The Influence of Partial Pressure Difference and Supersaturation on the Frost Formation during the Cooling of Gas-Vapor-Mixtures in Counterflow Heat Exchangers
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Publisher SummaryThis chapter describes the influence of partial pressure difference and supersaturation on the frost formation during the cooling of gas–vapor-mixtures in counter flow heat exchangers. The chapter also outlines that temperature, flow rate and the partial pressure of benzene in the entering mixture were held constant during each experiment, as well as the flow rate and the temperature of the entering cooling air. All experiments were performed with Re-numbers between 1100 and 110,000. These Re numbers were related to the condition of the mixture entering the frost free tube. It has been observed in the report that at laminar flow formation of fog and snow in the center of the stream was observed during many experiments. The annular space between the snow and the tube wall contains no condensed benzene. It has been found as a final result of the experiments, that quantity and density of the frost on the wall depends considerably on the difference between the partial pressure of benzene in the mixture and the saturation pressure at the wall or at the surface of the frost.

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