Insights on the thermal impacts of wing colorization of migrating birds on their skin friction drag and the choice of their flight route
Insights on the thermal impacts of wing colorization of migrating birds on their skin friction drag and the choice of their flight route
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DOI：
10.1016/j.jtherbio.2018.01.011
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发表时间：
2018-02-01
影响因子：
2.7
通讯作者：
Abdelkefi, A.
中科院分区：
文献类型：
--
作者：
Hassanalian, M.;Ben Ayed, S.;Abdelkefi, A.
从飞行路线、迁徙时间、几何学特征和行为学特征等方面研究了四种鸟类翅膀颜色在飞行中的热效应。考虑到这些飞行路线的海洋和大气特征，在迁徙过程中对鸟类翅膀进行了热分析。为了确定机翼两侧的表面温度，在能量平衡中考虑了包括海洋通量和太阳辐照度在内的周围通量。应用Blasius解决方案加热边界层，它表明，这些候鸟的颜色配置，即黑色的翅膀和白色的翅膀的底部（“反阴影”），结果在皮肤阻力减少，如果与其他一些配置相比，当白天和黑夜都考虑在内。这种减阻作用可以被认为是这些迁徙鸟类长时间耐力的有效因素之一。这项研究可以提供这些迁徙鸟类颜色背后的进化观点。
The thermal effects of wing color in flight is investigated in four species of birds with respect to their flight routes, migration time, and geometric and behavioral characteristics. Considering the marine and atmospheric characteristics of these flight routes, a thermal analysis of the birds' wings is performed during their migration. The surrounding fluxes including the ocean flux and the solar irradiance are considered in an energy balance in order to determine the skin temperature of both sides of the wing. Applying the Blasius solution for heated boundary layers, it is shown that the color configuration of these migrating birds, namely black on the top side of the wings and white on the bottom side of the wings ("countershading"), results in a skin drag reduction, if compared to some other configurations, when both day and night are taken into consideration. This drag reduction can be considered as one of the effective factors for long endurance of these migrating birds. This research can provide the evolutionary perspective behind the colorization of these migrating birds.