Study of scaling characteristics on sintered porous surface tubes with copper nickel alloy base in NaCl solution;

烧结型白铜多孔管在NaCl溶液中的结垢性能

Group B is treated by traditional method of gastric lavage with no change in insertion length, while group A is treated by porous stomach-tube with the insertion length of cannula being .

B组采用传统洗胃方法和插入长度 ;A组采用多孔胃管并延长插入长度 1 0～ 1 5cm。

perforated pipe sprinkler

多孔管喷水灭火装置

Experimental Investigation on Nucleate Pool Boiling Heat Transfer for Mechanically Fabricated Porous Surface Tube;

机加工表面多孔管池核沸腾试验研究

Effect of the Positions of Thermocouples on the Wall Temperature Measurement;

测点分布对多孔管道加热面温度测量的影响

Heat Transfer and Fouling Characteristics of Sintered Porous Surface Tubes in NaCl Solution

烧结型多孔管在NaCl溶液中的传热与结垢特性

aperture mask tricolor kinescope

多孔障板式三色显像管

Study of Macroporous Ceramic Pipes Prepared in Cold Isostatic Pressing

冷等静压法制备大孔径多孔陶瓷管研究

conduct, of porous common pottery (excl. insulating electric conduit tubing)

普通陶质多孔导管（不包括电绝缘导管管材）

guttering of porous common pottery

普通多孔陶质料制的雨槽管

The Study on Water Application Rate Distribution of Punched Micro-Irrigation Tubing;

多孔式PVC微喷灌管喷水特性实验研究

Study on pressure drop characteristics of multi-downcomer sieve tray

多降液管筛孔塔板的压力降性能研究

Multi-Porous in the application of detecting a special pipeline

多孔验证法在特殊管线探测中的应用

not porous; especially not having vessels that appear as pores.

不是多孔的；特别是没有看起来像孔一样的管状结构。

Preparation of Co_3O_4 Nanotubes and Pore Structure of Porous Alumina Template

氧化钴纳米管的制备和模板剂多孔氧化铝的孔洞结构

Management System of Geological Prospecting Bore Rock Core Information Multimedia Database

地质勘查钻孔岩芯信息多媒体数据库管理系统

Study on the Growth of Aligned Carbon Nanotubes on a Porous Support;

碳纳米管在多孔基体上的取向生长研究

Preliminary Research on Angiogenesis Modes in Porous Silk Fibroin Materials

多孔丝素蛋白材料中血管新生模式的研究

Experimental Study for the Effect of Vascularize in High-density Porous Polyethylene

VEGF对多孔高密度聚乙烯血管化的实验研究

Study on Heat Transfer Enhancement by Filling Tube Inner Part with Two Layers of Porous Media

管中心填充两层多孔介质强化传热研究