Cryogenic Materials Data Handbook (Revised). Volume I. Sections A, B, C.

Schwartzberg, F. R.; Osgood, Samuel H.; Bryant, Carol; Knight, Marvin

doi:10.21236/ad0713619

Cited by 6 publications

(2 citation statements)

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“…First, we start with the tape itself, some relevant parameters of which are given in Table 4. Then putting in numbers (see Table 4, and ref [17][18][19][20][21][22][23]), and ignoring for now the edges of the tape, we obtain, for conductor type 2,…”

Section: Tape Perpendicular (Radial) Thermal Conductancementioning

confidence: 99%

Thermal diffusion and quench propagation in YBCO pancake coils wound with ZnO and Mylar insulations

Sumption

Majoroš

Susner

et al. 2010

Supercond. Sci. Technol.

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The thermal diffusion properties of several different kinds of YBCO insulations and the quench properties of pancake coils made using these insulations were studied. Insulations investigated include Nomex, Kapton, and Mylar, as well as insulations based on ZnO, Zn 2 GeO 4 , and ZnO-Cu. Nomex, Kapton, and Mylar, chosen for their availability and ease of use, were obtained as thin ribbons, while the ZnO based insulations were chosen for their high thermal conductivity and were applied by a thin film technique. Initially, short stacks of YBCO conductors with interlayer insulation, epoxy, and a central heater strip were made and later measured for thermal conductivity in liquid nitrogen. Subsequently, three different pancake coils were made. The first two were smaller, each using one meter total of YBCO tape present as four turns around a G-10 former. One of these smaller coils used Mylar insulation co-wound with the YBCO tape, the other used YBCO tape onto which ZnO based insulation had been deposited.One larger coil was made which used 12 total meters of ZnO-insulated tape and had 45 turns.Temperature gradients were measured and thermal conductivities were estimated from these coils, the results obtained were compared to those of the short stacks. The results for all short 2 sample and coil thermal conductivities were ~1-3 Wm -1 K -1 . The lack of distinction for the ZnObased insulations was attributed to the presence of a thermal interface contact resistance. TheZnO insulations, while not strongly increasing the average thermal conductivity of the winding pack or coil, were much thinner than the other insulations, and would thus enable substantial increases in winding pack critical current density. Finally, quench propagation velocity measurements were performed on the coils (77 K, self field) by applying a DC current and then using a heater pulse to initiate a quench. Normal zone propagation velocity (NZP) values were obtained for the coils both in the radial direction and in the azimuthal direction. Radial NZP values (0.05-0.7 mm/s) were two orders of magnitude lower than axial values (~14-17 mm/s).Nevertheless, the quenches were generally seen to propagate radially within the coils, in the sense that any given layer in the coil is driven normal by the layer underneath it. This initially surprising result is due to the fact that while the radial normal zone propagation velocity (NZP) is much lower than the NZP along the conductor (∼100 x) the distance the normal zone must expand longitudinally is much larger than what it must expand radially to reach the same point, in our case this ratio is ~ 1600.Keywords: YBCO, Coated conductor, Quench, Stability, thermal conductivity varied; sometimes they were performed in vacuum, or more frequently under gas cooling. More recently, results for quench measurements of small coils of YBCO are becoming available [6,7], although much work remains to be done. Of course, as it was for other magnet/conductor systems, insulation is very important. One of the key issues is ...

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Section: Tape Perpendicular (Radial) Thermal Conductancementioning

confidence: 99%

Thermal diffusion and quench propagation in YBCO pancake coils wound with ZnO and Mylar insulations

Sumption

Majoroš

Susner

et al. 2010

Supercond. Sci. Technol.

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“…This scenario simulates the case in which liquid nitrogen is flowing in the test section with a maximum pressure of 100bar. Mechanical properties were derived from different cryogenic databases available for Stainless steel 316, Titanium Grade 5/Ti-6AI-4V and Quartz Glass materials: thermal conductivity, specific heat, Young Modulus, density, Poisson ratio [4] [9] [10] [12], and thermal expansion coefficient [11]. Yield Strength properties have been based on manufacturer datasheet at ambient temperature (3D printing material Stainless Steel 316L [13]), although a factor of 𝜎 100𝐾 𝜎 300𝐾 ⁄ = 1.4 is reported for the ratio between cryogenic and ambient temperatures [12].…”

Section: Fem Thermal-mechanical Analysismentioning

confidence: 99%

Design and Analysis of a Cryogenic Unsteady Flow Experiment through a Propellant Assisted Valve

Pinho¹,

Magette²,

Scelzo³

et al. 2023

World Congress on Momentum, Heat and Mass Transfer

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This paper provides a technical assessment of the design definition and justification of an experimental activity to be conducted on unsteady cryogenic flows through valves and orifices with nitrogen. The primary application of this study serves engine propellant assisted valves used in space launchers, but it is expected that results can also be extended and valorised to other sectors dealing with cryogenic flows. This research aims at understanding the challenging flow physics occurring in cryogenic valves dealing with both liquid and vapour fluid state including phase change, during their opening and closure operation, providing a reliable and complete experimental database that can be used for validation of unsteady two-phase flow numerical models. For this objective, the complex valve design is simplified, and several orifice sizes and geometries are proposed individually and simultaneously to characterize the unsteady cryogenic flow. Furthermore, initial temperature conditioning of the experimental setup ranging from cryogenic to ambient values will allow covering different flow regimes. In the first part of the paper, the background research and motivations are introduced. Secondly, the design of the experimental setup and expected operating conditions are described including the analysis of the proposed instrumentation: mass flow rate, pressure, temperature, and flow visualization. Each measurement technique is described and analysed. In the third part, a thermal-mechanical FEM study is presented to provide estimations of maximum deformations and mechanical stresses expected in the different test section materials during the experimental tests, therefore supporting the selection of the test section materials and manufacturing processes. Fourthly, a simplified 1D unsteady flow modelling tool that couples mass, momentum and energy equations is proposed to evaluate the flow characteristics for the future experiments. Preliminary results of the 1D model are presented to support this design of experiment.

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Benchmarking iSALE and CTH shock physics codes to in situ high-velocity impact experiments into Fe-Ni targets

Alexander¹,

Marchi²,

Chocron³

et al. 2021

Preprint

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Cryogenic Materials Data Handbook (Revised). Volume I. Sections A, B, C.

Cited by 6 publications

References 0 publications

Thermal diffusion and quench propagation in YBCO pancake coils wound with ZnO and Mylar insulations

Thermal diffusion and quench propagation in YBCO pancake coils wound with ZnO and Mylar insulations

Design and Analysis of a Cryogenic Unsteady Flow Experiment through a Propellant Assisted Valve

Benchmarking iSALE and CTH shock physics codes to in situ high-velocity impact experiments into Fe-Ni targets

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