Abstract
Rayleigh-Taylor instability in a shock tube has been investigated experimentally. Such instability was produced by accelerating a liquid column down a vertical circular tube employing shock wave impact. The liquid column is a combination of decane and salt solution. Acceleration of about 26 times gravitational acceleration with decane depth of 150 mm and salt solution depth of 100 mm were studied. The resulting instability of the gas/liquid (air and decane) interface and the liquid/liquid (decane and salt water) interface was recorded and later analysed using high-speed video images. Cavity formation was observed in the middle of the gas/liquid interface soon after the shock wave impact; bubbles and spikes then developed across the rest of the interfacial plane. Measurements showed that the growth coefficient of the cavity is about twice of that of the bubbles. The growth coefficient of the bubbles is nearly independent of the Atwood number, while the growth coefficient of spikes is sensitive to the Atwood number.
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