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空气自然对流     
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  air natural convection
     The above features enable gravity heat pipes to use in the field of solar heat. Between glass-cover board and endothermic board, honeycomb is placed, which can eliminate heat loss caused by air natural convection and greatly reduce heat loss caused by radiation, and hence a better transfer heat efficiency.
     而在透明玻璃盖板和吸热板之间放置蜂窝结构,基本上能消除吸收表面和盖板之间的空气自然对流热损失,并可大大降低辐射损失,显著提高集热器的热转换效率。
短句来源
     To a straight wall with air natural convection, the real temperature and total emissivity of the surface and the cold ambient temperature could he measured by the infra-red systems mentioned above so that the total heat flow of that surface may be determined.
     对于竖壁空气自然对流表面,用上述红外系统测量出该表面的真温度和全发射率值以及冷环境温度,便可确定出该表面的全热流。
短句来源
     The results show that different magnetic accelerations can be supplied by different permanent magnet system configurations in the concerned field,and different magnetic forces can be formed to influence the air natural convection.
     研究表明 ,不同的永磁系统布置可在工作空间形成不同的磁加速度分布 ,产生不同的磁场力 ,从而影响空气自然对流换热的强弱
短句来源
  air convection
     Under the condition of air convection and heat radiation, the temperature field distribution of furnace hood section under loss by furnace lining burning is analyzed with finite element, which can provide reference for operation.
     以有限元为手段 ,分析了在空气自然对流和热幅射条件下 ,转炉炉衬不断烧损时炉帽部分的温度场分布。 以便为生产操作提供依据
短句来源
     The air flow and heat transfer inside a -65℃ freezer is studied in the paper. A computer programme using the method of Simple is developel to compute the air convection in freezer.
     用Simple方法计算-65℃冷柜内空气自然对流,得到了冷柜内各个点空气的物性参数.
短句来源
  “空气自然对流”译为未确定词的双语例句
     Three types of air natural convections in a two-dimensional square enclosure are numerically simulated.
     以二维封闭方腔内空气自然对流为对象,分别对三种不同的自然对流形式进行了数值模拟。
短句来源
     Under the conditions of free convection for air,extra-voltage of 33? kV,and liquid flow rate of 80?
     在空气自然对流、外加电压为33 kV和液体流量为80 mL/min的条件下,对E.
短句来源
     The paper introduced the application of virtual instrument in the natural convection experiment of horizontal pipes fixed in a large space, and provided some useful experience in updating and altering the conventional apparatuses and equipments for the purpose of improving the level of experimental teaching.
     介绍了虚拟仪器在大空间水平圆管空气自然对流传热实验中的应用,为更新改造传统仪器设备、提高教学实验水平提供了可借鉴的经验。
短句来源
     Numerical simulation of indoor natural convection heat transfer
     室内空气自然对流换热的数值模拟研究
短句来源
     Two pyrometers and one usual thermometer are used to obtain the temperature,emissivity of a hot wall and the temperature of the background respectively.
     用这两台辐射温度计同时测得璧面温度和黑度,用一般温度计测得冷环境的温度,对于竖璧空气自然对流表面,根据上述测得的各量可直接算出全热流。
短句来源
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  相似匹配句对
     NATURAL CONVECTION OF A VERTICAL ARRAY IN AIR
     垂直管排对空气自然对流换热
短句来源
     Radiation in Air Natural Convection Around Horizontal Pipe
     空气在横管外自然对流中的辐射影响
短句来源
     OSCILLATION AND BIFURCATION OF NATURAL CONVECTION OF HORIZONTAL AIR LAYER HEATED FROM BELOW
     水平空气自然对流换热的分岔和振荡
短句来源
     Numerical simulation of indoor natural convection heat transfer
     室内空气自然对流换热的数值模拟研究
短句来源
     An Experiment on the Forced and Natural Convection Heat Exchange of Air in a Vertical Tube
     竖管内空气强迫与自然对流换热实验
短句来源
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  air convection
Effect of Atmosphere Temperature near the Soil Surface on Air Convection in Mammalian Burrows (as Exemplified by of Steppe Marmo
      
The starting characteristics of OHP are studied in the range of heat loads from 30 to 100 W under conditions of cooling by way of natural and forced air convection.
      
Effect of corona discharge on heat transfer in natural air convection
      
Results are presented of an experimental and theoretical investigation of the effect of a corona discharge on heat transfer from a thin wire under natural air convection conditions.
      
Stability of the air convection in a two-layer cover of snow.
      
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An on-line method of measuring total heat flow on the surface of a solid is presented in this paper,by which the total heat flow can be measured without contact.Two pyrometers and one usual thermometer are used to obtain the temperature,emissivity of a hot wall and the temperature of the background respectively.In terms of the natural convection of a vertical wall,the total heat flow can be calculated by the above-mentioned three factors.This new method can be used to the diagnosis of hot equipments and the...

An on-line method of measuring total heat flow on the surface of a solid is presented in this paper,by which the total heat flow can be measured without contact.Two pyrometers and one usual thermometer are used to obtain the temperature,emissivity of a hot wall and the temperature of the background respectively.In terms of the natural convection of a vertical wall,the total heat flow can be calculated by the above-mentioned three factors.This new method can be used to the diagnosis of hot equipments and the monitoring of furnace lining with the temperature higher than 300℃.

本文提出一种在线全热流测量法,是用两台前置反射器辐射温度计(一台带反射器,另一台带吸收器)以非接触方式实现的。用这两台辐射温度计同时测得璧面温度和黑度,用一般温度计测得冷环境的温度,对于竖璧空气自然对流表面,根据上述测得的各量可直接算出全热流。对于300℃以上的表面全热流,相对误差在6%以内。这种在线全热流测量法可用于热设备的诊断和炉衬管理。

A new method and its theory used for on-line measurement of surface total heat flow of heat equipment are presented in this paper. This kind of measured method is realized by two sets of infra-red systems in non-contact condition. To a straight wall with air natural convection, the real temperature and total emissivity of the surface and the cold ambient temperature could he measured by the infra-red systems mentioned above so that the total heat flow of that surface may be determined. To some surfaces with...

A new method and its theory used for on-line measurement of surface total heat flow of heat equipment are presented in this paper. This kind of measured method is realized by two sets of infra-red systems in non-contact condition. To a straight wall with air natural convection, the real temperature and total emissivity of the surface and the cold ambient temperature could he measured by the infra-red systems mentioned above so that the total heat flow of that surface may be determined. To some surfaces with temperature higher than 200℃ and emissivity bigger than 0.6, the systematical error of measured total heat flow is within 4 per cent.

本文提出一种在线测量热设备表面全热流的新方法相该方法的理论。这种测量方法是用两套红外系统以非接触方式实现的。对于竖壁空气自然对流表面,用上述红外系统测量出该表面的真温度和全发射率值以及冷环境温度,便可确定出该表面的全热流。对于200℃以上、发射率大于0.6的表面,所测全热流的系统误差在4%以内。

Experimental and numerical investigation on natural convection in a rectangular enclosure with three horizontal power cables in the range of Gr = 9.2×104-6.5×106 has been reported. Two different circulations were visualized: main stream is large and circulate clockwise; the other is a smaller vortex circulated anti-clockwise. With the decrease in Gr, the anti-clockwise vortex becomes smaller in dimension and weaker in rotation. The bouyancy force at Gr = 6.5×106 lead to forming a pair of vortices between the...

Experimental and numerical investigation on natural convection in a rectangular enclosure with three horizontal power cables in the range of Gr = 9.2×104-6.5×106 has been reported. Two different circulations were visualized: main stream is large and circulate clockwise; the other is a smaller vortex circulated anti-clockwise. With the decrease in Gr, the anti-clockwise vortex becomes smaller in dimension and weaker in rotation. The bouyancy force at Gr = 6.5×106 lead to forming a pair of vortices between the power cables. Zinc stearate particles has proved out to be a good trace material for visual display of natural convection flow pattern in enclosure. Using the method of the false transient, the computer time for solving equations (1)-(6) can be substantially reduced and the stability of numerical iteration process can be ensured. The obtained results provide a theoretical basis for designing the ampere-capacity of the power cables in covered tray.

采用数值计算和流动显示方法,对矩形封闭空间内水平放置三根电缆所引起的自然对流,在Gr~*=9.2×10~4—6.5×10~6范围内进行了理论和实验研究。结果表明,这种情形下的自然对流流动存在着环流。在低Gr~*数时,在电缆上方形成主环流;随着Gr~*数的增大,在电缆间出现涡流;在Gr~*=6.5×10~6时,电缆间出现成对的涡流。实验结果表明,硬脂酸锌粉粒是显示空气自然对流流动的比较理想材料。采用伪非稳态变系数方法是保证计算收敛而又节省机耐的有效方法。计算结果为设计该类型电缆的最大允许载流量提供了依据。

 
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