Tests on a passive-control heat pipe

Measurements have been made on the thermal stabilization provided by a gravitational thermal pipe containing a controlling piston.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 54, No. 6, pp. 1014–1017, June, 1988.     

Compressor-adsorber with a heat pipe

A design and mathematical model of a compressor-adsorber employing a heat pipe are described. Based on numerical solution, the effect of the finning parameters on adsorber efficiency is analyzed. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute of the Academy of Sciences of Belarus,” Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 4, pp. 531–539, July–August, 1996.     

Dynamics of a bounded gas cavity in a pipe

The dynamics of a gas cavity formed in a pipe in the zone of flow separation behind a cavitating body, and bounded by a diaphragm mounted at a pipeline exit, is considered. A mathematical model is proposed, on the basis of which the stability of the flow under consideration is investigated.Translated from Inzhenerno-fizicheskii Zhurnal, Vol. 61, No. 4, pp. 578–585, October, 1991.     

折光腔法鉴相式大长度测量仪检定方法

大长度测量仪检定工作一般在野外基线场上进行,耗时费力、强度高效率低、受环境影响严重等问题一直困扰计量检定人员。为改变这一落后作业模式,在手持激光测距仪室内检定装置研制成功的基础上,该文提出基于折光腔法与虚拟基线理论构造鉴相式大长度测量仪检定装置,拟将野外检定基线场完整搬入室内。利用费马原理设计的折光腔将长度1 000 m的光路压缩在数十米以内,利用光的反射定律推导出虚拟基线(室内大长度各段标准值)的计算方法,同时进一步提出检定装置的结构设计,技术参数及控制措施,并通过对系统潜在影响因素分析以论证该大长度室内检定装置的可行性。     

用于CPU冷却的集成热管散热器

提出了将立体蒸汽腔和热管两相传热结合,用于CPU冷却的集成热管散热器新概念,并对设计出的集成热管散热器的传热性能和整体的均温性进行了试验研究.试验结果表明,未优化的集成热管散热器的热阻在0.14℃/W～0.2℃/W之间,且整个散热器具有均匀的温度分布.与当前的热管散热器相比,这种结构的集成热管散热器具有散热效率高、结构紧凑、接触热阻小、重量轻、成本低等特点,可以满足未来大功率CPU散热的要求.     

Mechanism for boiling of a liquid in heat pipe wicks

The authors describe a hypothesis that vapor-generating centers arise in the wicks of low-temperature heat pipes and a mechanism for activating these.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 47, No. 3, pp. 422–427, September, 1984.     

Comprehensive investigation of startup regimes for a frozen heat pipe

The authors describe results of an experimental investigation of startup of an ammonia heat pipe made of aluminum with longitudinal channels and radiative heat rejection. They determine the influence of the startup dynamics of the location of the frozen heat transfer agent and the slope of the heat pipe to the horizontal. They propose a simplified method of determining the startup characteristics when the main mass of heat transfer agent is frozen in the heater zone.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 59, No. 5, pp. 786–791, November, 1990.     

基于SINDA/FLUINT的低温回路热管整机仿真分析

基于热流分析软件SINDA/FLUINT,对低温回路热管进行了仿真模型分析,得到了它的工作温度、漏热、压降等随热负载的变化关系。将计算结果与实验进行对比,在一定的热负载范围内,仿真结果与实验结果吻合,验证了仿真模型的正确性。通过分析模型的计算结果,可为以后低温回路热管的设计和实验提供参考。     

液氢温区脉动热管试验台设计

总结了前人对低温脉动热管的研究成果,同时提出了液氢温区低温脉动热管试验台的设计方法,主要包括热负荷计算和力学校核.该试验台可以研究多种参数(如弯折数、充液率、绝热段长度、加热量等)对传热性能的影响.     

Laminar vapor flow in a heat pipe

Laminar vapor flow in the evaporation, adiabatic, and condensation sections of a heat pipe is considered. The problem is solved by using a parametric method. The solution resulted in a graphoanalytical method of determining the vapor-pressure loss in all sections of the pipe.     

Heat transfer in a centrifugal heat pipe

This paper presents experimental data and empirical relations describing the influence of heat flux density and vapor pressure on the heat transfer in a cylindrical heat pipe.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 33, No. 3, pp. 388–392, September, 1977.     

Space environment testing of a heat pipe

An experimental heat pipe for spacecraft temperature control systems has been tested in a space environment. The results of the test are described.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 31, No. 6, pp. 990–995, December, 1976.     

Convective heat transfer for a nonlinear viscoplastic medium in a circular pipe

Heat transfer is considered for a viscoplastic material of nonlinear type flowing with dissipation in a circular tube with developed laminar flow and boundary conditions of the first kind.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 19, No. 5, pp. 850–860, November, 1970.     

Failure analysis of bursting on the inner pipe of a jacketed pipe in a tubular heat exchanger

In order to identify the causes of a bursting incident that occurred on the inner pipe of a jacketed pipe in a tubular heat exchanger for synthesis of high pressure polyethylene, series of characterization analysis were conducted. Metallurgical structure and chemical composition of the pipe’s metal matrix were inspected by metallographic microscope (MM) and photoelectric direct reading spectrometer; scanning electron microscope (SEM) and energy dispersive spectroscope (EDS) were applied to observe the microscopic morphology and micro-area composition on the ruptured surface; compositions of the coolant, i.e. the circulating cooling water were examined by inductively coupled plasma-atomic emission spectrometry (ICP-AES), ion chromatography (IC) and Fourier transform infrared spectroscopy (FTIR). In addition to these, finite element analysis (FEA) was employed to study the erosive effect of on the pipe. Analysis results revealed that interaction between corrosion and erosion both led by scaling, was the main cause that accelerated its thinning and eventually resulted in its premature failure. Finally countermeasures and suggestions were proposed.     

Radiative-conductive heat transfer in a spherical cavity

High Temperature - A mathematical model describing joint radiative-conductive heat transfer in a spherical cavity, the shape of which can be considered as a statistical average in relation to the...     

Thermal behavior of a cryogenic loop heat pipe for space application

This paper discusses a prototype of cryogenic loop heat pipe (CLHP) working around 80 K with nitrogen as the coolant, developed at CEA-SBT in collaboration with the CAS/TIPC and tested in laboratory conditions. In addition to the main loop it features a pressure reduction reservoir and a secondary circuit which allow cooling down the loop from the room temperature conditions to the nitrogen liquid temperature and transferring the evaporator heat leaks and radiation heat loads towards the condenser. The general design, the instrumentation and the experimental results of the thermal response of the CLHP are presented, analyzed and discussed both in the transient phase of cooling from room temperature (i) and in stationary conditions (ii). During phase (i), even in a severe radiation environment, the secondary circuit helped to condense the fluid and was very efficient to chill the primary evaporator. During phase (ii), we studied the effects of transferred power, filling pressure and radiation heat load for two basic configurations of cold reservoir of the secondary circuit. A maximum cold power of 19 W with a corresponding limited temperature difference of 5 K was achieved across a 0.5 m distance. We evidenced the importance of the filling pressure to optimize the thermal response. A small heating power (0.1 W) applied on the shunted cold reservoir allows to maintain a constant subcooling (1 K). The CLHP behaves as a capillary pumped loop (CPL) in such a configuration, with the cold reservoir being the compensation chamber of the thermal link. The radiation heat loads may affect significantly the thermal response of the system due to boiling process of liquid and large mass transfer towards the pressure reduction reservoir.     

铝-氨热管换热器用于空调排风余热回收的研究

分析空调系统能量回收的特殊要求,试验研究冬季工况铝-氨热管换热器的性能及影响因素。结果表明,余热回收效率随新排风温差增大而升高,随风速的增大而降低。该换热器具有换热效果好、阻力小的特点,说明其在冬季空调余热回收是可行的,也是有效的。     

基于虚拟仪器的圆度仪的研究

在总结国内外圆度检测技术的发展及研究现状的基础上,提出了基于虚拟仪器采用CCD摄像方式来获取机械零件圆度检测信息的方法。对采集到的零件图片进行图像处理,得到零件的圆度特征信息,从而精确快速的检测出零件圆度误差和相关几何尺寸和形位公差,通过与标准件或设计要求的比较,判断出被测零件的圆度是否合格。实验表明本虚拟圆度仪,非接触测量,速度快,准确度高。     

热管技术在风洞工程中的应用初探

从风洞换热器的技术要求出发,简单介绍热管技术的优缺点。结合某型风洞换热器的设计（换热器结构参数）,对热管换热器与其他换热器进行比较,分析在风洞换热器中采用热管换热器的优势。