CFD-Based Simulation and Analysis of Hydrothermal Aspects in Solar Channel Heat Exchangers with Various Designed Vortex Generators

Salmi, Mohamed; YounesMenni,; Chamkha, Ali J.; HouariAmeur,; Maouedj, Rachid; Youcef, Ahmed

doi:10.32604/cmes.2020.012839

Computer Modeling in Engineering &Amp; Sciences

2021

DOI: 10.32604/cmes.2020.012839

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CFD-Based Simulation and Analysis of Hydrothermal Aspects in Solar Channel Heat Exchangers with Various Designed Vortex Generators

Mohamed Salmi¹,

YounesMenni YounesMenni²,

Ali J. Chamkha³

et al.

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“…Many scholars have carried out steady-state simulations, computational fluid dynamic (CFD) analyses, and experimental tests to investigate the performance of the ejector. Especially, CFD-based simulation and analysis can provide detailed information on the flow field [7]. Peng et al [8] built a three-dimensional CFD model to analyze the influence of the distance of the standoff from the nozzle outlet on the performance of a high-speed rotating water ejector.…”

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Optimization Analysis of the Mixing Chamber and Diffuser of Ejector Based on Fano Flow Model

Zheng¹,

Wang²,

Zhang³

et al. 2022

Computer Modeling in Engineering &Amp; Sciences

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An improved model to calculate the length of the mixing chamber of the ejector was proposed on the basis of the Fano flow model, and a method to optimize the structures of the mixing chamber and diffuser of the ejector was put forward. The accuracy of the model was verified by comparing the theoretical results calculated using the model to experimental data reported in literature. Variations in the length of the mixing chamber L m and length of the diffuser L d with respect to variations in the outlet temperature of the ejector T c , outlet pressure of the ejector p c , and the expansion ratio of the pressure of the primary flow to that of the secondary flow p g /p e were investigated. Moreover, variations in L m and L d with respect to variations in the ratio of the diameter of the throat of the motive nozzle to the diameter of the mixing chamber d g0 /d c3 and ratio of the outlet diameter of the diffuser to the diameter of the mixing chamber d c /d c3 were investigated. The distribution of flow fields in the ejector was simulated. Increasing L m and d c3 reduced T c and p c . Moreover, reducing p g /p e or d g0 /d c3 reduced T c and p c . The length of the mixed section L m2 , which was determined on the basis of the Fano flow model, increased as p g increased and decreased as d c3 increased. The mixing length L m1 , which was considered the primary flow expansion, showed the opposite trend with that of L m2 . Moreover, L d increased as p g /p e and d c /d c3 increased. When the value of d c was 1.8 to 2.0 times as high as that of d c3 , the semi-cone angle of the diffuser ranged between 6°and 12°. At a constant d c /d c3 , decreasing T c and p c increased L d . KEYWORDSMixing chamber; length; Fano flow; diffuser; diameter ratio; expansion ratio; optimization method Nomenclature A cross-sectional area (m 2 ) c p specific heat at a constant pressure (kJ/kg•K) D diameter (m) f coefficient of friction k adiabatic index L length (m)

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mentioning

confidence: 99%

Optimization Analysis of the Mixing Chamber and Diffuser of Ejector Based on Fano Flow Model

Zheng¹,

Wang²,

Zhang³

et al. 2022

Computer Modeling in Engineering &Amp; Sciences

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CFD-Based Simulation and Analysis of Hydrothermal Aspects in Solar Channel Heat Exchangers with Various Designed Vortex Generators

Cited by 1 publication

References 0 publications

Optimization Analysis of the Mixing Chamber and Diffuser of Ejector Based on Fano Flow Model

Optimization Analysis of the Mixing Chamber and Diffuser of Ejector Based on Fano Flow Model

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