- 著者
-
藤田 恭伸
アレクサンダー ロペス
- 出版者
- 一般社団法人日本機械学会
- 雑誌
- 日本機械学会論文集. B編 (ISSN:03875016)
- 巻号頁・発行日
- vol.61, no.588, pp.3044-3051, 1995-08-25
- 被引用文献数
-
3
Experimental data of liquid and vapor flows of R 113 for Re=5000〜400000 were obtained for both a plain tube and snugly fitted twisted tape insert tubes. No evidence of tape fin effects was found in the heat transfer characteristics of a stainless steel tape insert when compared to a Teflon tape insert. For twist ratios γ = 5.9, 10.0 and 16.0, improvements in heat transfer of up to 35% were observed. Based on a simple consideration of the heat transfer enhancement mechanisms of twisted tape inserts, a Dittus and Boelter-type correlation for a plain tube was modified to include twisted tape effects. For such a case, use of available plain-tube data was recommended to maximize the accuracy of the proposed correlation. The trade-off between pressure loss and heat transfer enhancement was considered before determining the overall desirability of twisted tape inserts.