Boundary Layer Resistance and Temperature Distribution on Still and Flapping Leaves: II. Field Experiments.

Area of Science:

• Plant physiology
• Biophysics
• Environmental science

Background:

• Understanding convective heat transfer from plant leaves is crucial for plant survival and ecosystem function.
• Forced convection plays a significant role in regulating leaf temperature, especially in windy environments.

Purpose of the Study:

• To investigate the forced convection of heat from Phragmites communis leaves in their natural habitat.
• To quantify the effect of natural wind turbulence on leaf boundary layer resistance and heat transfer.

Main Methods:

• Utilized liquid crystals painted onto Phragmites communis leaves to visualize leaf surface temperature without disrupting airflow.
• Observed heat transfer dynamics in the natural environment under varying wind conditions.

Main Results:

• Observed significant temperature differences (up to 15°C) between the leading and trailing edges of non-transpiring leaves.
• Demonstrated that turbulent natural wind reduced boundary layer resistance to approximately 40% compared to laminar flow.

Conclusions:

• Turbulent airflow in natural environments substantially enhances convective heat dissipation from Phragmites communis leaves.
• Leaf temperature is significantly influenced by wind-induced convective heat transfer, with implications for plant thermoregulation.