Numerical investigation and estimation method of leakage behaviour for hydrogen-blended natural gas in overhead pipelinesTing Zhang, Guohua Xiong, Hongqiang Ma, Yue Zeng, Huilun Kang, Jing Wu and Xiaosong ChengSci. Tech. Energ. Transition, 80 (2025) 45DOI: https://doi.org/10.2516/stet/2025019