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USING PATTERNED SURFACE WETTABILITY TO ENHANCE AIR-SIDE HEAT TRANSFER THROUGH FROZEN WATER DROPLET VORTEX GENERATORS

Koopman, Andrew Ernest
http://orcid.org/0000-0002-8612-4148
http://rave.ohiolink.edu/etdc/view?acc_num=miami1578672613073125

Abstract Details

2020, Master of Science, Miami University, Mechanical and Manufacturing Engineering.
In this study, air-side heat transfer enhancement via the introduction of hemispherical vortex generators (VGs) within a fin-and-tube heat exchanger was examined. A new technique for the deployment of hemispherical VGs utilizing the naturally-occurring condensation within the heat exchanger was employed. By using patterned surface wettability to collect condensate and encourage coalescence in predetermined locations, it was found that large frozen droplets can be formed in various configurations which can serve as VGs to enhance air-side heat transfer at airflow rates typical to domestic refrigeration (i.e. 1.0 to 2.0 m/s). These findings were then simulated numerically within ANSYS Fluent. Ten different configurations of VGs in channel flow were investigated using a fin spacing (5 FPI) typical to domestic refrigerator evaporators. Airflow of 1.0 to 2.0 m/s at 20°C was used for the flow through the channel where the walls and VGs were set to -9°C and the air-side heat transfer coefficient (h), pressure drop, and temperature changes were measured. Compared to a baseline configuration without VGs, h enhancements ranging from 14.0 – 75.9% were measured, with corresponding pressure drops ranging from 35.7 – 165.6%. The air-side temperature change within the test section ranged from 9.0 – 13.5°C between the inlet and outlet.
Andrew Sommers (Advisor)
Ryan Clark (Committee Member)
Edgar Caraballo (Committee Member)
Carter Hamilton (Committee Member)
126 p.
Mechanical Engineering
hemispherical vortex generator; dimple; dome; surface wettability; frost; microchannels; heat exchanger; heat transfer enhancement; CFD; condensate; air-side heat transfer; coalescence; evaporators

Recommended Citations

Citations

  • Koopman, A. E. (2020). USING PATTERNED SURFACE WETTABILITY TO ENHANCE AIR-SIDE HEAT TRANSFER THROUGH FROZEN WATER DROPLET VORTEX GENERATORS [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1578672613073125

    APA Style (7th edition)

  • Koopman, Andrew. USING PATTERNED SURFACE WETTABILITY TO ENHANCE AIR-SIDE HEAT TRANSFER THROUGH FROZEN WATER DROPLET VORTEX GENERATORS. 2020. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1578672613073125.

    MLA Style (8th edition)

  • Koopman, Andrew. "USING PATTERNED SURFACE WETTABILITY TO ENHANCE AIR-SIDE HEAT TRANSFER THROUGH FROZEN WATER DROPLET VORTEX GENERATORS." Master's thesis, Miami University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1578672613073125

    Chicago Manual of Style (17th edition)

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