Enhancement of Flow Boiling Heat Transfer in High Quality Region in a Vertical Tube

垂直管内优质区域流动沸腾传热的强化

• 批准号: 03650184
• 负责人: FUJITA Yasunobu
• 金额: $ 1.28万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650184/
• 关键词: Flow Boiling; Heat Transfer; Enhancement; Twisted Tape Insert; Critical Heat Flux; Post Dryout; Freon 113; R113; 管内流; テ-プインサ-ト

(1) An experimental study on flow boiling heat transfer is performed to attain heat transfer enhancement in a tube. Twisted tape-insert made of Teflon is adopted as the enhancement promoter. Test liquid is freon 113 and pressure at the inlet to the uniformly heated tube is 0.3 MPa. The range of mass velocity is 150 to 1500 kg/m^2s.(2) Heat transfer enhancement by the twisted tape-insert in a plain tube is observed, except for the nucleate boiling region and the two-phase convective boiling region.(3) The enhancement in the non-boiling region of the single phase of liquid increases with decreasing tape twist ratio. The enhancement ratio is 10% at a twist ratio of 10, and 12% at a twist ratio of 5.9.(4) Opposite effects, increase and decrease, on the critical quality at which tube wall temperature abruptly starts to rise are observed for the tape-insert.(5) The enhancement in the post dryout region also increase with decreasing tape twist ratio.

(1)为实现管内强化换热，进行了流动沸腾换热的实验研究。采用聚四氟乙烯缠绕胶带作为增强促进剂。试验液体为氟里昂113，均匀加热管入口压力为0.3兆帕。质量速度范围为150~1500 kg/m~2 s.(2)除了核沸腾区和两相对流沸腾区外，光管中的扭带插入物对换热有明显的强化作用.(3)单相液体的非沸腾区的强化程度随扭带扭率的减小而增大.在加捻比为10时，增强率为10%，在加捻比为5.9时，增强率为12%。(4)对管壁温度突然开始升高的临界质量有不同程度的增减效应。(5)后干燥区的增强率随加捻比的减小而增加。

项目成果

Y.Fujita,: "Enhancement of Flow Boiling Heat Transfer in Post Dryout Region" Proceedings of 2nd JSME-KSME Thermal Engineering Conference. 3. 289-294 (1992)

Y.Fujita，：“干燥后区域流动沸腾传热的增强”第二届 JSME-KSME 热工会议论文集。

Y.Fujita: "Enhancement of Flow Boiling Heat Transfer in Post Dryout Region" Proceedings of 2nd JSME-KSME Thermal Engineering Conference. 3. 289-294 (1992)

Y.Fujita：“干燥后区域流动沸腾传热的增强”第二届 JSME-KSME 热工会议论文集。

藤田 恭伸: "管内強制対流沸騰熱伝達の促進に関する研究(第1報)" 第29回日本伝熱シンポジユム講演論文集. (1992)

Yasunobu Fujita：“通过管道中的强制对流促进沸腾传热的研究（第一次报告）”第 29 届日本传热研讨会论文集（1992 年）。

Fujita Yasunobu: "Enhancement of Flow Boiling Heat Transfer in Post Dryout Region" Proceedings of 2nd JSME-KSME Thermal Engineering Conference. Vol.3. 289-294 (1992)

Fujita Yasunobu：“干燥后区域流动沸腾传热的增强”第二届 JSME-KSME 热工会议论文集。