Analytical and computational studies on the vacuum performance of a chevron ejector

Kong, Fan Shi; Jin, Yingzi; Kim, Heuy Dong

doi:10.1007/s00193-015-0618-8

Cited by 3 publications

(2 citation statements)

References 36 publications

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“…Both effects contribute to break up agglomerates within the aerosol. [ 39 ] The second advantage of the ejector is the possibility to independently control

\left(\overset{. }{V}\right)_{\text{flask}}

and

\left(\overset{.}{V}\right)_{\text{acc}}

.…”

Section: Process Development Toward Dry‐processed Perovskite Absorber...mentioning

confidence: 99%

First of Their Kind: Solar Cells with a Dry‐Processed Perovskite Absorber Layer via Powder Aerosol Deposition and Hot‐Pressing

et al. 2023

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Preparing halide perovskite films by solvent‐free, powder‐based processing approaches currently attracts more and more attention. However, working solar cells employing dry, powder‐based halide perovskite thin films, have not been demonstrated so far. Herein, perovskite solar cells are presented where the absorber layer is prepared by transferring readily synthesized perovskite powders into a compact thin film using a fully dry‐powder‐processing concept. Compact thin films are deposited via an optimized powder aerosol deposition (PAD) process. Pressing at 120 °C further improves the morphology and the optoelectronic film properties. Integrating the perovskite films in a solar cell configuration results in fully working devices, with champion power conversion efficiencies of >6%. While the (optoelectronic) properties of the PAD‐processed films are found to be comparable with their solution‐processed counterparts, investigations of the solar cell stack suggest deterioration of the electron‐transport layer properties due to the PAD process, and the presence of hydrates at the perovskite surface to be important factors that contribute to the limited solar cell efficiency. Herein, perspectives to overcome the identified limitations are outlined, emphasizing the high potential and realizability of efficient perovskite solar cells based on dry‐powder‐processing approaches in the future.

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“…Both effects contribute to break up agglomerates within the aerosol. [ 39 ] The second advantage of the ejector is the possibility to independently control

\left(\overset{. }{V}\right)_{\text{flask}}

and

\left(\overset{.}{V}\right)_{\text{acc}}

.…”

Section: Process Development Toward Dry‐processed Perovskite Absorber...mentioning

confidence: 99%

First of Their Kind: Solar Cells with a Dry‐Processed Perovskite Absorber Layer via Powder Aerosol Deposition and Hot‐Pressing

et al. 2023

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“…Although they worked basically on the motive flow profile they found that as the slope of the motive flow pressure profile increases, the suction increases BY 40%. Kong et al [13] studied analytical and with CFD the performance of vacuum of a chevron ejector and they found that with this kind of nozzle helps the secondary stream into the mixing chamber. Mazzelli et al [14] also performed a numerical and experimental analyses in order to check the effectiveness of the different turbulence models.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Supersonic Ejector for Vacuum Generation with Explicit and Implicit Solver in Openfoam

et al. 2019

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Supersonic ejectors are used extensively in all kind of applications: compression of refrigerants in cooling systems, pumping of volatile fluids or in vacuum generation. In vacuum generation, also known as zero-secondary flow, the ejector has a transient behaviour. In this paper, a numerical and experimental research of a supersonic compressible air nozzle is performed in order to investigate and to simulate its behaviour. The CFD toolbox OpenFOAM 6 was used, with two density-based solvers: explicit solver rhoCentralFoam, which implements Kurganov Central-upwind schemes, and implicit solver HiSA, which implements the AUSM+up upwind scheme. The behaviour of the transient evacuation ranges between adiabatic polytropic exponent at the beginning of the process and isothermal at the end. A model for the computation of the transient polytropic exponent is proposed. During the evacuation, two regimes are encountered in the second nozzle. In the supercritic regime, the secondary is choked and sonic flow is reached. In the subcritic regime, the secondary flow is subsonic. The final agreement is good with the two different solvers, although simulation tends to slightly overestimate flow rate for large values region.

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Analysis on the optimal mixing pressure and efficiency limit of an ideal ejector

2021

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Analytical and computational studies on the vacuum performance of a chevron ejector

Cited by 3 publications

References 36 publications

First of Their Kind: Solar Cells with a Dry‐Processed Perovskite Absorber Layer via Powder Aerosol Deposition and Hot‐Pressing

First of Their Kind: Solar Cells with a Dry‐Processed Perovskite Absorber Layer via Powder Aerosol Deposition and Hot‐Pressing

Numerical Simulation of a Supersonic Ejector for Vacuum Generation with Explicit and Implicit Solver in Openfoam

Analysis on the optimal mixing pressure and efficiency limit of an ideal ejector

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