Construction of Sodium Heat-Pipe Furnaces and the Isothermal Characteristics of the Furnaces

Yan, Xiang-Ping; Duan, Yulong; F., C.; Lv, Zengxiang

doi:10.1007/s10765-011-0933-y

Cited by 19 publications

(14 citation statements)

References 7 publications

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“…Unfortunately, this type of heat pipe is uncommon in the literature as well as in industrial applications [8,9,[11][12][13]. Yan et al [12] reported an excellent temperature flattening ability using annular sodium heat pipes operating from 500 to 1200 • C. Their experimental results showed that the largest temperature difference within 150 mm at the bottom of the thermometer is better than 15 mK in the aluminum point cell installed in the sodium heat pipe furnace, which was controlled to about 657 • C. Choi et al [13] investigated a concentric annular heat pipe with almost half area heating. Their work presents an isothermal, low-temperature (200-300 • C range) heat pipe furnace for a metallic nanoparticle sintering process.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink

et al. 2020

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A concentric annular heat pipe heat sink (AHPHS) was proposed and fabricated to investigate its thermal behavior. The present AHPHS consists of two concentric pipes of different diameters, which create vacuumed annular vapor space. The main advantage of the AHPHS as a heat sink is that it can largely increase the heat transfer area for cooling compared to conventional heat pipes. In the current AHPHS, condensation takes place along the whole annular space from the certain heating area as the evaporator section. Therefore, the whole inner space of the AHPHS except the heating area can be considered the condenser. In the present study, AHPHSs of different diameters were fabricated and studied experimentally. Basic studies were carried out with a 50 mm-long stainless steel AHPHS with diameter ratios of 1.1 and 1.3 and the same inner tube diameter of 76 mm. Several experimental parameters such as volume fractions of 10–70%, different air flow velocity, flow configurations, and 10–50 W heat inputs were investigated to find their effects on the thermal performance of an AHPHS. Experimental results show that a 10% filling ratio was found to be the optimum charged amount in terms of temperature profile with a low heater surface temperature and water as the working fluid. For the methanol, a 40% filling ratio shows better temperature behavior. Internal working behavior shows not only circular motion but also 3-D flow characteristics moving in axial and circular directions simultaneously.

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Section: Introductionmentioning

confidence: 99%

Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink

et al. 2020

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“…For different conditions, the annular heat pipe can be heated at one side and cooled at the other side as the cylinder heat pipe to transfer a lot of heat [12][13], or heated at the outer pipe and cooled at the inner pipe to provide a uniform temperature zone [14][15][16]. The annular heat pipe is mainly used as a temperature stabilizing device to reduce the influence of the heating equipment on the stability of temperature distribution in the field of measurement [17][18]. Annular heat pipes are usually used with freezing points such as aluminium or silver freezing points.…”

Section: Introductionmentioning

confidence: 99%

“…Annular heat pipes are usually used with freezing points such as aluminium or silver freezing points. The heat source heated the outer wall of the outer pipe of annular heat pipe, the temperature of the freezing point can be maintained at the melting point in the inner pipe of annular heat pipe when the freezing point is in the solid-liquid mixing state [18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Effects of the Wick Structure of an Annular Heat Pipe on the Isothermal Performance

Zhang¹,

Ye²,

Guo³

et al. 2020

World Congress on Momentum, Heat and Mass Transfer

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This paper presents a numerical work on the effect of wick construction on the isothermal performance of an annular heat pipe. Two type connection wick structures were designed, the axial direction connection wick structure and radial direction connection wick structure. A three-dimensional symmetrical model with liquid-vapor phase transition was built. The isothermal performance of the annular part at the front end of the heat pipe was good, the temperature of liquid pool part was about 5-6 K higher than the annular part, and the isothermal performance of axial direction connection wick structure is better than radial direction connection wick structure. The influence of the wick on the vapor flow will affect the vapor temperature distribution, the isothermal surface distribution is obviously the same as the form of the axial direction connection wick at the outlet of the liquid pool, and the isothermal surface will rotate with the axial direction connection wick structure.

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“…We are planning to use an isothermal liner heat pipe outside the interrogation region to improve the temperature uniformity. Heat pipes are effective thermal control devices, have been widely applied in broad areas [15]. The performance of a mock up isothermal liner is tested, and the results show reduced temperature fluctuations and better temperature uniformity with this heat pipe.…”

Section: Introductionmentioning

confidence: 99%

Reducing the blackbody radiation shift in the NIM new fountain design

Fang

Liu

Yan

et al. 2013

2013 Joint European Frequency and Time Forum &Amp; International Frequency Control Symposium (EFTF/IFC)

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We are developing a new Cs fountain frequency standard in NIM, and shooting for the frequency uncertainty of a few parts in 10 16 . The new fountain will run in a lab with the temperature fluctuation of 0.3K, and no active temperature control system will be added outside the flight tube. Instead, an isothermal liner will be surrounded the flight tube. It is a special type of heat pipe, made of a thin layer of vacuum tube filled with pure water. The thermal conductivity of a glass isothermal liner is about 10 times higher than that of coppers. It also works like a low pass filter reducing the temperature fluctuations of the system. The advantage of using an isothermal liner is to make the temperature of the whole interrogation region more uniform and stable. With precision standard Pt thermometers measuring the temperatures of a few locations of the flight tube, the average temperature uncertainty is less than 50 mK. The frequency shift due to the blackbody radiation can be calculated, and the relative frequency shift due to black body radiation can reach down to 7.2E-17 of this new fountain clock.

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Construction of Sodium Heat-Pipe Furnaces and the Isothermal Characteristics of the Furnaces

Cited by 19 publications

References 7 publications

Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink

Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink

Numerical Study on the Effects of the Wick Structure of an Annular Heat Pipe on the Isothermal Performance

Reducing the blackbody radiation shift in the NIM new fountain design

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