Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns
Name
Final_IHTC15-8857_Tow.pdf
Size
1.43 MB
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Adobe PDF
Checksum (MD5)
685bdf180dda521df7b38d37557cc8a1
Author(s)
Tow, Emily W.
Lienhard, John H
Date Issued
August 2014
Journal
Proceedings of the 15th International Heat Transfer Conference
Publisher
Begell House Publishers
Citation
Tow, Emily W., and John H. Lienhard. “Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns.” 15th International Heat Transfer Conference (2014).
Version
Author's final manuscript
Abstract
High heat transfer coefficients and large interfacial areas make bubble columns ideal for dehumidification. However, the effect of geometry on the heat transfer coefficients outside cooling coils in shallow bubble columns, such as those used in multi-stage bubble column dehumidifiers, is poorly understood. The generally-overlooked entry and coalescing regions become important in shallow bubble columns, and there is disagreement on the effects of the coil and column diameters. In this paper, a method is presented for measuring the heat transfer coefficient between coil and liquid in a shallow bubble column. Horizontal cylindrical probes are used to measure the heat transfer coefficient over a range of gas velocities. The liquid depth and the diameter, height, and horizontal position of the cylinder are also varied. Existing correlations for tall columns tend to underpredict the heat transfer coefficient and do not account for all effects of geometry. The highest heat transfer coefficients (above 8000 W/m[superscript 2]−K) are recorded on cylinders placed 4 cm high. No significant effect of cylinder diameter is observed. Based on the results, recommendations are made regarding bubble column dehumidifier design.
MIT Department
Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1615/IHTC15.tbf.008857
