Journal
APPLIED THERMAL ENGINEERING
Volume 186, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2020.116357
Keywords
Ejector; Joule-Thomson effect; Cryocooler; 3D printing; Turbulence modeling
Funding
- National Natural Science Foundation of China [52076115]
- Networking/Partnering Initiative of European Space Agency (ESA) [4000114493/15/NL/KML/fg]
Ask authors/readers for more resources
This paper presents a miniature ejector with a nozzle throat diameter of 162 micrometers, measured using X-ray computed tomography, and investigates its performance under different operating conditions, demonstrating its applicability in a Joule-Thomson cooling cycle.
The performance of Joule-Thomson (JT) cryocoolers can be improved by introducing ejectors. Ejectors with various geometric features have been proposed and investigated for cryogenic cooling in earlier studies, but only limited research is done on ejectors with a nozzle throat diameter less than 1 mm. In this paper, we present a miniature ejector with a nozzle throat diameter of 162 mu m that was measured using X-ray computed tomography. When the ejector was operated with nitrogen gas at 295 K with a primary inlet pressure of 80 bar, a secondary inlet pressure of 0.5 bar and an outlet pressure of 1.2 bar, the primary and the secondary mass-flow rates were 394 mg/s and 83 mg/s, respectively. The measured primary mass-flow rate was quite close to the value predicted by a dynamic model, whereas the measured secondary mass-flow rate was lower than the predicted value, which was mainly caused by a non-axisymmetric machining defect of the nozzle that was assumed to be axisymmetric in the dynamic model. Besides, the effects of operating pressures and nozzle position on the ejector performance were analyzed. The study demonstrates the applicability of a miniature ejector in a JT cooling cycle.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available