Experiments were performed to investigate the local development of roughness and its effect on mass transfer in an S-shaped bend at Reynolds number of 200,000. The tests were performed over four consecutive time periods using a 203-mm-diameter test section with a dissolving gypsum lining to water in a closed flow loop at a Schmidt number of 1200. The surface roughness and the mass transfer over the test periods were measured using X-ray computed tomography (CT) scans of the surface. Two regions of high mass transfer are found: along the intrados of the first and second bends. The surface roughness in these two regions, characterized by the height-to-spacing ratio, grows more rapidly than in the upstream pipe. There is an increase in the mass transfer with time, which corresponds well with the local increase in the height-to-spacing ratio of the roughness. The two regions of high mass transfer enhancement in the bend can be attributed to both a roughness effect and a flow effect due to the bend geometry. The geometry effect was determined by normalizing the local mass transfer with that in a straight pipe with equivalent surface roughness. The mass transfer enhancement due to the geometry effect was found to be relatively constant for the two high mass transfer regions, with a value of approximately 1.5.
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July 2018
Research-Article
Effects of Surface Roughness and Bend Geometry on Mass Transfer in an S-Shaped Back to Back Bend at Reynolds Number of 200,000
D. Wang
,
D. Wang
Department of Mechanical Engineering,
McMaster University,
Hamilton, ON L8S 4L7, Canada
McMaster University,
Hamilton, ON L8S 4L7, Canada
Search for other works by this author on:
D. Ewing
,
D. Ewing
Department of Mechanical Engineering,
McMaster University,
Hamilton, ON L8S 4L7, Canada
McMaster University,
Hamilton, ON L8S 4L7, Canada
Search for other works by this author on:
C. Y. Ching
C. Y. Ching
Department of Mechanical Engineering,
McMaster University,
Hamilton, ON L8S 4L7, Canada
e-mail: chingcy@mcmaster.ca
McMaster University,
Hamilton, ON L8S 4L7, Canada
e-mail: chingcy@mcmaster.ca
Search for other works by this author on:
D. Wang
Department of Mechanical Engineering,
McMaster University,
Hamilton, ON L8S 4L7, Canada
McMaster University,
Hamilton, ON L8S 4L7, Canada
D. Ewing
Department of Mechanical Engineering,
McMaster University,
Hamilton, ON L8S 4L7, Canada
McMaster University,
Hamilton, ON L8S 4L7, Canada
C. Y. Ching
Department of Mechanical Engineering,
McMaster University,
Hamilton, ON L8S 4L7, Canada
e-mail: chingcy@mcmaster.ca
McMaster University,
Hamilton, ON L8S 4L7, Canada
e-mail: chingcy@mcmaster.ca
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 30, 2017; final manuscript received November 21, 2017; published online March 30, 2018. Assoc. Editor: Yuwen Zhang.
1Corresponding author.
J. Heat Transfer. Jul 2018, 140(7): 073001 (8 pages)
Published Online: March 30, 2018
Article history
Received:
May 30, 2017
Revised:
November 21, 2017
Citation
Wang, D., Ewing, D., and Ching, C. Y. (March 30, 2018). "Effects of Surface Roughness and Bend Geometry on Mass Transfer in an S-Shaped Back to Back Bend at Reynolds Number of 200,000." ASME. J. Heat Transfer. July 2018; 140(7): 073001. https://doi.org/10.1115/1.4038844
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