Pressure drop of slush nitrogen flow in converging–diverging pipes and corrugated pipes

A superconducting power cable is required to be cooled down and kept at a very low temperature, so it is important to reveal its thermal and cooling characteristics. We have analyzed the heat flow and temperature distribution of a single-core superconducting power cable for railway application. Temperature of the cable increases due to heat flow through the vacuum thermal insulation layer and the current leads. A superconducting cable core is displaced from the cable center axis by gravity and by thermal contraction at a curved section. These forces press the vacuum thermal insulation layer, which would influence its thermal insulation performance. Heat flow through the thermal insulation layer, etc. is evaluated, and FEM analysis is carried out to obtain the temperature distribution. The total heat invasion and the pressure drop are also estimated in the superconducting power cable. 

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“…Hawthorne and Von Helms reported a frictional factor formula for a corrugated pipe [7], which is given by…”

Section: E Pressure Dropmentioning

confidence: 99%

“…where p is the pitch of the corrugated pipe and γ is the experimentally determined coefficient (γ = 0.438 [7]). Fig.…”

Section: E Pressure Dropmentioning

confidence: 99%

Thermal and Cooling Characteristic Analysis of a Superconducting DC Power Cable for Railway Application

Ohsaki

Kumagai

Tomita

2015

IEEE Trans. Appl. Supercond.

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“…where ΔP, λ, ρ, and u are pressure drop, pipe friction factor, fluid density, and mean flow velocity, respectively. Hawthorne and Von Helms reported a frictional factor formula for a corrugated pipe, which is given by [11]…”

Section: 1mentioning

confidence: 99%

Feasibility study of superconducting power cables for DC electric railway feeding systems in view of thermal condition at short circuit accident

2016

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A superconducting power cable has merits of a high power transmission capacity, transmission losses reduction, a compactness, etc., therefore, we have been studying the feasibility of applying superconducting power cables to DC electric railway feeding systems.However, a superconducting power cable is required to be cooled down and kept at a very low temperature, so it is important to reveal its thermal and cooling characteristics. In this study, electric circuit analysis models of the system and thermal analysis models of superconducting cables were constructed and the system behaviors were simulated. We analyzed the heat generation by a short circuit accident and transient temperature distribution of the cable to estimate the value of temperature rise and the time required from the accident.From these results, we discussed a feasibility of superconducting cables for DC electric © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ railway feeding systems. The results showed that the short circuit accident had little impact on the thermal condition of a superconducting cable in the installed system.

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“…As a non-invasive flow sensing methods, particle image velocimetry (PIV) was widely adopted to investigate the flow field around Taylor bubble in ordinary liquid [3,22,29,27,15,16,25,26]. PIV technique has already been used for investigating the flow field of cryogenic fluid [17,18,13,14,31,8]. For example, Xu and Van Sciver [31] developed an experimental approach for applying the PIV technique to the measurements in He II forced flow.…”

Section: Introductionmentioning

confidence: 98%

Investigation of Taylor bubble wake structure in liquid nitrogen by PIV technique

Liu

Wang

et al. 2013

Cryogenics

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Pressure drop of slush nitrogen flow in converging–diverging pipes and corrugated pipes

Cited by 13 publications

References 21 publications

Thermal and Cooling Characteristic Analysis of a Superconducting DC Power Cable for Railway Application

Thermal and Cooling Characteristic Analysis of a Superconducting DC Power Cable for Railway Application

Feasibility study of superconducting power cables for DC electric railway feeding systems in view of thermal condition at short circuit accident

Investigation of Taylor bubble wake structure in liquid nitrogen by PIV technique

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