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  • 1
    Publikationsdatum: 2013-12-22
    Beschreibung: Based on the FVM (Finite Volume Method), standard turbulent model used to close the RANS (Reynolds Average Navier- Stokes Equations) equations and scalable wall function, was adopted to treat the flow near wall, and the flow pattern in the bell mouth of a certain axial-flow pump was simulated. The results show that there were some vortexes and spiral flows in the bell mouth if we used a traditional bell mouth which was also used in mixed-flow pump. By optimizing the structure of the bell mouth, the simulated results showed that the flow pattern in the bell mouth was better than a traditional bell mouth, there were no vortexes or spiral flows in the bell mouth, and the performance of the pump was also better than before. Based on the numerical simulation, the new structure of the bell mouth was proposed to be used practical engineering.
    Print ISSN: 1757-8981
    Digitale ISSN: 1757-899X
    Thema: Maschinenbau
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2018-08-31
    Beschreibung: To determine the quality difference in different varieties of leaf lettuces, we investigated the characteristics of 74 varieties of leaf lettuces (55 green and 19 purple varieties). Both domestic and foreign varieties of lettuce were included in this study. We determined six nutritional indicators of these varieties: such as total soluble sugar, starch, cellulose, proteins, and vitamin C. The grey correlation analysis was used to analyze the 74 varieties of leaf lettuces. Thus, the merits of these traits were compared. The results indicate that the purple leaf lettuce P-S23 had grey comprehensive evaluation value of about 0.8, which was the highest among all varieties. For green leaf lettuces G-S68 and G-S10, grey comprehensive evaluation values were less than 0.5. This indicates that nutritional quality and nutritional value of the purple leaf varieties were higher than that of the green leaf varieties. Furthermore, the quality of green varieties of G-S68 and G-S10 were of poor...
    Print ISSN: 1755-1307
    Digitale ISSN: 1755-1315
    Thema: Geographie , Geologie und Paläontologie , Physik
    Standort Signatur Erwartet Verfügbarkeit
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