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.
An ultra-high s peed image dissecting camera pat Lern ed after an o rig in a l d es ign by Sultanoff has prod uced motion pictures of s hock waves having velocitips g reaLe r t han 7 cm / mi croseco nd. Th e Camera is readily adaptab le to either sLreak or frami ng photography. A disc ussion of the camera s.vstem des ign indicaLe~ t he modification s of the or ig in al design which allow for greater fl ex ibility of camera use. Several photographs of hi gh speed shock waves a rc used to demonstrate the vario us modes of camera operation. The very high framing rate (1 X lOs/second) a nd the easy adaptation from streak to fr am in g photography make this camera a particularly usefu l tool for research in the field of very fast shock waves.
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