Reduced-gravity experiments were performed on combustion of droplets composed of n-heptane mixed with methanol or ethanol.\r\nThe initial alcohol mass fraction in a droplet was 0% (pure heptane) or 5%. The experiments were performed at 0.1MPa and 25�°C\r\nwith air or with ambients of oxygen and helium with oxygen mole fractions of 0.3 or 0.4. Initial droplet diameters were in the\r\nrange 0.67mmto 0.92 mm. After consideringmeasurement uncertainties, burning rates decreased appreciably as the initial droplet\r\ndiameter increased for combustion in air but not for combustion in the oxygen/heliumenvironments. It was also found that addition\r\nof either methanol or ethanol did not influence burning rates appreciably and that burning rates were larger for the oxygen/helium\r\nenvironments than for air if initial droplet diameter dependences were accounted for.
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