Linear thermal expansion of artificial graphites to 1,370-degrees-C

Burdick, M. D.; Zweig, Barry; Moreland, R.E.

doi:10.6028/jres.047.006

Cited by 9 publications

(2 citation statements)

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“…The chemical composition and mechanical properties of the ASTM A240 Grade 316 stainless steel are listed in Table 3. Thermal and mechanical properties of A240-316 (retainer and steel layer), A216 Wrought Carbon with Grade B (WCB) (body), and graphite according to the temperatures (25 • C~350 • C) are listed in Table 4 [16,22,23]. Thermal-structural coupled analysis was conducted to calculate contact stress considering deformation caused by the thermal loads and the working pressure (1 MPa).…”

Section: (Step 4)mentioning

confidence: 99%

Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants

et al. 2019

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In combined cycle power plants (CCPPs), the bypass butterfly valve is a key component to facilitate regulation of exhaust gas energy available at the turbine and to not produce too much boost pressure. The conventional damper valve causes leakage, back flow into the turbine, and damage of the blade, and the existing dual-layered seal with polytetrafluoroethylene (PTFE) and metal should be frequently replaced owing to its low durability and deterioration of mechanical properties under a high temperature. This study devised a triple offset butterfly valve with a new type of seal by alternatively laminating stainless steel and graphite to improve valve performance at the high temperature (350 °C). The slope angles of the seal contact surface to prevent friction were calculated using the mathematical models of the triple offset. Thermal-structure coupled analyses by varying the number of graphite and thickness were conducted, and the seven-layer model with the graphite thickness of 0.8 mm, which shows airtightness and smooth operation, was chosen. The contact stresses behaviors of the graphite at 350 °C and at −196 °C were investigated, and it was found that the graphite is in charge of improving driving performance of the disc at the high temperature and sealing performance at the cryogenic temperature. The performance tests and the field tests of the suggested model verified its performance at the working temperature.

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Section: (Step 4)mentioning

confidence: 99%

Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants

et al. 2019

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“…In high-temperature design applications it is important following conclusions: (1) the coefficient of expansion of to know the mean coefficients of linear thermal expansion graphite usually undergoes a gradual increase with of synthetic graphite over temperature intervals from increase in temperature; (2) specimens cut perpendicular room temperature to the region of 500O0F. This study, the to the grain direction have greater expansions than specifirst of a series in a high-temperature thermal expansion mens cut parallel to the grain direction.…”

Section: Introductionmentioning

confidence: 99%

The Thermal Expansion of Synthetic Graphites at Temperature Intervals Between 80 and 2000f

Allen¹

1959

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The mean linear and cubical coefficients of thermal expansion of eight commercial lots of graphite were determined for temperature intervals between 80 and 2000°F. The linear thermal expansion was measured with an automatic recording dilatometer using a rod-shaped specimen 2 in. long and ?4 in. across. The specimen was heated in an atmosphere of helium. The results are in good agreement with those of Currie, Hamister, and MacPherson. The mean linear coefficient y a s found to increase with temperature. For the lots studied, the mean linear coefficients from 80 to 2000°F were 1.50 to 2.34 X 10-'//"F parallel and 2.26 to 3.45 X 10-'//"F perpendicular to the grain and were found to vary linearly with the electrical resistivity measured at 32°F.

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Some measurements on undercutting cold air

Berson

1958

Quart J Royal Meteoro Soc

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S m YFrom time series of closely-spaced upper-wind (pilot-balloon) measurements in the rear of synoptic lines of wind shift and cooling, the configuration of the elevated wind-shear layer and the strength of the flow beneath are deduced. The height of the shear layer does not rise uniformly with time, but at one stage remains constant or decreases, before resuming a sustained rise. It is demonstrated by the method of dynamic similarity that this phenomenon is broadly the counterpart of the friction head on density surges in stratified liquids.Cumulative inflow into the advancing wedge of cold air is compared with the total mass in the cold air wedge and found to be generally in excess of this, the exceptions occurring with sea-breezes or analogous phenomena on a larger scale (coastal fronts). In one case where sufficient observations are available, vertical velocities are computed. The excess inflow is shown to be associated with a vertical circulation involving considerable mass transfer upward across the shear zone.

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Linear thermal expansion of artificial graphites to 1,370-degrees-C

Cited by 9 publications

References 0 publications

Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants

Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants

The Thermal Expansion of Synthetic Graphites at Temperature Intervals Between 80 and 2000f

Some measurements on undercutting cold air

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