Plant leaves possess small channels that connect the
Chapter , Problem 12.116(choose chapter or problem)
Plant leaves possess small channels that connect the interior moist region of the leaf to the environment. The channels, called stomata, pose the primary resistance to moisture transport through the entire plant, and the diameter of an individual stoma is sensitive to the level of CO2 in the atmosphere. Consider a leaf of corn (maize) whose top surface is exposed to solar irradiation of GS 600 W/m2 and an effective sky temperature of Tsky 0 C. The bottom side of the leaf is irradiated from the ground which is at a temperature of Tg 20 C. Both the top and bottom of the leaf are subjected to convective conditions characterized by h 35 W/m2 K, T 25 C and also experience evaporation through the stomata. Assuming the evaporative flux of water vapor is 50 106 kg/m2 s under rural atmospheric CO2 concentrations and is reduced to 5 106 kg/m2 s when ambient CO2 concentrations are doubled near an urban area, calculate the leaf temperature in the rural and urban locations. The heat of vaporization of water is hfg 2400 kJ/kg and assume 0.97 for radiation exchange with the sky and the ground, and S 0.76 for solar irradiation. 12.117 I
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