Conveners
C1Or4A - Thermophysical Properties and Transport Processes II
- Robert Duckworth
- Matthew Shenton
In this work we consider multi-mode, multi-scale heat transfer within a cryogenic storage system and demonstrate the importance of using gaseous conduction functions derived from low pressure gas theory in converging to published experimental data. Through validation of modeling data against experimental cryostat data available in the academic literature, we develop the framework for...
With the growing interest in utilizing liquid hydrogen to decarbonize the aviation and transportation industries, understanding the effective thermal conductivity of insulations utilized in vacuum-jacketed liquid hydrogen vessels is critical to predicting heat leak and boil-off characteristics. Moreover, the ability to predict the transient heat flux during a loss of vacuum event is a critical...
This paper explores the cooling demands of high-temperature superconducting microwave receiver front-ends, specifically aiming at microstrip antennas within a cryogenic subsystem. Firstly, a transient heat transfer model was developed based on experiments with a 3W@77K pulse tube cryocooler. Then, a cryogenic system with a 15W@77K cryocooler was designed from this model, achieving a cooling...
Density wave oscillations (DWO) are one of the most common instability types in flow boiling systems. In liquid hydrogen (LH2) pipe flow with heat ingress, DWO can cause large fluctuations of temperature, pressure, void fraction, and flow rate, which puts strain on the system and makes LH2 transfer processes unstable. Predicting the onset of these oscillations and the magnitudes is important...
Notable cost is invested in the liquification of cryogenic fluids such as liquid Nitrogen, Helium, Hydrogen, and Argon. End users have an interest in knowing the level of heat leak cryogenic systems experience, and convenient methods of heat leak calculations. End-users value pump designs that minimize heat leak in cryogenic systems to improve system efficiency and reduce operating costs. At...
