Passive flow control in square duct and 90° elbow with circular turbulator at certain gaps

Randi Purnama Putra*, Sutardi, Wawan Aries Widodo, Rizkia Putra Pratama

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

The ducting system has considerable energy losses in a high building. Pressure drop in ducting caused by friction loss, separation loss, and secondary flow. The high-pressure drop leads to an increased amount of energy consumption required. The method identified in reducing this energy loss is by using passive flow control. This study aims to identify the characteristics of the fluid in the ducting with variations in the circular turbulator gap. The variation of the gap between circular turbulator and inner of 90° elbows (g/Dh) is 0.01 - 0.05. The ducting model used is a square duct with a hydraulic diameter of 125 mm. Ducting consists upstream duct of 7Dh, Circular turbulator (CT) with a diameter of 12.5 mm, elbow with a curvature ratio (Rc/Dh) of 1.5, and a downstream duct of 15Dh. Tests are carried out at Reynolds numbers (ReDh) 3.97 × 104, 8.74 × 104, and 13.5 × 104. The results showed that the addition of circular turbulator g/Dh = 0.02 reduced the overall pressure drop by 20.52 %. While g/Dh = 0.04 and 0.05 can increase pressure drop. The addition of CT can form a shear layer that has a higher turbulence intensity (TI) so that it can fight adverse pressure or delay flow separation due to the inner of 90° elbow. The use of CT with g/Dh = 0.02 can increase TI by 30.92 %. While the ducting without CT only produces turbulence intensity of 18.02%. The use of CT with g/Dh = 0.01, 0.03, 0.04 and 0.05 found a decrease in turbulence intensity of 13.17 %, 15.95 %, 15.89 % and 8.51 % respectively.

Original languageEnglish
Title of host publicationInnovative Science and Technology in Mechanical Engineering for Industry 4.0
Subtitle of host publicationProceedings of the 4th International Conference on Mechanical Engineering, ICOME 2019
EditorsVivien Djanali, Fahmi Mubarok, Bambang Pramujati, Suwarno
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735419346
DOIs
Publication statusPublished - 10 Dec 2019
Event4th International Conference on Mechanical Engineering: Innovative Science and Technology in Mechanical Engineering for Industry 4.0, ICOME 2019 - Yogyakarta, Indonesia
Duration: 28 Aug 201929 Aug 2019

Publication series

NameAIP Conference Proceedings
Volume2187
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference4th International Conference on Mechanical Engineering: Innovative Science and Technology in Mechanical Engineering for Industry 4.0, ICOME 2019
Country/TerritoryIndonesia
CityYogyakarta
Period28/08/1929/08/19

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