The inner tube with hole and screw uses a larger thermal expansion coefficient material and outer tube with a smaller thermal expansion coefficient material and the outer tube is thin the inner tubes are thick .

带孔螺纹内管采用热膨胀系数较大的材料制成，外 管采用热膨胀 系数较小的材料制成，且外管较薄，内管较厚。

The experiment which water is the medium is a single-tube cold model . Observe the condition of uniform membrane around the wall of heat exchange tube and analyzing the variation of unwell-distributed coefficient under different spray density .

以水为介质进行了单管冷模实验，观察在不同的喷淋 密度下换热 管内壁的成膜情况，分析了在不同喷淋密度下成膜不均匀度的变化规律。

However enhanced tube can improve the heat transfer coefficient but it also causes the flow resistance increases which results in increase of energy consumption .

然而，强化 管在提高 管 内传热 系数的同时，也造成了流动阻力的增大，从而导致能耗增大。

Compared to conventional smooth tube reboiler the heat transfer coefficient enhanced by 30 % ~ 50 % . It is characterized by little occupation area low cost and steady operation .

T型翅片 管重沸器与普通光 管重沸器相比，其传热 系数可提高30%～50%，而且还具有占地面积小、投资省、操作平稳等优点。

The theoretical correction of pitot tube coefficient in longitudinally accelerated flow

VERIS公司均速 管流量计纵向加速流场中风速 管 系数的理论修正

On the one hand Frost reduced the flow area of air and fin surface On the other hand Frost affect the heat transfer performance of finned tube for its low coefficient of heat conductivity .

结霜一方面减少了空气与翅片表面的流通面积，另一方面由于霜的导热 系数很低，将影响翅片 管的传热效果。

Based on the principle of hydraulics the divergent tube is high in discharge coefficient and velocity coefficient at the inlet and high in vacuum at the contraction section so the efficiency of sludge discharge increases significantly .

该装置利用水力学中扩张 管嘴进口流量 系数大、流速系数高、收缩断面处真空度高的原理，使其排泥效率显著提高。

Under the rolling state of natural circulation Increasing the rolling cycle and increasing the rolling angle has the same effect which increase the severity of experimental tube swing causes friction coefficient of test section increase compared with the steady-state and flow flux decrease .

在摇摆自然循环状态下，增大周期和增大摇摆角度具有相同效果，都是加剧了实验 段摇摆的剧烈程度，导致实验段阻力 系数与稳态相比增大，流量减小。

For coated circular tube and circularly-grooved tube the good drop-wise condensation is achieved on the surface while 8 μ m coating circularly-grooved tube obtains maximum beat transfer coefficient under the vapor pressure a little higher than atomspheric pressure .

涂层圆管和涂层波槽管表面均得到了持续、良好的滴状冷凝，8μm涂层波槽 管在略高于大气压的蒸汽环境中获得了最大的传热 系数。

After analyzing the establishment of the discrete model this paper proposed a method applying BP neural networks to measure the key coefficient of the discrete model namely the static pressure change coefficient and the branch tube 's inlet and outlet resistance coefficient .

在对离散模型的建立进行详细分析的基础上，采用人工神经网络中的BP算法来确定离散模型中的关键系数，即集箱中的静压变化系数和 支管进出口的阻力 系数。

It is generally obtained by the experimental method namely using Newton cooling formula to get tube outside heat transfer coefficient then get the tube outside Nusselt number .

一般通过实验的方法求得，即运用牛顿冷却公式求出 管外对流换热 系数，进而求得管外努谢尔数。

Though the heat transfer ability in three kinds of spiral groove tube have improved obviously the resistance coefficient are also increased . So the heat transfer enchancement is at the cost of increasing the resistance .

三种螺旋槽 管的换热能力都得到了提高，但是其流动 阻力也增大了，说明螺旋槽管的强化换热是以增大阻力为代价。

The distributing rules of liquid floating in the tube and heat transfer are obtained by numerical simula - tion which shows that the slick tube has the highest integrated heat transfer coefficient when the twisted-tape insert is about 500 ~ 600 mm .

运用数值模拟得到管内流体流动和传热特性的分布规律。分析表明螺带后光管长度大约500～600mm时，此段光 管具有最大的综合传热 系数。

The total heat transfer power of pin-fin tube bundle is higher than smooth tube bundle but the heat transfer coefficient is smaller . The total heat transfer power and the heat transfer coefficient of porous tube bundle are higher than smooth tube bundle .

针翅管管束的总传热功率比光 管管束高，但沸腾传热 系数小于 光 管 管束，而多孔管管束的总传热功率和沸腾传热系数皆高于光管管束。

Presented and analysed in this paper is the surface temperature of a horizontally embedded tube in a high-temperature fluidized bed and the experimental result regarding the effect of power bed material on the embedded tube outer side heat transfer coefficient .

本文给出并分析了高温流化床中水平埋管的表面温度及粉末床料对埋 管外侧传热 系数影响的实验结果。

Based on the site-test datum the least square technique is used to identify the tube friction resistance coefficient μ and the tube deviation coefficients k. The rationality of the test method and the reliability of the ( identified ) results are illustrated .

根据实际测试结果采用最小二乘原理识别 管道摩阻 系数μ和偏差系数k，分析了测试方法的合理性和试验结果的可靠性。

Calculation and analysis of internal tube heat transfer coefficient of a fin and tube type air cooler heat exchanger

表面式空气冷却器 管内换热 系数的计算与分析

The Impact of Test Tube on The Reflection Coefficient of a Liquid Cylinder in Rectangular Waveguide

矩形波导中 试管对液体柱反射 系数的影响

Using mixed tube bundle high heat transfer coefficient can be acquired as well as pressure drop not too high .

采用混合 管束既可获得高的总传热 系数 和 管 内外传热 膜 系数，又可以使 管内压降不致过大。

Measurement Means of Flexible Tube Resistance Coefficient

软管 沿 程阻力 系数的测量方法

The radiant tube is characterized by higher radiation coefficient and higher heat radiation efficiency . And it helps to improve the thermal efficiency of the drying kiln .

这种辐射 管 黑度高，热辐射的效率也高，有利于提高干燥窑的热效率。

In this paper the stress equilibrium equation and the limit coefficient mathematics function of compound liquid bulge forming tube blank are deduced . The limit coefficient of compound bulging a 0 75 ton light freight-capacity truck axle housings is calculated .

本文推导出 管坯复合胀形应力平衡方程及极限成形系数的数学表达式，求解了075t轻型车后桥壳复合液压胀形极限成形 系数，确定了成形力参量的匹配关系。

It is found that under the same Reynolds number the fin tube heat exchangers have higher heat transfer coefficient especially at low Reynolds numbers .

在相同的Re情况下，纵向翅片 管换热器传热 系数K值明显高于 光 管换热器；

The average germ tube length and its variant coefficient had no relationship to virulence .

菌株毒力与萌芽 管平均长度及萌芽 管整齐 度（ CV）相关不显著。

For latest multifunction solar cooling tube the coefficient of performance ( COP ) was about 0.268 and the total efficiency of solar cooling and heating was about 87.7 % .

目前，实验结果表明，最新的多功能太阳能冷 管 COP可达0.268，太阳能制冷与供热的总效率可达87.7%。

The heat transfer coefficient of single finned tube and quality coefficient of single double metal finned tube can be tested in the test system .

所研制的全自动翅片 管单管传热性能试验系统可测试翅片管单管的传热系数、双金属翅片 管的品质 系数。

Heating power calculation made known that the porcelain enamel tube air preheater coefficient of heat transfer was smaller than the carbon steel 's and the heat transfer area was a little great ;

热力计算表明搪瓷 管空气预热器传热 系数略小于碳钢管预热器，传热面积略大；