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Schmiesing Thesis Final.pdf (5.63 MB)

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Characterizing the Condensation Heat Transfer Performance of Uniform and Patterned Silica Nanospring-Coated Tubes

Schmiesing, Nickolas Charles
http://orcid.org/0000-0002-9993-2232
http://rave.ohiolink.edu/etdc/view?acc_num=miami1557767797969861

Abstract Details

2019, Master of Science, Miami University, Mechanical and Manufacturing Engineering.
In this work, the condensation heat transfer performance of silica nanospring-coated horizontal aluminum tubes is assessed. Coated samples with varying nanospring mat thicknesses, dependent on growth time, were evaluated against a baseline aluminum sample. Condensation heat transfer testing with water was performed in an evacuated environmentally controlled chamber at flowrates ranging from 1.5 to 5.5 LPM and subcooling temperatures of 1.5, 5.5, and 9.5℃ (Tsat ≈ 20℃). During this testing, the nanospring-coated samples exhibited similar condensation heat transfer coefficients to the baseline sample and the SN15 sample (15-min. growth) increased the heat transferred to the cooling fluid by 60% as compared to the baseline. A patterned sample with alternating hydrophobic and hydrophilic rings was created with 15 minutes of growth, which offered similar heat transfer performance to the SN15 sample. Video analysis determined that the SN15 and SN20 (20-min. growth) experienced an 84% increase in the condensate removal rate over the baseline, while the patterned sample experiences a 96% increase. SEM imaging revealed that the coating withstood the condensation environment. Additional work needs to be performed to further evaluate the coating, but these findings suggest that the coating may be capable of improving condensation heat transfer performance.
Andrew Sommers, Dr. (Advisor)
Giancarlo Corti, Dr. (Advisor)
Carter Hamilton, Dr. (Committee Member)
Edgar Caraballo, Dr. (Committee Member)
96 p.
Mechanical Engineering
Silica nanosprings; condensation heat transfer; heat exchanger; nanotechnology; superhydrophobic; horizontal tubes; surface coating;

Recommended Citations

Citations

  • Schmiesing, N. C. (2019). Characterizing the Condensation Heat Transfer Performance of Uniform and Patterned Silica Nanospring-Coated Tubes [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1557767797969861

    APA Style (7th edition)

  • Schmiesing, Nickolas. Characterizing the Condensation Heat Transfer Performance of Uniform and Patterned Silica Nanospring-Coated Tubes. 2019. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1557767797969861.

    MLA Style (8th edition)

  • Schmiesing, Nickolas. "Characterizing the Condensation Heat Transfer Performance of Uniform and Patterned Silica Nanospring-Coated Tubes." Master's thesis, Miami University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1557767797969861

    Chicago Manual of Style (17th edition)

miami1557767797969861
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© 2019, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.