Library Subscription: Guest

ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

Sloshing induced heat and mass transfer in LN2 tank

Get access (open in a dialog) DOI: 10.1615/IHMTC-2021.2660
pages 1767-1772


This paper presents an experimental investigation of pressure and temperature evolution during the active pressurization of a partially filled liquid nitrogen (LN2) tank of 300mm diameter with nitrogen gas on top and the subsequent sloshing of the liquid nitrogen. The double-layer stainless steel container equipped with necessary instrumentations (thermocouples, pressure sensors) is used as a test tank which is capable of conducting test upto 4bar mounted on a table oscillating laterally. Partially filled LN2 tank is pressurized with gaseous nitrogen followed by hold phase and sloshing. During the hold phase transfer across the interface is dominated by molecular diffusion. Sloshing experiments, which are started at the end of the hold phase, show a large variation in pressure drop with the frequency. At small-amplitude forcing in a stable planar regime (away from the natural frequency), the pressure drop is about 10-35 kPa in one minute. At the swirl regime (near the natural frequency), the pressure drop can be more than 100 kPa in one minute. Experiments have shown a significant increase in wave amplitude when a transition from planar to swirl occurs. When hot vapor comes in contact with the cold wall during the swirl, a large condensation occurs on the wall. This gives rise to a substantial pressure drop in the container. The temperature along the central axis has been recorded with more emphasis near the interface to resolve the temperature gradient. The study showed that sloshing in chaotic mode gives maximum pressure drop whereas in stable planar wave sloshing pressure drop is slightly higher than molecular diffusion.