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The architectural design of smart ventilation and drainage systems in termite nests.

ABSTRACT: Termite nests have been widely studied as effective examples for ventilation and thermoregulation. However, the mechanisms by which these properties are controlled by the microstructure of the outer walls remain unclear. Here, we combine multiscale X-ray imaging with three-dimensional flow field simulations to investigate the impact of the architectural design of nest walls on CO2 exchange, heat transport and water drainage. We show that termites build outer walls that contain both small and percolating large pores at the microscale. The network of larger microscale pores enhances permeability by one to two orders of magnitude compared to the smaller pores alone, and it increases CO2 diffusivity up to eight times. In addition, the pore network offers enhanced thermal insulation and allows quick drainage of rainwater, thereby restoring the ventilation and providing structural stability to the wet nest.

SUBMITTER: Singh K

PROVIDER: S-EPMC6430624 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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The architectural design of smart ventilation and drainage systems in termite nests.

Singh Kamaljit K Muljadi Bagus P BP Raeini Ali Q AQ Jost Christian C Vandeginste Veerle V Blunt Martin J MJ Theraulaz Guy G Degond Pierre P

Science advances 20190322 3

Termite nests have been widely studied as effective examples for ventilation and thermoregulation. However, the mechanisms by which these properties are controlled by the microstructure of the outer walls remain unclear. Here, we combine multiscale X-ray imaging with three-dimensional flow field simulations to investigate the impact of the architectural design of nest walls on CO<sub>2</sub> exchange, heat transport and water drainage. We show that termites build outer walls that contain both sm ...[more]

PMID: 30915392

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