CONVECTION PHENOMENA FROM PLANTS IN STILL AIR

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Abstract
Gates, D. M. (Boulder Labs. Natl. Bur. Stnds. and Inst. Arc. and Alp. Res., Univ. Colo Boulder, Colo.), and C. M. Benedict (Boulder Labs. Natl. Bur. Stnds., Boulder, Colo.) Convection phenomena from plants in still air. Amer. Jour. Bot. 50(6): 563–573. Illus. 1963.—The free convection from leaves in still air was observed by means of schlieren photographs of broad–leaved and coniferous trees. A quantitative measure of the rate at which energy was convected away from the leaf was obtained by photographing the size of the convection plume, measuring its rate of flow by means of movie photography, and measuring the temperature of the plume with a fine thermocouple. The heat load on a leaf and the surface temperature of the leaf were obtained with a total hemispherical radiometer and an infrared radiometer respectively. The observations of free convection from broad‐leaved plants confirmed the values predicted using heat transfer theory for heated plates. The observations with the branches of coniferous trees gave values which were not readily available from heat transfer theory. The schlieren system can also be used to observe forced convection from plants in wind.