狭い間隔で相対する冷却面間を通して湿り空気を通したときの熱伝達(第 1 報)

概要

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When the moist air flows through narrow-spaced, parallel and cooled surfaces, the air is not only cooled but also part of the moisture contained in it condenses on the surfaces. In order to clarify these phenomena and to obtain the values of surface coefficient of heat transfer between the air current and the cooled surface, the distribution of the air flow velocity and the changes in dry-and wet-bulb temperatures were investigated experimentally, and we have found that the former is similar to the latter as shown in figs. 8 and 9. From these temperature distributions we found that the variation of absolute humidity of the flow was small all over the section, but that the degree of humidity gradually diminished along the flow direction from the entrance to the exit. Since the condensation on the surfaces had a great effect on the heat transfer in this case, and since the surface coefficient of heat transfer could not be analyzed as a function of flow velocity, we attempted to find the relation between the heat transfer rate α and the absolute humidity, and we succeeded in getting the following equation α=4.6×10^4⊿x-16kcal/m^2h℃ for the range of air flow velocity in our experiment, and in this equation ⊿x means the difference between the absolute humidity at the inlet and the one at the outlet of the cooled surfaces.
湘南工科大学の論文
1970-03-31