Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures
Particulate fouling and particle deposition at elevated temperature are crucial issues in microchannel heat exchangers. In this work, a microfluidic system was designed to examine the hydrodynamic effects on the deposition of microparticles in a microchannel flow, which simulate particle deposits in...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/89252 http://hdl.handle.net/10220/47693 |
| _version_ | 1811676807459504128 |
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| author | Yang, Chun Yan, Zhibin Huang, Xiaoyang |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Yang, Chun Yan, Zhibin Huang, Xiaoyang |
| author_sort | Yang, Chun |
| collection | NTU |
| description | Particulate fouling and particle deposition at elevated temperature are crucial issues in microchannel heat exchangers. In this work, a microfluidic system was designed to examine the hydrodynamic effects on the deposition of microparticles in a microchannel flow, which simulate particle deposits in microscale heat exchangers. The deposition rates of microparticles were measured in two typical types of flow, a steady flow and a pulsatile flow. Under a given elevated solution temperature and electrolyte concentration of the particle dispersion in the tested flow rate range, the dimensionless particle deposition rate (Sherwood number) was found to decrease with the Reynolds number of the steady flow and reach a plateau for the Reynolds number beyond 0.091. Based on the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, a mass transport model was developed with considering temperature dependence of the particle deposition at elevated temperatures. The modeling results can reasonably capture our experimental observations. Moreover, the experimental results of the pulsatile flow revealed that the particle deposition rate in the microchannel can be mitigated by increasing the frequency of pulsation within a low-frequency region. Our findings are expected to provide a better understanding of thermally driven particulate fouling as well as to provide useful information for design and operation of microchannel heat exchangers. |
| first_indexed | 2024-10-01T02:27:20Z |
| format | Journal Article |
| id | ntu-10356/89252 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:27:20Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/892522020-03-07T13:19:28Z Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures Yang, Chun Yan, Zhibin Huang, Xiaoyang School of Mechanical and Aerospace Engineering Elevated Temperature Effect DRNTU::Engineering::Aeronautical engineering Particle Deposition Particulate fouling and particle deposition at elevated temperature are crucial issues in microchannel heat exchangers. In this work, a microfluidic system was designed to examine the hydrodynamic effects on the deposition of microparticles in a microchannel flow, which simulate particle deposits in microscale heat exchangers. The deposition rates of microparticles were measured in two typical types of flow, a steady flow and a pulsatile flow. Under a given elevated solution temperature and electrolyte concentration of the particle dispersion in the tested flow rate range, the dimensionless particle deposition rate (Sherwood number) was found to decrease with the Reynolds number of the steady flow and reach a plateau for the Reynolds number beyond 0.091. Based on the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, a mass transport model was developed with considering temperature dependence of the particle deposition at elevated temperatures. The modeling results can reasonably capture our experimental observations. Moreover, the experimental results of the pulsatile flow revealed that the particle deposition rate in the microchannel can be mitigated by increasing the frequency of pulsation within a low-frequency region. Our findings are expected to provide a better understanding of thermally driven particulate fouling as well as to provide useful information for design and operation of microchannel heat exchangers. 2019-02-18T05:02:21Z 2019-12-06T17:21:13Z 2019-02-18T05:02:21Z 2019-12-06T17:21:13Z 2018 Journal Article Yan, Z., Huang, X., & Yang, C. (2018). Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures. Journal of Heat Transfer, 140(1), 012402-. doi:10.1115/1.4037397 0022-1481 https://hdl.handle.net/10356/89252 http://hdl.handle.net/10220/47693 10.1115/1.4037397 en Journal of Heat Transfer © 2018 ASME. All rights reserved. |
| spellingShingle | Elevated Temperature Effect DRNTU::Engineering::Aeronautical engineering Particle Deposition Yang, Chun Yan, Zhibin Huang, Xiaoyang Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures |
| title | Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures |
| title_full | Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures |
| title_fullStr | Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures |
| title_full_unstemmed | Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures |
| title_short | Hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures |
| title_sort | hydrodynamic effects on particle deposition in microchannel flows at elevated temperatures |
| topic | Elevated Temperature Effect DRNTU::Engineering::Aeronautical engineering Particle Deposition |
| url | https://hdl.handle.net/10356/89252 http://hdl.handle.net/10220/47693 |
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