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Showing papers in "Journal of the Indian Institute of Science in 1983"


Journal Article
TL;DR: In this paper, a two-dimensional subsonic jet was subjected to small periodic oscillations in its potential core region by vibrating a thin symmetric airfoil, and significant increase in the width of the jet and entrainment was observed due to excitation.
Abstract: A two-dimensional subsonic jet was subjected to small periodic oscillations in its potential core region by vibrating a thin symmetric airfoil. Significant increase in the width of the jet and entrainment was observed due to excitation. The effect of the amplitude as well as the frequency of vibration on the jet was investigated. The mean velocity profiles of the excited jet exhibited similarity.

3 citations


Journal Article
TL;DR: In this paper, a new reagent contg. $FeCl_3$ and $NH_4$ molybdate was used to detect protocatechuic acid and homoprotocatechic acid on Whatman no. 1 filter paper.
Abstract: Protocatechuic acid (I), homoprotocatechuic acid (II), and protocatechuic aldehyde (III) were sepd. by paper chromatog. on Whatman no. 1 filter paper and then detected with a new reagent contg. $FeCl_3$ and $NH_4$ molybdate. Six solvent systems were tested, and the best results were obtained with 2% $HCOOH$. On the chromatograms, I and III gave bluish green spots, and II gave a dark brown spot. This new $FeCl_3-NH_4$ molybdate reagent was also used successfully for detn. of I by photometry. The absorbance was linearly related to 10-100 \mug

1 citations