Effects of Discrete Rib-Turbulators on Heat/Mass Transfer Augmentation in a Rectangular Duct

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 24, Issue 5, 2000, pp.744-752
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.2000.24.5.744

Title & Authors

Effects of Discrete Rib-Turbulators on Heat/Mass Transfer Augmentation in a Rectangular Duct

Kwon, Hyuk-Jin; Wu, Seong-Je; Cho, Hyung-Hee;

Kwon, Hyuk-Jin; Wu, Seong-Je; Cho, Hyung-Hee;

Abstract

The influence of arrangement and length of discrete ribs on heat/mass transfer and friction loss is investigated. Mass transfer experiments are conducted to obtain the detailed local heat/mass transfer information on the ribbed wall. The aspect ratio (width/height) of the duct is 2.04 and the rib height is one tenth of the duct height, such that the ratio of the rib height to hydraulic diameter is 0.0743. The ratio of rib-to-rib distance to rib height is 10. The discrete ribs were made by dividing each continuous rib into 2, 3 or 5 pieces and attached periodically to the top and the bottom walls of the duct with a parallel orientation The combined effects of rib angle and length of the discrete ribs on heat/mass transfer ae considered for the rib angles . As the number of the discrete ribs increases, the uniformity of the heat/mass transfer distributions increases. For , the heat/mass transfer enhancement with the discrete ribs is remarkable, while the heat/mass transfer performances are slightly higher than that of the transverse continuous ribs due to the accompanied high friction loss penalty. For , the average heat/mass transfer coefficients and the heat/mass transfer performances decrease slightly with the discrete ribs compared to the case of the angled continuous ribs

Keywords

Rib Turbulator;Discrete Rib;Heat/Mass Transfer Augmentation;Thermal Performance;Duct Flow;

Language

Korean

Cited by

1.

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2.

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설비공학논문집, 2001. vol.13. 5, pp.341-347

3.

Friction Factor and Heat Transfer in Equilateral Triangular Ducts with Surface Roughness,;

Journal of Mechanical Science and Technology, 2001. vol.15. 5, pp.639-645

4.

정사각 덕트 내에서 열/물질전달 촉진을 위한 경사진 단락 요철의 좁은 틈새 효과,우성제;이세영;최청;조형희;

6.

왕복운동을 하는 사각채널에서 거칠기 배열이 열전달에 미치는 효과,안수환;손강필;진용수;김성태;

설비공학논문집, 2003. vol.15. 6, pp.502-509

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