沸騰熱伝達に及ぼす管群の効果について : 第1報,基礎実験の結果

概要

論文の詳細を見る
For tube bundle of flooded evaporators, boiling heat transfer coefficients are improved by upward streaming vapor bubbes. The authors tried to clarify the relation between boiling heat transfer characteristics of single tubes and those of tube bundles. In this report, boiling heat transfer characteristics of low-finned-tubes are investigated, using bundles of 4 horizontal tubes in a vertical row with side walls. Experimental results are summarized as follows: (1) when the clearance between tube and side wall is larger than 5 [mm], the effects of side walls on boiling heat transfer of tube bundles cannot be recognized; (2) bundle effects are affected both by the heat flux of the tube itself and by the total heat flux of the lower tubes; (3) the heat flux increase by upward streaming vapor bubbles has maximum value at wall superheat 5 [K] for 15~90 [kW/m^2] of total heat flux of the lower tubes.
一般社団法人日本機械学会の論文
1986-09-25