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管外换热
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    1-3 are 7.0-8.8 times,9.0-10.8 times and 9.9-12.0 times of that of the smooth tube,respectively.
    1-3管的管外换热系数分别是光管的7.0-8.8倍,9.0-10.8倍,9.9-12.0倍。
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    And at the same time, correlations for the performance of heat exchangers were developed.
    同时整理出了换热器管内及管外换热及阻力性能曲线和实验关联式。
短句来源
    And secondly, the study is on the performance of heat transfer outside the snake tube of the evaporator of SLHP in the chemical reactor.
    第二部分为蛇形回路热管在化学反应器内的蒸发段管外换热性能研究;
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    The influences of the heat transfer condition outside an oscillatory tube on the optimum exciting frequency and the characteristics of the oscillatory flow inside the tube have been experimentally investigated.
    实验研究了管外换热状况对振荡管最佳射流激励频率及管内振荡流特性的影响。
短句来源
    Two kinds of heat transfer type, the natural convection and the forced ones, are adoptted in the experiments and the heat transfer effect is quantitatively evaluated by the average heat transfer coefficient ( ).
    采用自然对流及强制对流(轴向水冷却)两种不同的管外换热形式,并用管外平均对流换热系数α来定量评价管外换热状况。
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An exprimental research was conducted on the heat transfer coeffictiene and resistance pressure drop of a sequential finned pipe column in a lowspeed wind tunnel. In the research, heat pipes were adopted as heating elements instead of a traditional steam boiler. Therefore, the experimental equipment became simple and had an advantage of sufficient reducibility. When the relational expression of the sequential finned pipe column which had been obtained in the experiment was compared with the exprimental data...

An exprimental research was conducted on the heat transfer coeffictiene and resistance pressure drop of a sequential finned pipe column in a lowspeed wind tunnel. In the research, heat pipes were adopted as heating elements instead of a traditional steam boiler. Therefore, the experimental equipment became simple and had an advantage of sufficient reducibility. When the relational expression of the sequential finned pipe column which had been obtained in the experiment was compared with the exprimental data of a stagger finned pipe column, the experimental results showed that the heat transfer coefficient of the sequential finned pipe column is approximately 10~20% lower than that of the stagger finned pipe column, and the resistance pressure drop of the former is less than half that in the latter. This implies that the sequential finned pipe column is attractive when a very low pressure drop is required.

在一低速风洞中,对顺排翅片管束的管外换热系数和阻力降进行了实验研究。采用热管作为加热元件,而不采用传统的蒸汽锅炉,使实验设备简单并具有充分的可折换性,得到了顺排管束的实验关联式,并与叉排翅片管束的实验数据进行了比较。发现,顺排管束的换热系数约为叉排管束的(80—90)%;顺排管束的阻力降比叉排管束有明显的降低,前者约为后者的一半左右。这说明,在阻力降要求特别低的场合,采用顺排排列的翅片管束是有吸引力的。

The influences of the heat transfer condition outside an oscillatory tube on the optimum exciting frequency and the characteristics of the oscillatory flow inside the tube have been experimentally investigated. Two kinds of heat transfer type, the natural convection and the forced ones, are adoptted in the experiments and the heat transfer effect is quantitatively evaluated by the average heat transfer coefficient ( ). The results show that in case of natural convection( =14.5W/m 2·℃), f opt ...

The influences of the heat transfer condition outside an oscillatory tube on the optimum exciting frequency and the characteristics of the oscillatory flow inside the tube have been experimentally investigated. Two kinds of heat transfer type, the natural convection and the forced ones, are adoptted in the experiments and the heat transfer effect is quantitatively evaluated by the average heat transfer coefficient ( ). The results show that in case of natural convection( =14.5W/m 2·℃), f opt is increased by 20% as the expansion ratio ε is changed from 2.0 to 6.0. When the heat transfer is intensified ( =1 140 W/m 2·℃), the value of f opt is significantly decreased and is hardly influenced by ε , and this effect of f opt is called “clamping effect” in this paper. The mechanism and application prospect of the clamping effect are also discussed.

实验研究了管外换热状况对振荡管最佳射流激励频率及管内振荡流特性的影响。采用自然对流及强制对流(轴向水冷却)两种不同的管外换热形式,并用管外平均对流换热系数α来定量评价管外换热状况。研究表明,自然对流(α=14.5W/m2·℃)时,最佳射流激励频率fopt随膨胀比的增大而显著增大;强化管外传热后(α=1140W/m2·℃),振荡管的制冷效率明显提高且受射流激励频率的影响变小,同时,fopt显著降低且几乎不随膨胀比而变化,本文将这一现象称为“钳制效应”。文中对钳制效应的机理及应用前景进行了分析与讨论

The oscillatory tube respresents a simple arrangement for gas cooling by its decompression,and has many applications in chemical processes and energy transformation. The mechanism of the cooling effect of oscillatory tube is the conversion of the pressure energy of gas to heat through the movement of pressure waves,which are moving shock wave and unsteady expansion wave. The radial heat transfer through the tube wall will influence the performance of the oscillatory tube significantly. In the present paper,...

The oscillatory tube respresents a simple arrangement for gas cooling by its decompression,and has many applications in chemical processes and energy transformation. The mechanism of the cooling effect of oscillatory tube is the conversion of the pressure energy of gas to heat through the movement of pressure waves,which are moving shock wave and unsteady expansion wave. The radial heat transfer through the tube wall will influence the performance of the oscillatory tube significantly. In the present paper, the effects of heat transfer conditions outside of an oscillatory tube on the performance of the tube are investigated experimentally. In the experiments,two kinds of typical heat transfer conditions,natural convection and forced convection(axially water cooled),are studied. The oscillatory tube is a red copper tube,14 mm in diameter and 4 2 m in length. The pressure ratio is in the range of 2 0—6 0. The ambient temperature is 15 ℃. The inlet temperature of the cooling water is 17 7 ℃ at a flow rate of 0 81 kg·s -1 . The experimental results show that the refrigerating efficiency of the tube is increased by 4 6%—5 4% when the heat transfer condition outside the tube wall is improved by axial water cooling. Also,the optimum pulsing frequency ( f opt ) of the driving jet flow is reduced significantly and the value of f opt is no longer affected greatly by the pressure ratio when the heat transfer outside of the tube is intensified. The theoretical analyses of the experimental results are also presented.

管外换热状况对振荡管性能的影响进行了实验研究及理论分析 .实验中采用自然对流及强制对流 (轴向水冷却 )两种典型的管外换热型式 .结果表明 :改善振荡管外的传热状况 ,可使振荡管的冷效应显著增强 ,在膨胀比ε=2 0~ 6 0的范围内可使制冷效率提高 4 6%~ 5 4% ,同时可使最佳射流激励频率 fopt降低且膨胀比对fopt值不再有明显影响 对导致上述结果的内在机制进行了探讨

 
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