Current status of transport properties of hydrogen

This article contains a survey of experimental data for the thermal conductivity and viscosity of hydrogen, which are needed for many applications in system analysis and design. It includes an analysis of the current standard models for thermal conductivity and viscosity of normal hydrogen and parahydrogen, which are based on measurement and correlation work done before the mid1980s. Properties calculated with these models are analyzed and compared to all available experimental data for normal hydrogen and parahydrogen. Finally, recommendations for future work, including new experimental measurements to enable the development of improved transport property formulations for hydrogen, are provided.