Session: 08-06-01 non-presentations

Paper Number: 124574

124574 - Flow and Thermophysical Properties of Corrugated Cryogenic Hose for Offshore Lng Transfer 

Corrugated cryogenic hoses are increasingly favored for offshore LNG transfer between FLNG and LNG ships due to their flexibility. However, its flow and heat transfer characteristics remain to be properly understood. Despite extensive studies on the flow friction and convective heat transfer properties of the corrugated heat exchangers, few counterparts regarding corrugated cryogenic hose, which features much larger diameter can be found in the literature. The higher turbulence level caused by the larger diameter and evaporation due to heat ingression could potentially lead to different flow and thermal behaviors than the heat exchangers. In this paper, turbulent flow dynamics and thermal properties of large-diameter C-type corrugated hose with varying wave height to wavelength ratios are assessed. Global friction factor and Nusselt number under both free convection (single liquid phase) and nucleate boiling regime (two-phase flow) are obtained by experimentally validated Reynolds Stress Model coupled with Volume of Fluid method. The results suggest an increasing friction factor with respect to higher wave height to wavelength ratio due to the enhanced turbulent level. This relationship is more linear in the free convection regime than in the nucleation boiling regime, which is found to have larger friction factor due to the bubble-wall interaction. On the other hand, Nusselt number does not monotonically increase with larger wave height to wavelength ratio. A peak is reached and start to decrease as the ratio becomes higher. This holds true for both free convection and nucleate boiling situation. In spite of larger Nusselt number in the nucleate boiling regime, the peak point is delayed, meaning larger wave height to wavelength ratio is required for maximum heat transfer coefficient. Overall, the study reveals the correlation between corrugation shape and both the friction factor and Nusselt number, offering valuable insights for optimizing cryogenic hose design to enhance transport efficiency and thermal insulation.

Presenting Author: Zhaokuan Lu Ningbo Institute of Dalian University of Technology

Presenting Author Biography: Dr. Lu is a research scientist from Dalian University of Technology (Ningbo Institute). He graduated from Virginia Polytechnic Institute and State University with a degree in Aerospace and Ocean Engineering. He is specialized in CFD and heat transfer analysis of the turbulent multiphase flow in cryogenic hoses and other cryogenic equipments.

Authors:

Miaoer Liu CNOOC Gas & Power Group Co., Ltd.
Fangqiu Li CNOOC Gas & Power Group Co., Ltd.
Hao Cheng CNOOC Gas & Power Group Co., Ltd.
Xinxin Li CNOOC Gas & Power Group Co., Ltd.
Zhaokuan Lu Ningbo Institute of Dalian University of Technology