627. According to Chilton-Colburn analogy for mass transfer, $${{\text{N}}_{{\text{St}}}}.{{\text{N}}_{{\text{Sc}}}}^{\frac{2}{3}}$$ is equal to
628. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
630. In a counter-current extractor, as the axial mixing increases, the extraction efficiency
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