Proceedings of the International Conference Recent Advances in Materials, Processes and Technology for Sustainability (RAMPTS 2025)

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Numerical Analysis of Geometrically Modified Ejector Refrigeration System

Authors
P. J. Manoj1, *, V. Lijo2, C. V. Sumesh Babu2
1Department of Mechanical Engineering, Govt Engineering College Palakkad, APJ Abdul Kalam Technological University, Thrissur, Kerala, India
2Department of Mechanical Engineering, Govt Engineering College Thrissur, APJ Abdul Kalam Technological University, Thrissur, Kerala, India
*Corresponding author. Email: 123manojpjose@gmail.com
Corresponding Author
P. J. Manoj
Available Online 25 December 2025.
DOI
10.2991/978-94-6463-922-3_13How to use a DOI?
Keywords
Ejector Refrigeration System; Entrainment Ratio; Secondary Bypass System; Fabri choking; supersonic ejector
Abstract

The present study reports the results of an investigation of a geometrically modified ejector refrigeration system. The primary focus is on improving the Entrainment Ratio (ER), which is defined as the ratio of the mass flow rate of secondary fluid to the mass flow rate of primary. It is observed that ER can be improved with the addition of a secondary bypass. The secondary bypass helps the ejector to overcome the Fabri choking effect during critical operation. The secondary bypass openings are further modified and performance is compared in this study. Bypass with different cross section areas, multiple bypass openings, bypass openings located at different positions, and different end configurations are analyzed and compared here. Numerical study indicates an improvement of up to 11.66% better performance compared with conventional ERS systems is possible with geometrically modified secondary bypass systems. In addition, mixing and entrainment is enhanced by the shifting of shocks in the constant-area section while secondary-flow choking. The relationship between secondary-fluid injection into the main flow and the resulting shock structures inside the mixing duct, and its effect on the entrainment of the ERS, is also numerically analyzed.

Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the International Conference Recent Advances in Materials, Processes and Technology for Sustainability (RAMPTS 2025)
Series
Atlantis Highlights in Material Sciences and Technology
Publication Date
25 December 2025
ISBN
978-94-6463-922-3
ISSN
2590-3217
DOI
10.2991/978-94-6463-922-3_13How to use a DOI?
Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - P. J. Manoj
AU  - V. Lijo
AU  - C. V. Sumesh Babu
PY  - 2025
DA  - 2025/12/25
TI  - Numerical Analysis of Geometrically Modified Ejector Refrigeration System
BT  - Proceedings of the International Conference Recent Advances in Materials, Processes and Technology for Sustainability (RAMPTS 2025)
PB  - Atlantis Press
SP  - 193
EP  - 207
SN  - 2590-3217
UR  - https://doi.org/10.2991/978-94-6463-922-3_13
DO  - 10.2991/978-94-6463-922-3_13
ID  - Manoj2025
ER  -