Thermal Cycle Testing of Titanium Superhydrophobic Surfaces for a Spacecraft Jumping Droplet Thermal Diode

Supowit, Jacob; Baker, Christopher H.; Zhao, Bailey Z.; McHale, John P.; Miller, Ryan; Pichardo, Patricia; Zuhlke, Craig; Roth, Nicholas; Tsubaki, Alfred; Ghaleni, Mahdi Mohammadi; Nejati, Siamak; Alexander, Dennis R.

doi:10.2514/6.2018-2946

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…Recent thermal diode efforts have focused on enhancing 𝜂, reducing costs, and improving the reliability upon cycling to accelerate the translation of thermal diodes from lab-scale studies to applications. [6][7][8][9][10][11][12] These thermal diodes have the potential to improve passive thermal control capabilities for scenarios with time-varying thermal conditions. [1,2] For example, in thermal energy storage systems, thermal diodes would enable strong thermal coupling to an intermittent energy source during charging periods, while providing strong thermal insulation to prevent heat leakage during storage periods.…”

Section: Introductionmentioning

confidence: 99%

Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

Shimokusu,

Nathani,

Liu

et al. 2024

Adv Materials Inter

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Jumping droplet thermal diodes (JDTDs) are promising candidates to achieve thermal rectification for next‐generation thermal control. However, most prior demonstrations of JDTDs have relied on monolayer‐coated copper‐based superhydrophobic (SHPB) surfaces, while lower‐cost aluminum JDTDs with more durable thin polymeric coatings have not been explored. In this work, a JDTD is constructed that employs SHPB aluminum surfaces coated with protective thin films of Teflon AF (amorphous fluoropolymer) 1601. Measurements for different heating orientations, gap heights (H), and fill ratios (ϕ) show that a maximum thermal rectification ratio of 7 can be achieved for H = 2.4 mm and ϕ = 10%. A thermal circuit is demonstrated that uses the JDTD to rectify time‐periodic temperature profiles, achieving thermal circuit effectiveness values up to 30% of the ideal‐diode limit. Coupon‐level durability tests and device‐level cycling show that dip coated Teflon AF enables stable operation of Al JDTDs over >20 cycles, improving on the performance of a monolayer‐coated surface that fails after 5 cycles. The findings of this work signify that Teflon AF coated Al SHPB surfaces can be used for thermal rectification and motivate future research into Al JDTDs for advanced thermal management applications.

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Section: Introductionmentioning

confidence: 99%

Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

Shimokusu,

Nathani,

Liu

et al. 2024

Adv Materials Inter

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show abstract

“…Recently, short and ultrashort pulsed laser processing techniques have demonstrated material adaptability for the fabrication of metallic anti-frosting surfaces. In particular, SHSs based on copper [ 23 ], titanium [ 24 ], aluminum alloys [ 25 ], and stainless steel [ 26 , 27 ] have been prepared, and their anti-frosting performance has been demonstrated. However, the condensate self-removal capability of such surfaces is yet to be analyzed in detail, and guidelines for parameter control for the fabrication of rationally structured SHSs via laser processing are yet to be established.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Metallic Superhydrophobic Surfaces with Tunable Condensate Self-Removal Capability and Excellent Anti-Frosting Performance

Zhao

Dai

et al. 2022

Nanomaterials

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Laser fabrication of metallic superhydrophobic surfaces (SHSs) for anti-frosting has recently attracted considerable attention. Effective anti-frosting SHSs require the efficient removal of condensed microdroplets through self-propelled droplet jumping, which is strongly influenced by the surface morphology. However, detailed analyses of the condensate self-removal capability of laser-structured surfaces are limited, and guidelines for laser processing parameter control for fabricating rationally structured SHSs for anti-frosting have not yet been established. Herein, a series of nanostructured copper-zinc alloy SHSs are facilely constructed through ultrafast laser processing. The surface morphology can be properly tuned by adjusting the laser processing parameters. The relationship between the surface morphologies and condensate self-removal capability is investigated, and a guideline for laser processing parameterization for fabricating optimal anti-frosting SHSs is established. After 120 min of the frosting test, the optimized surface exhibits less than 70% frost coverage because the remarkably enhanced condensate self-removal capability reduces the water accumulation amount and frost propagation speed (<1 μm/s). Additionally, the material adaptability of the proposed technique is validated by extending this methodology to other metals and metal alloys. This study provides valuable and instructive insights into the design and optimization of metallic anti-frosting SHSs by ultrafast laser processing.

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Seeding the growth of femtosecond laser produced microstructures on copper with multi-layered materials

Tsubaki,

Anderson,

Shield

et al. 2024

Applied Surface Science

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Thermal Cycle Testing of Titanium Superhydrophobic Surfaces for a Spacecraft Jumping Droplet Thermal Diode

Cited by 4 publications

References 16 publications

Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

Fabrication of Metallic Superhydrophobic Surfaces with Tunable Condensate Self-Removal Capability and Excellent Anti-Frosting Performance

Seeding the growth of femtosecond laser produced microstructures on copper with multi-layered materials

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