• flow pattern assessment in tubes of reciprocating scraped surface heat exchangers

    کلمات کلیدی :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 538
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     flow pattern in the tubes of an innovative scraped surface heat exchanger with reciprocating scrapers has been experimentally investigated. the scraper consists of a concentric rod inserted in each tube of the heat exchanger, mounting an array of semicircular plugs that fit the inner tube wall. a hydraulic piston provides the scraper with constant-velocity reciprocating motion. phase-averaged velocity fields have been obtained with piv technique for both scraping semi-cycles, with special emphasis on the effect of the scraping velocity (velocity ratio) and reynolds number. visualization results have been contrasted with experimental data on fanning friction factor, obtaining a clear relation between flow patterns, pressure drop augmentation and turbulence promotion. cfd simulations for quasi-steady laminar flow provide a further insight into the relation of the flow structures with wall shear stress, and the contribution of pressure forces to global head losses, for each scraping semi-cycle.

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