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Investigating the Water and Methanol Condensation Heat Transfer Performance of Chemically Functionalized Silica Nanospring Coated Aluminum Tubes

Chamberlin, Joseph Paul
http://orcid.org/0000-0002-1868-387X
http://rave.ohiolink.edu/etdc/view?acc_num=miami162690676666569

Abstract Details

2021, Master of Science, Miami University, Mechanical and Manufacturing Engineering.
In this work, the heat transfer performance of silica nanospring coated aluminum tubes during water and methanol condensation experiments is investigated. Sets of coated tubes were created with varying nanospring growth times, and each set of coated tubes was chemically functionalized with a fluorinated silane compound. Both liquid immersion and vapor coating chemical functionalization techniques were employed. Heat transfer performance of each tube set was quantified by performing condensation experiments inside an environmental vacuum chamber under saturated conditions. Saturation temperatures for these experiments were set at 21 °C, 18 °C, 15 °C, 13 °C, and 12 °C for water condensation and at 21 °C, 18 °C, 13 °C, and 10 °C for methanol condensation. Experimental conditions were varied for water condensation testing for nominal subcooling degrees of 1 °C, 3 °C, 5 °C, 7 °C and 9 °C and cooling water flow rates from 1.5 LPM to 4 LPM in increments of 0.5 LPM. For methanol condensation testing, experimental conditions were varied for nominal subcooling degrees of 1 °C, 2 °C, 3 °C, and 4 °C and cooling water flow rates from 1.5 LPM to 3.5 LPM in increments of 0.5 LPM. It was found that for water condensation at 1 °C subcooling, tube sets coated with the 2.5 minute nanospring growth times and chemically functionalized via either liquid immersion or vapor coating outperformed the baseline tube set on average by 43.1% and 45.6%, respectively. Additionally, it was found that the lowest nanospring growth times (i.e., thinner coatings) outperformed higher growth times (i.e., thicker coatings), and that the highest heat transfer enhancements were realized at the lowest degree of subcooling. While none of the current nanospring-coated and chemically functionalized tube sets showed heat transfer enhancement for methanol condensation as compared to baseline tubes, future optimization of the coating is planned which could lead to improved results for low surface tension fluids.
Andrew Sommers (Advisor)
Giancarlo Corti (Advisor)
Edgar Caraballo (Committee Member)
Mark Sidebottom (Committee Member)
Mechanical Engineering

Recommended Citations

Citations

  • Chamberlin, J. P. (2021). Investigating the Water and Methanol Condensation Heat Transfer Performance of Chemically Functionalized Silica Nanospring Coated Aluminum Tubes [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami162690676666569

    APA Style (7th edition)

  • Chamberlin, Joseph. Investigating the Water and Methanol Condensation Heat Transfer Performance of Chemically Functionalized Silica Nanospring Coated Aluminum Tubes. 2021. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami162690676666569.

    MLA Style (8th edition)

  • Chamberlin, Joseph. "Investigating the Water and Methanol Condensation Heat Transfer Performance of Chemically Functionalized Silica Nanospring Coated Aluminum Tubes." Master's thesis, Miami University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami162690676666569

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Miami University and OhioLINK.