The design of cooling and dehumidification towers is important for many process industries. This paper reports the results of a theoretical and experimental investigation on the direct contact heat and mass transfer characteristics of water droplets in counter-current flow through a water vapour-air mixture which simulates the stream to be dehumidified. The range of temperatures and dew points studied was 250–410°F and 85–112°F respectively. The effect of parameters such as contact path length, water droplet to water vapour-air mass ratios, droplet diameter, and entrainment are studied. The experimental information is then utilized in the design of a dehumidification tower.
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