Liquid nitrogen flow in helically corrugated pipes with insertion of high-temperature superconducting power transmission cables. (September 2019)

• Record Type: Journal Article
• Authors: Zuo, Z.Q.; Jiang, W.B.; Yu, Z.G.; Huang, Y.H.
• Is Part Of: International journal of heat and mass transfer. Volume 140(2019)
• Page Start: 88
• Page End: 99
• Publication Date: 2019-09
• Subjects: Cable insertion -- Helically corrugated pipe -- Liquid nitrogen -- Flow loss -- Heat transfer; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2019.05.078
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: How the inserted cables affect the LN2 flow in the corrugated pipes is revealed. Cooling effect of the HTS cable(s) highly depends on cable configuration. Heat transfer correlations are proposed for HTS insert in liquid nitrogen corrugated pipes. Abstract: The pressure drop behavior of cryogenic flow in corrugated pipes is a critical design parameter for high-temperature superconducting (HTS) power transmission line systems. Most studies on the pressure loss and temperature increase of liquid nitrogen (LN2 ) flow in annularly corrugated pipes in the literature have focused on pipe geometries. However, the positioning and configuration of the HTS cables in the corrugated shell tube are also of great concern in practical applications. Moreover, helically corrugated pipes are used more frequently than annular pipes for the long-distance deployment of HTS transmission lines. This study investigates the influence of cable insertion and configuration in helically corrugated pipes on the surrounding subcooled LN2 flow, in terms of the pressure loss and temperature profiles. Triple and quadruple cables with diameters of 5 and 8 mm configured in different forms in a Φ 40 mm helically corrugated pipe are comparatively studied using a three-dimensional model. Correlations among the equivalent diameter, Nusselt number, and Reynolds number are proposed for predicting the heat transfer of LN2 flow in helically corrugated pipes.