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Research Papers

Triple-Choking Model for Ejector

[+] Author and Article Information
J. Sargolzaei1

Department of Chemical Engineering, Ferdowsi University of Mashhad, P.O. Box 9177948944, Mashhad, Iransargolzaei@um.ac.ir

M. R. Pirzadi Jahromi

Department of Chemical Engineering, Ferdowsi University of Mashhad, P.O. Box 9177948944, Mashhad, Iranmr_pj_7@yahoo.com

E. Saljoughi

Department of Chemical Engineering, Ferdowsi University of Mashhad, P.O. Box 9177948944, Mashhad, Iransaljoughi@gmail.com

1

Corresponding author.

J. Thermal Sci. Eng. Appl 2(2), 021009 (Nov 08, 2010) (10 pages) doi:10.1115/1.4002752 History: Received May 03, 2010; Revised October 03, 2010; Published November 08, 2010; Online November 08, 2010

In this study, a 1D analysis has been presented for the prediction of ejector performance at critical mode operation. The new triple-choking model has been developed using the governing equations of the compressible fluids and thermodynamics properties based on the frictional adiabatic fluid study. A new approach has been introduced to consider the frictional effects on the mixing efficiencies by extending the 1D ejector theory. A very good agreement has been reported for the R141b and steam experimental data at critical mode operation. Furthermore, simulated results have been compared with some of the recent theoretical models. In addition, the influence of operation conditions on the ejector performance and the required cross-sectional area of the mixing chamber has been showed. Finally, the influence of the operation conditions (such as generator, condenser, and evaporator temperatures) and the size of ejector on the mixing efficiency have been studied.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Conventional ejector refrigeration system

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Figure 2

Schematic diagram and flow characteristic in the ejector

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Figure 3

Hypothetical duct extension at the end of the constant-area mixing chamber

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Figure 4

Simulation flow chart for the ejector performance analysis

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Figure 5

Comparing models and calculated relative errors for prediction of area ratio

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Figure 6

Comparing models and calculated relative errors for prediction of entrainment ratio

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Figure 7

Variation of area ratio with critical condenser temperature

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Figure 8

Variation of critical entrainment ratio with critical condenser temperature

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Figure 9

Comparing triple-choking model and experimental data for entrainment ratio

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Figure 10

Variation of operating condition versus fmix for ejector with nozzle AG=7.73

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Figure 11

Variation of operating condition versus fmix for ejector with nozzle AD=9.41

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