Analysis on Comprehensive Heat Transfer Characteristics andDevelopment of the Spiral Grid Twisted Tape
[1]WU Jinxing,PENG Xu,LI Junchao.Analysis on Comprehensive Heat Transfer Characteristics andDevelopment of the Spiral Grid Twisted Tape[J].Journal of Zhengzhou University (Engineering Science),2014,35(06):10-13.[doi:10.3969/j.issn.1671-6833.2014.06.003]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
35
Number of periods:
2014 06
Page number:
10-13
Column:
Public date:
2014-11-25
- Title:
- Analysis on Comprehensive Heat Transfer Characteristics andDevelopment of the Spiral Grid Twisted Tape
- Keywords:
- gas-fired vaeuum boiler; tube insert; spiral grid twisted tape; heat transfer enhaneement; numerical simulation
- CLC:
- TQ051.5 TK124
- Abstract:
- In order to enhanee conveclive heat transler of the heat transfer tubes with bigger diameter, a newkind of tube insert, spiral grid twisted tape, was developed for the gas-fired vacuum boiler. 3D geometricmodels of the spiral grid twisted tape and the classie twisted tape with the same twist ratio inserted the tubeswere sel up repeelively. The comprehensive heat transfer charaeteristies in the tube was simulated using theFlUEN’T sofware under the same conditions. The mechanisms of heat transfer enhancement, such as deereasement of hydraulie diameler of flow section, inereasement of spiral flow speed, the secondary llow causedeentrifugal foree ete. are analyzed. The results show that the conveetive heat transfer coefficient of the spiragrid twisted tape deereases 8.6% than that of the classic twisted tapes and pressure drop decreases 32.0%.and comprehensive evaluation factor J is greater than 1. lt shows that the spiral grid twisted tape has a goodcomprehensive heat transter perermance.
- References:
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