Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns
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 unde...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Begell House Publishers
2015
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| Online Access: | http://hdl.handle.net/1721.1/96966 https://orcid.org/0000-0002-2901-0638 https://orcid.org/0000-0002-0606-713X |
| _version_ | 1826200428038062080 |
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| author | Tow, Emily W. Lienhard, John H |
| author2 | Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab |
| author_facet | Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab Tow, Emily W. Lienhard, John H |
| author_sort | Tow, Emily W. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T11:36:19Z |
| format | Article |
| id | mit-1721.1/96966 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:36:19Z |
| publishDate | 2015 |
| publisher | Begell House Publishers |
| record_format | dspace |
| spelling | mit-1721.1/969662023-02-17T02:05:35Z Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns Tow, Emily W. Lienhard, John H Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab Massachusetts Institute of Technology. Department of Mechanical Engineering Tow, Emily W. Tow, Emily W. Lienhard, John H. 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. Center for Clean Water and Clean Energy at MIT and KFUPM (Project R4-CW-08) Flowers Family Fellowship MIT Department of Physics Pappalardo Program (Fellowship) National Science Foundation (U.S.). Graduate Research Fellowship (Grant 1122374) 2015-05-12T18:05:14Z 2015-05-12T18:05:14Z 2014-08 Article http://purl.org/eprint/type/ConferencePaper 978-1-56700-421-2 http://hdl.handle.net/1721.1/96966 Tow, Emily W., and John H. Lienhard. “Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns.” 15th International Heat Transfer Conference (2014). https://orcid.org/0000-0002-2901-0638 https://orcid.org/0000-0002-0606-713X en_US http://dx.doi.org/10.1615/IHTC15.tbf.008857 Proceedings of the 15th International Heat Transfer Conference Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Begell House Publishers Tow |
| spellingShingle | Tow, Emily W. Lienhard, John H Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns |
| title | Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns |
| title_full | Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns |
| title_fullStr | Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns |
| title_full_unstemmed | Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns |
| title_short | Measurements of Heat Transfer Coefficients to Cylinders in Shallow Bubble Columns |
| title_sort | measurements of heat transfer coefficients to cylinders in shallow bubble columns |
| url | http://hdl.handle.net/1721.1/96966 https://orcid.org/0000-0002-2901-0638 https://orcid.org/0000-0002-0606-713X |
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