The effect of curvature ratio on the evaporative cooling of air flow through bent duct
Joint Authors
Abd al-Fathil, Sadiq G.
Muhammad, Abd al-Sattar Jawad
Source
Issue
Vol. 11, Issue 1 (31 Jan. 2020), pp.52-64, 13 p.
Publisher
University of Kufa Faculty of Engineering
Publication Date
2020-01-31
Country of Publication
Iraq
No. of Pages
13
Main Subjects
Topics
Abstract EN
This study investigates the effect of curvature ratio on the liquid-gas mixing in an air humidification process by choosing the optimum positioning of nozzles matrix fixed prior to a bent duct.
The present study is considered as a simulation of the gas turbine compressor inlet air cooling by the fogging technique.
The experiments were conducted using a wind tunnel with an average air velocity of (5 m /s) through a 50 cm square cross sectional duct.
The study employs three curvature ratios of 0.25, 0.5 and 0.75.
Also three nozzles tilt angles were tested at – 45°, 0° and 45° with respect to the axial air flow direction.
The design and the configuration of the nozzles matrix is decided according to the flow structure extracted from numerical simulation using CFD analysis with RNG-k-ε turbulent model.
The results indicate that a curvature ratio of 0.75 gives the best performance of the humidification system when the nozzles matrix installed as far as possible prior to the bent duct giving enough residence time for the injected droplets to evaporate.
At nozzles tilt angle of 0°, the relative humidity increased about 53.63% and the corresponding reduction in air temperature was 17 % .
Therefore, the optimum position of the nozzles has been shown in this study is at 1.5 m prior to the curve and a tilt angle of 0° when using the largest curvature ratio of 0.75 due to the shrink in the separation zone accompany the weakening of centrifugal forces.
This effect would widen the mixing area for the two streams to react and producing better cooling and humidification of the air.
American Psychological Association (APA)
Muhammad, Abd al-Sattar Jawad& Abd al-Fathil, Sadiq G.. 2020. The effect of curvature ratio on the evaporative cooling of air flow through bent duct. Kufa Journal of Engineering،Vol. 11, no. 1, pp.52-64.
https://search.emarefa.net/detail/BIM-975367
Modern Language Association (MLA)
Muhammad, Abd al-Sattar Jawad& Abd al-Fathil, Sadiq G.. The effect of curvature ratio on the evaporative cooling of air flow through bent duct. Kufa Journal of Engineering Vol. 11, no. 1 (Jan. 2020), pp.52-64.
https://search.emarefa.net/detail/BIM-975367
American Medical Association (AMA)
Muhammad, Abd al-Sattar Jawad& Abd al-Fathil, Sadiq G.. The effect of curvature ratio on the evaporative cooling of air flow through bent duct. Kufa Journal of Engineering. 2020. Vol. 11, no. 1, pp.52-64.
https://search.emarefa.net/detail/BIM-975367
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 63-64
Record ID
BIM-975367