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natural heat transfer
相关语句
  自然对流换热
     Prediction on Natural Heat Transfer from an Array ofLine Heat Sources
     单列线热源自然对流换热预测
短句来源
  “natural heat transfer”译为未确定词的双语例句
     Measurements on temperature and natural heat transfer from an array of line heat sources
     大空间细长管排/单列线状热源温度与换热系数测定
短句来源
     The calculation is taken oil tank truck as an example, the calculation methods are valuable to some liquid vessel with insulated layer, and large space in which natural heat transfer,and forced heat transfer occure.
     虽然计算是以油罐车为特例,但就计算方法而言,对一些具有保温层的大气空间自然放热特征和强制对流放热特征的液体容器,也有一定的参考价值。
短句来源
     Natural heat transfer and flow patterns in a cylindrical annulus filled with saturated porous medium were numerically studied. The inner wall of the annulus is heated locally at constant temperature and the outer wall is isothermally cooled in order to simulate the electronic element heat process.
     对内壁面局部恒温加热,外壁面恒温冷却,其它壁面保持绝热条件下的竖直同心套管内多孔介质中的自然对流进行了数值研究,分析了瑞利数Ra、半径比κ及高宽比A对流场和温度场、内外壁面局部努塞尔数和加热段的平均努塞尔数的影响。
短句来源
     With the growing of frost layer in the initial growth period, the frost surface temperature is gradually increasing, and the frost growth rate, the effective thermal conductivity and the natural heat transfer coefficient are decreasing.
     随着霜层的形成和成长,霜层表面温度逐渐升高,霜层厚度增加速率减缓,有效导热系数迅速降低,自然对流传热系数也减小.
短句来源
  相似匹配句对
     Natural.
     Natural(天然等同)相近。
短句来源
     Application of Natural Gas in Heat Treatment
     天然气在热处理上的开发应用
短句来源
     NATURAL LIGHT AND HEAT CONTRIBUTION TO PLANTS
     自然光温贡献
短句来源
     The Natural Convection Heat Transfer of Small Objects
     小尺寸物体自然对流换热
短句来源
     Optical Interferometry In Natural Convection Heat Transfer
     自然对流传热的光干涉测量术
短句来源
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  natural heat transfer
Passive space heating uses natural heat transfer processes to collect, store, and distribute heat.
      
For instance, radiant is a large portion of the natural heat transfer of the Mono lithic Dome.
      


The traditional calculation of type Gl7 insulated oil tank truck was pr esented in the paper. The process of heat transfer is a non-stable process because the oil temperature in truck is decreased with the elapse of time. The calculation is taken oil tank truck as an example, the calculation methods are valuable to some liquid vessel with insulated layer, and large space in which natural heat transfer,and forced heat transfer occure.

本文提出了“G17”型保温油罐车的传热计算方法。由于罐车内石油温度是随时间衰减的,因此传热称之为非稳定过程。虽然计算是以油罐车为特例,但就计算方法而言,对一些具有保温层的大气空间自然放热特征和强制对流放热特征的液体容器,也有一定的参考价值。

Natural heat transfer and flow patterns in a cylindrical annulus filled with saturated porous medium were numerically studied. The inner wall of the annulus is heated locally at constant temperature and the outer wall is isothermally cooled in order to simulate the electronic element heat process. Numerical results show that effects of Ra and κ on the tempreture and velocity fields are significant. The center of core flow moves to upper and outer wall as Ra and κ increase and convective...

Natural heat transfer and flow patterns in a cylindrical annulus filled with saturated porous medium were numerically studied. The inner wall of the annulus is heated locally at constant temperature and the outer wall is isothermally cooled in order to simulate the electronic element heat process. Numerical results show that effects of Ra and κ on the tempreture and velocity fields are significant. The center of core flow moves to upper and outer wall as Ra and κ increase and convective velocities are higher in the upper half than the lower half of the annulus. The local Nusselt number on the heated wall increases as κ increases and decreases as Z increases, and the case is reversed on the outer wall. The average Nusselt number on the heated wall increases as Ra and κ increase and the average Nusselt number is correlated by a relation of the form Nui=mRan.

对内壁面局部恒温加热,外壁面恒温冷却,其它壁面保持绝热条件下的竖直同心套管内多孔介质中的自然对流进行了数值研究,分析了瑞利数Ra、半径比κ及高宽比A对流场和温度场、内外壁面局部努塞尔数和加热段的平均努塞尔数的影响。研究结果表明:Ra及κ对速度和温度的分布影响显著,随着Ra和κ的增加,环流中心向上部和外壁面偏移,上部流速度远大于下部。内壁面加热段局部努塞尔数沿Z方向降低,但随κ的增加而增加;外壁面的局部努塞尔数变化与内壁面相反。加热段平均努塞尔数Nui随Ra及κ的增加而增加,根据计算结果得到了平均努塞尔数与瑞利数的关联式Nui=mRan。

An experimental investigation was carried out on the characteristics of the frost layer during the initial growth period which developed on a cold flat plate under natural convection conditions. The cold plate temperatures were varied in the-34 to-19 ℃ range. A series of microscopic observation was conducted with the aid of a video microscope. The frost-air interface temperature and the temperature distribution above the interface were measured by employing two-exposure holographic interferometry technique....

An experimental investigation was carried out on the characteristics of the frost layer during the initial growth period which developed on a cold flat plate under natural convection conditions. The cold plate temperatures were varied in the-34 to-19 ℃ range. A series of microscopic observation was conducted with the aid of a video microscope. The frost-air interface temperature and the temperature distribution above the interface were measured by employing two-exposure holographic interferometry technique. The heat flux on the plate and the variation of frost layer with time were also measured. The effective thermal conductivity of frost layer and the natural convective heat transfer coefficient were obtained based on the experimental measurements in the present study. An empirical correlation for the heat transfer coefficient was obtained. The significant difference of characteristics between the initial growth period and the full growth period was found. With the growing of frost layer in the initial growth period, the frost surface temperature is gradually increasing, and the frost growth rate, the effective thermal conductivity and the natural heat transfer coefficient are decreasing. The heat transfer coefficient and the frost growth rate are increasing with the decreasing of the cold plate temperature, while the influence on the effective thermal conductivity is not remarkable. The effective thermal conductivity is the ice thermal conductivity of 11.7 % to 1.7 %.

对自然对流条件下水平表面的初始结霜过程进行了实验研究.在壁温为-34~-19℃范围内,利用显微镜对霜层成长过程进行了一系列显微观测,应用双曝光全息干涉法测量了霜层表面温度和周围温度分布,还测量了通过冷壁面的热流密度和霜层厚度随时间的变化.获得了霜层有效导热系数和霜表面与环境空气间的自然对流传热系数,并关联为准则关系式.霜层初始成长阶段与充分成长阶段有着显著不同的特性.随着霜层的形成和成长,霜层表面温度逐渐升高,霜层厚度增加速率减缓,有效导热系数迅速降低,自然对流传热系数也减小.冷壁面温度低时,自然对流传热系数较大,霜层成长初期厚度增加也较快,但对有效导热系数影响不大,仅为冰导热系数的117%~17%.

 
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