Abstract
This study concerns experiments and analyses of the condensate flow and heat transfer in a dryer with a scraper in the case where the condensate film is thin. In the analysis using a model, the film thickness diverges at relatively slow rotations. A criterion for the critical condition on which the divergence commences is proposed. The analysis of the heat transfer is possible with a simpler model termed the solid film model, unless the divergence occurs. The experiments of the heat transmission are conducted with an acrylic resin cylinder and a stainless steel cylinder, and the flow patterns are observed. The experimental results on heat transmission agrees with the analytical one if about a 25 μm thick condensate film remains in spite of scraping.
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