Slush Hydrogen Flow Characteristics and Solid Fraction Upgrading

Hydrogen is an alternative fuel that is currently being used in fuel cell (FC) applications. This study focuses on electric-assisted bicycles (electric bicycles) powered by FCs and aims to determine the configuration of an FC system based on power demand. Metal hydrides (MHs) were used in the investigation to facilitate the containment of FC systems with improved hydrogen storage capacity. The flow performance was evaluated in our previous study; thus, here we focused on understanding the hydrogen flow characteristics from storage and the weight gain of the cartridge. Through experiments performed on existing electric-assisted bicycles, the relationship between the load weight and the power demand was evaluated. Furthermore, the power capacity of Li-ion batteries and FC systems was compared. No loss in performance was observed up to an additional payload weight of 8 kg. Combining the FC unit with an auxiliary battery offers up to 6.81× benefits with a significant weight capacity (8 kg). It is inferred that the current MH tank design does not support the required amount of hydrogen. The hydrogen flow could be supported by the exhaust heat of the FC to the MH.

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Effect of solid fraction on the mechanical properties of thixomolded magnesium alloys

Journal of Mining and Metallurgy Section B Metallurgy ◽

10.2298/jmmb0801101g ◽

2008 ◽

Vol 44 (1) ◽

pp. 101-106 ◽

Cited By ~ 1

Author(s):

V. Goryany ◽

P.J. Mauk

Keyword(s):

Mechanical Properties ◽

Magnesium Alloys ◽

Solid Fraction ◽

Solid Phase ◽

Flow Characteristics ◽

Temperature Profiles ◽

Pouring Temperature ◽

Solid Matter

The higher the fraction of solid phase in the partly solidified melt during pouring, the poorer the mechanical properties of thixocast components. The solid fraction decreases as the pouring temperature rises. Recommended temperature profiles for the pouring cylinder are shown. The flow characteristics of the partly solidified melt hardly changes as the content of solid matter increases.

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The hydrogen flow characteristics of the multistage hydrogen Knudsen compressor based on the thermal transpiration effect

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2019.04.155 ◽

2019 ◽

Vol 44 (40) ◽

pp. 22632-22642 ◽

Cited By ~ 2

Author(s):

Jianjun Ye ◽

Junda Shao ◽

Junlong Xie ◽

Zhenhua Zhao ◽

Jiangcun Yu ◽

...

Keyword(s):

Flow Characteristics ◽

Hydrogen Flow ◽

Thermal Transpiration

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Experimental Investigation on Flow Characteristics of Hydrogen in Pipelines

Volume 1: Codes and Standards ◽

10.1115/pvp2009-77577 ◽

2009 ◽

Author(s):

Jinyang Zheng ◽

Honggang Chen ◽

Ping Xu ◽

Yongzhi Zhao ◽

Lifang Zhang ◽

...

Keyword(s):

Experimental Investigation ◽

Flow Characteristics ◽

Experimental Tests ◽

Technical Problems ◽

Hydrogen Flow ◽

Pressure Pipeline ◽

Hydrogen Supply ◽

High Pressure Pipeline ◽

Different Characteristics ◽

Supply Systems

The design of high pressure pipeline is one of key technical problems facing the realization of hydrogen refueling stations and fuel cell automobiles. Currently, hydrogen velocity restrictions in pipeline are considered in reference to natural gas, which leads to some difficulties in design of pipelines for hydrogen supply systems. Considering the different characteristics of hydrogen, this paper establishes an analytical model and carries out a series of experimental tests to investigate the flow characteristics of hydrogen in pipelines. The effects of the pressure in the pipeline on the hydrogen flow velocity and mass flow are studied, and the corresponding relationships are also obtained. The results may provide references for the design of hydrogen pipelines and the development of standards in hydrogen refueling stations and hydrogen supply systems.

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