Transient heat transfer to a forced flow of supercritical helium at 4.2 K

Bloem, W. B.

doi:10.1016/0011-2275(86)90006-8

Cited by 40 publications

(9 citation statements)

References 11 publications

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“…This approximation is based on the analytical solution of the heat flux entering an ideally infinite boundary layer following a step in the strand temperature [9]. In reality, during the experiment the heat flux from the strand to the helium is a strong function of time, and thus the assumption of constant strand temperature used for the calculation of fails.…”

Section: Discussionmentioning

confidence: 99%

Transient stability analysis of the SeCRETS experiment in SULTAN

Marinucci¹,

Bottura

Bruzzone

2002

IEEE Trans. Appl. Supercond.

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Abstract-We present here the results of the analysis of the stability experiment SeCRETS, performed on two Nb 3 Sn cable-inconduit conductors with the same amount of total copper stabilizer, but different degree of segregation. The model used for the analysis, including superconducting strands, conductor jacket and helium, is solved with the code Gandalf™. We obtain a qualitative agreement of simulation results and experimental values. The simulation results confirm that in the operation regime explored in the experiment the segregated copper is not effective for stability. The details of the current sharing and the approximation taken for the transient heat transfer are shown to be critical for the interpretation.

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Section: Discussionmentioning

confidence: 99%

Transient stability analysis of the SeCRETS experiment in SULTAN

Marinucci¹,

Bottura

Bruzzone

2002

IEEE Trans. Appl. Supercond.

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“…These results indicate that the heat transfer coefficient is also virtually independent of pressure.Comparison data from [l] and[3] are also plotted inFig. 3.Although the heater geometry in each experiment is different, 2313 the reported heat transfer coefficients are all very similar.…”

mentioning

confidence: 83%

Stability of cable-in-conduit internally cooled superconductors subject to local disturbance

et al. 1994

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A b s t r a c t A likely source of a quench in cable-in-11. EX€"MENTALRESULTS conduit internally cooled superconductors (CCICS) is frictional beating due to strand motion in the A. A~~T V S~D PROCEDURE cable. Most previous studies on CCICS stability conductor by assuming that the disturbance energy apparahs. The test chamber contains pressurized stagnant is uniformly distributed across the cross section. helium and is cooled by immersion in the surrounding 4.2-K We believe that these studies are too optimistic, and have studied the stability of ccIcs assuming liquid helium bath. A 20 pm diameter platinum-OS%cobalt that the disturbance energy is abruptly input into a (Pt-CO) wire whose resistance is a known function of small part of a single strand. To perform this temperahre Serves both as the heater and an extremely fast analysis, the transient beat transfer characteristics response thermometer. Following Schmidt[4], the heater of supercritical helium (SHE) have been measured.

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“…A detailed description of the loop is given in ealier reports [3,4]. The test section was made of a rectangular OHFC copper tube, which also has been used in the Sultan 8 T inner coil [7].…”

Section: Test Sectionmentioning

confidence: 99%

“…The tube was heated on four sides. The heaters were made of manganin foil of 10 micrometer thickness and 2 mm width [4].…”

Section: Test Sectionmentioning

confidence: 99%

“…Sometimes support materials like stainless steel are included [2]. Transient heat transfer data to a forced flow of supercritical helium have been recently obtained by Bloem [3,4,23]. Cornelissen and Hoogendoorn [5, 6], developed parallel a numerical computer simulation model, which describes the thermal stability of superconductors cooled by a turbulent flow of supercritical helium.…”

Section: Introductionmentioning

confidence: 99%

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