A bionic approach for heat generation and latent heat storage inspired by the polar bear

August, Anastasia; Kneer, Aron; Reiter, Andreas; Wirtz, Michael; Sarsour, Jamal; Stegmaier, Thomas; Barbe, Stéphan; Gresser, Götz T.; Nestler, Britta

doi:10.1016/j.energy.2018.11.143

Cited by 19 publications

(11 citation statements)

References 10 publications

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“…The hollow porous structure of polar bear hair endows it with unique optical property and allows a large quantity of still air inside, which could effectively reduce heat loss and block the low temperature in polar region 10 . Engineering scientists never stop mimicking the special structure found in polar bear hair and making bionic hollow fibers 11 . A typical example is multi‐channel aerogel fiber.…”

Section: Introductionmentioning

confidence: 99%

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Large‐scalable polar bear hair‐like cellular hollow fibers with excellent thermal insulation and ductility

Wang

Chi

Liu

et al. 2022

J of Applied Polymer Sci

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Passive warm‐keeping textiles could reduce carbon emissions by turning down indoor heating in winter. Polar bear hair exhibits a unique structure composed of a hollow core and an aligned porous shell, which extremely helps to resist heat transport. Great interest has arisen in the development of thermo‐insulating textiles with this biomimetic structure. In this work, cellular hollow fibers were made by a large‐scalable wet spinning‐foaming process. This efficient method achieved rapid formation of polar bear hair‐like fiber as well as facile turning properties of the fibers. The structure and properties of biomimetic fibers depended on the content of foaming agent. As‐prepared porous thermoplastic polyurethane (TPU)/polyacrylonitrile (PAN) composited fiber showed excellent ductility. The maximum tensile strength and breaking elongation was 4.31 MPa and 121%, respectively. The corresponding woven textile exhibited excellent thermal insulation properties even under deformation by compression or tension. The temperature difference across the thickness of textile was 17.9 and 34.9°C under a background temperature of 0 and 80°C, respectively. It may pave the way to fabricate new structure–function integrated fiber materials for warm‐keeping textiles.

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Section: Introductionmentioning

confidence: 99%

“…10 Engineering scientists never stop mimicking the special structure found in polar bear hair and making bionic hollow fibers. 11 A typical example is multi-channel aerogel fiber. Cui et al 12 fabricated multi-channel silk fibroin aerogel fiber via freezedrying spinning jet.…”

Section: Introductionmentioning

confidence: 99%

Large‐scalable polar bear hair‐like cellular hollow fibers with excellent thermal insulation and ductility

Wang

Chi

Liu

et al. 2022

J of Applied Polymer Sci

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“…From bionic approaches to the validation of new theories in particle physics, the new challenges of climate change mitigation, sustainability, and science currently strongly trigger innovation and creativity in thermal engineering , . In this regard, refrigeration using flow boiling carbon dioxide (CO 2 or R744 according to the ASHRAE Standard Designation) in small‐diameter tube channels is a well‐established technique for the cooling of particle detectors used in high‐energy physics.…”

Section: Introductionmentioning

confidence: 99%

One‐Piece Stainless‐Steel 3D Printed Minichannel Evaporators using Flow Boiling Carbon Dioxide

Kneer

Wirtz²,

Bozkurt

et al. 2020

Chem Eng & Technol

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New concepts are required for high-performance minichannel evaporators with low mass and reduced size involved in the cooling of cylindrical or conical surfaces. The development of one-piece stainless-steel evaporators using flow boiling CO 2 for the cooling of conical copper test specimens heated by a foil heater element is presented. The specimens mimic a mobile cooling device used in highenergy and particle physics. The stainless-steel evaporators were manufactured with a state-of-the-art 3D stainless-steel printer via selective laser melting. The computer-aided design and the construction of this new type of evaporators are described. A dedicated two-phase accumulator controlled loop filled with liquid CO 2 was developed, it allowed for operating four parallel connected evaporators. Cooling efficiency and manufacture reproducibility were experimentally investigated by applying different thermal loads and refrigerant mass flows.

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“…22,23 For example, the polar bear has black skin underneath the white hair to efficiently absorb sunlight for maintaining body temperature. 22 In the deep sea, some fish species have evolved ultrablack skins with close-packed melanosomes to enhance the light absorption, extremely lower reflectance, and camouflage themselves for near-stealth behavior. 23 The evolution of close-packed melanosome layers has inspired the design of synthetic ultrablack materials with a rational combination of superhydrophobic and photothermal features.…”

mentioning

confidence: 99%

“…In nature, there are diverse examples of black surfaces that can be used to maintain temperature, hunt, or camouflage. , For example, the polar bear has black skin underneath the white hair to efficiently absorb sunlight for maintaining body temperature . In the deep sea, some fish species have evolved ultrablack skins with close-packed melanosomes to enhance the light absorption, extremely lower reflectance, and camouflage themselves for near-stealth behavior …”

mentioning

confidence: 99%

Engineering Biomimetic Nanostructured “Melanosome” Textiles for Advanced Solar-to-Thermal Devices

et al. 2022

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In nature, deep-sea fish featured with close-packed melanosomes can remarkably lower light reflection, which have inspired us to design ultrablack coatings for enhanced solar-to-thermal conversion. Herein, a biomimetic ultrablack textile is developed enabled by the formation of hierarchical polypyrrole (Ppy) nanospheres. The fabricated textile exhibits prominently suppressed reflectance of lower than 4% and highly enhanced absorption of up to 96%. Further experimental results and molecular dynamics (MD) simulation evidence the formation process of hierarchical nanospheres. Based on high-efficient solar-to-thermal conversion, the biomimetic textile with desirable conductivity allows the development of a salt-free solar evaporator, enabling a sustainable seawater evaporation rate of up to 1.54 kg m–2 h–1 under 1 sun. Furthermore, the biomimetic hierarchical textile exhibits good superhydrophobicity, enhanced photothermal property, and high electrothermal conversion, demonstrating significant potential in wearable thermal management (rescue vests) in water conditions.

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A bionic approach for heat generation and latent heat storage inspired by the polar bear

Cited by 19 publications

References 10 publications

Large‐scalable polar bear hair‐like cellular hollow fibers with excellent thermal insulation and ductility

Large‐scalable polar bear hair‐like cellular hollow fibers with excellent thermal insulation and ductility

One‐Piece Stainless‐Steel 3D Printed Minichannel Evaporators using Flow Boiling Carbon Dioxide

Engineering Biomimetic Nanostructured “Melanosome” Textiles for Advanced Solar-to-Thermal Devices

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