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Multiphase modeling of powder flow in an ejector of solar-driven refrigeration system by eulerian-lagrangian approach

Biglarian, M ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1002/9781119791232.ch13
  3. Publisher: wiley , 2023
  4. Abstract:
  5. The ejectors are the type of vacuum or pressure-based pump widely applicable in power engineering, thermal systems, and new solar-driven refrigeration systems. Streams inside the ejectors are complex, and it is not easy to describe the best possible flows and design by considering different hydrothermal properties. Nowadays, nanofluids are considered as a method for increasing the heat transfer rate in heat pipes, heat exchangers, and different parts of solar-driven systems which these progress reported and categorized in literature. In this study, the design parameters and optimization of an ejector for a solar-based refrigeration system, for generation vacuum, and consequently, maximum entrainment factor have been studied. Based on this study's aims, different diffuser angles, lengths, and geometrical factors in improving the performance parameters such as the entrainment factor have been investigated. The multiphase CFD model by use of the Eulerian-Lagrangian approach has been used for the simulation of the fluid-nanoparticles suction and mixing in this system. In geometries with constant diffuser angle and throat length (constant L and α) and different distances between the first inlet and throat (X), the maximum vacuum power was observed in 1 ≤ X/D ≤ 3. For the cases with various diffuser angles (other geometrical parameters were constant), the maximum entrainment values were observed in 5 ≤ α ≤ 15. The behavior of the microparticles that have been injected from the secondary inlet under the influence of drag force has been studied and the particle path lines have been presented in different cases. © 2023 John Wiley & Sons Ltd. All rights reserved
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  8. Source: Nanotechnology Applications for Solar Energy Systems ; 2023 , Pages 313-336 ; 978-111979123-2 (ISBN); 978-111979114-0 (ISBN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/9781119791232.ch13