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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.2015010549
pages 511-518

HYDRODYNAMICS AND HEAT TRANSFER IN TUBES WITH SMOOTH AND RIBBED TWISTED TAPE INSERTS

Anatoly B. Yakovlev
Kazan National Research Technical University named after A. N. Tupolev−KAI, 10 Karl Marx str., Kazan 420111, Russia
Stanislav E. Tarasevich
Federal State Government-Funded Educational Institution of Higher Professional Education "Kazan National Research Technical University named after A. N. Tupolev" (KAI), 10 Karl Marx Str., Kazan, Republic of Tatarstan, 420111, Russia
Artur A. Giniyatullin
Kazan National Research Technical University named after A. N. Tupolev, 10 K. Marx Street, Kazan, 420111, Russia
Andrey V. Shishkin
Federal State Government-Funded Educational Institution of Higher Professional Education "Kazan National Research Technical University named after A. N. Tupolev" (KAI), 10 Karl Marx Str., Kazan, Republic of Tatarstan, 420111, Russia

ABSTRACT

The results of an experimental research of the structure of an adiabatic two-phase (air-water) flow in tubes with a twisted tape insert at p = 0.1−0.15 MPa are presented. The slug, wave, annular, disperse, and cord regimes have been revealed. The main feature of the structure in such channels is that a liquid-phase part (and all liquid at the high range of gas qualities) moves in the form of a stream (a cord) on the tape and does not contact an active heat transfer surface. The device for intensification of heat and mass transfer (especially at boiling) in the form of the twisted tape with ribs discretely installed on an angle to a tape axis is offered. The ribs on the tape promote displacement ofa liquid from the tape to a tube heat transfer surface. The results of an experimental research of a heat transfer and a hydraulic resistance in tubes with various tape twisting inserts also are presented. The possibility of an effective utilization of the twisted tapes with ribs for an intensification of a heat and mass transfer in tubes is shown.


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