Abstract
The objective of this investigation was to study the drag coefficient of free-falling drops of petroleumbased diesel and two biofuels; Canola Methyl Ester (CME) and soy methyl ester (SME). The drops were suspended on a thermocouple and underwent free fall of 24 cm in the test section. The air temperature in the test section was controlled by ceramic flat plate heaters on the side walls. The images of the drops were obtained using a digital high-speed video camera at a frame rate of 1000 per second. Two drop sizes (nominal diameters of 2 mm and 1 mm) were studied. The coordinates of the drop center were used to obtain the drop velocity and acceleration. The drag coefficient and the drop Reynolds number were computed based on these measurements. It was found that the drop acceleration significantly affected the drag coefficient. The measured drag coefficients were higher than those corresponding to solid spheres, during the initial descent of the drops. The drag coefficients of the drops of all three fuels illustrated a similar behavior.
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