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气体对流
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  gas convection
     10 mL distilled water was injected into the oxygen vessel of SDACM3000 calorimeter in order to make the crucible's bottom immersed in the water,which made the heat exchange manner from gas convection to liquid conduction.
     在SUNDYSDACM3000量热仪的氧弹内加入10mL蒸馏水,使得氧弹内盛装被测样品的坩埚与仪器测试介质间由气体对流热交换改变为强制液体传导热交换;
短句来源
     In order to investigate the effect of electric field on gas convection heat transfer, the mathematical model of the distributions of electric field and charge density was established on the basis of field domain governing equations, and the electric field lines coordinate method was employed to simulate the distributions of electric field, potential, charge density and force exerted on the single phase gas in the wire-plane electrode numerically.
     为研究电场对气体对流换热的影响,依据场域控制方程,建立了表征电场及电荷密度分布的数学模型,并利用场线坐标法对线-板电极系统的电场、电位及电荷密度的分布进行了数值模拟,得到了场域空间单相气体所受电场力的分布情况.
短句来源
     The degree of gas convection can be characterised by the Rayleigh number (Re)and the degree of heat-transfer by gas convection can be characterised by Nusselt number( Nu ) in the crystal growth of oxides by means of CZ method.
     引上法生长高温氧化物晶体时,热腔中的气体对流状态由雷诺数(Re)决定,气体对流传热由努赛尔数(Nu)决定。
短句来源
     Gas Convection in Crystal Growth by Czochralski Method
     引上法晶体生长中的气体对流
短句来源
     Low Vacuum as a Ground Simulation Method for Studies of Gas Convection Heat Transfer inside Manned Spacecraft.
     利用低真空环境在地面模拟载人航天器内部气体对流散热的探讨
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  “气体对流”译为未确定词的双语例句
     Study on Gas-Solid Reaction and Convection,Reaction and Diffusion of Gas
     气固反应与多组分气体对流反应扩散问题的研究
     The basic characteristics of gas convective diffusion of underground coal gasification (UCG) are studied.
     研究了煤炭地下气化气体对流扩散的基本特征 .
短句来源
     Advances in the study on convective heat transfer augmentation ofgas by corona discharge
     电晕放电强化气体对流换热研究进展
短句来源
     An Analytical Solution to the Problem of Convection, Diffusion of Multi-phase Gases with Gas-Solid Reaction
     多相气体对流扩散与气固反应问题的解析解
短句来源
     The difference between convective condensation Nusselt's condensation was illustrated.
     提出了混合气体对流凝结换热与Nusselt凝结的不同。
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  相似匹配句对
     ON CONVECTIVE EFFECTS IN GAS LASERES
     气体激光中的对流效应
短句来源
     Gas Convection in Crystal Growth by Czochralski Method
     引上法晶体生长中的气体对流
短句来源
     Phenomenon of the gas punching through.
     气体击穿现象。
短句来源
     The Emissivity of Gas
     气体黑度
短句来源
     antle convection
     地幔对流(讲座)
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  gas convection
Empirical coefficients of heat transfer from a fluidized bed to bodies of various shapes are compared with coefficients calculated from a formula which considers heat transfer by particle and gas convection and by radiation.
      
Additional contribution due to gas convection at high velocities can be simply modelled, by increasing the particle eddy conductivity suitably.
      
Outward transport of angular momentum by gas convection and the equatorial acceleration of the Sun
      
Gravitational effects on particle formation from vapours include gas convection and buoyancy and particle sedimentation.
      
Theoretical and experimental study of natural gas convection in a closed contour
      
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The R & D works of all-glass concentric tubular vacuum collectors are presented Borosilicate glass is being used. Calculations showed that the heat loss due to conduction and convection might be ignored when the pressure is lower than 5×10-5 Torr. An appropriate outgassing process has been developed. The water temperature in the tube has been kept at 95× for 6000 hrs while the pressure in the vacuum jacket was lower than 5×10-5 Torr, it may be considered that the collector tube has long vacuum life time.The...

The R & D works of all-glass concentric tubular vacuum collectors are presented Borosilicate glass is being used. Calculations showed that the heat loss due to conduction and convection might be ignored when the pressure is lower than 5×10-5 Torr. An appropriate outgassing process has been developed. The water temperature in the tube has been kept at 95× for 6000 hrs while the pressure in the vacuum jacket was lower than 5×10-5 Torr, it may be considered that the collector tube has long vacuum life time.The selective coating being used is double layered black nickel electroplated onto the glass tube which has been chemically deposited with a copper layer in advance. This economical coating withstands the high temperature during outgassing process, and good optical properties (as = 0.89 -0.91, εn = 0.12 -0.15) have been obtained. Microscopic analysis indicated that the electrodeposited coating is amorphous piled small spheres with appropraite size, which improved the absorptance to solar energy.The collector panels consist of 20 tubes, with a white diffuse reflector. The thermalperformance equation is as follows:η =0.53- 1.7ti-ta/I The time constant and the incident angle modifier tests and all-day efficiency have been conducted.

本文介绍了全玻璃同心圆管真空集热器的研制工作。采用透光率高、耐热急变性好的高硼硅玻璃做圆管。计算了气体热传导系数与真空度的关系,当压强为5×10~(-5)托时,气体的热传导为大气压下的0.1%,基本上消除了气体的对流与传导热损。选用了合理的排气工艺,并在管内使用了吸气剂。集热管内水温保持在95℃,经6000小时后真空套管中压强仍低于5×10~(-5)托,表明本集热管有长的真空寿命。 在玻璃表面上化学沉铜,再电镀双层黑镍选择性涂层,该涂层能耐受排气时的高温,光-热性能良好(α_s=0.89—0.91,ε_n=0.12—0.15)。微观分析表明,涂层由适宜尺寸的球形浮雕构成,它是一种无定形物质。采用这种选择性涂层制成的全玻璃真空集热管,成本较低,利于推广使用。 由20支全玻璃真空集热管经铜接头串联成一个单元集热器,背后为白色漫反射板。接头外有聚氨酯保温套。文中给出了集热器的单元流动阻力、冷冻试验结果、集热器的瞬时热效率方程(η=0.53-1.7(t_1-t_0)/I)、时间常数、入射角修正系数和日效率的测试结果。

In this paper, a simplified mathematical simulation of heat transfer in indirectly cooling zone of float glass annealing lehr was presented. In consideration of heat transfer by radiation in lehr and eonvective heat transfer of air in the cooling system. Heat transfer by radiation in lehr was caculated with Hottel's Zone Method The program of computer simulation is written with PASCAL. The mathematieal simulation can be improved the design and operation of lehr.

本文提出了浮法玻璃退火窑间接冷却区内传热过程的数值模拟方法.它考查了窑内的辐射换热和冷却系统中气体的对流换热,其中窑内辐射传热计算采用Hottel的区域法.模拟程序用PASCAL语言编写.模拟结果表明,利用数值模拟方法可以改进退火窑的设计和操作.

The profiles of local heat transfer coefficient along the axial direction of a probe were measured in a 8m tall, 186mm ID cold model fast flu-idized bed at different radial positions. All data were obtained by using a specially designed heat probe assembly. In the experiments elimination of axial thermal conduction and constant bulk density along the probe were ensured. The experiments show that regardless of the radial position where the probe is located, the local heat transfer coefficients decrease gradually...

The profiles of local heat transfer coefficient along the axial direction of a probe were measured in a 8m tall, 186mm ID cold model fast flu-idized bed at different radial positions. All data were obtained by using a specially designed heat probe assembly. In the experiments elimination of axial thermal conduction and constant bulk density along the probe were ensured. The experiments show that regardless of the radial position where the probe is located, the local heat transfer coefficients decrease gradually from top to bottom of the probe. It means that the particles always aggregate at the probe surface, forming a layer and moving downwards along the probe surface if the probe is large enough. In light of this mechanism, the experiments have confirmed that the local heat transfer coefficients are mainly dependent on the local bulk density around the probe and the particle renewal frequency at the surface, which in turn vary with gas velocity. The contribution of gas convection can be neglected in comparison with that of the transient heat transfer between particles and the probe surface.

在内径186mm、高8m的快速流化床内,采用特殊设计的组合式传热探头,考察了局部传热系数沿换热表面长度方向的分布规律.结果表明,只要传热表面积足够大,设置于床层径向的任何位置,都可能诱导颗粒聚集,并在传热表面形成从上向下运动的絮状物层,从而使局部传热系数沿换热表面向下逐渐降低.实验结果预示,对具有较大尺寸的换热表面,影响传热系数的主要因素是局部颗粒密度及颗粒在表面的更新颇率.气体对传热的贡献主要是通过改变颗粒在传热表面的更新频率,影响颗粒非稳态导热过程而实现的.相比之下,气体对流传热的贡献可以忽略.

 
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