Abstract
The distributions of local void fraction and heat-transfer coefficient of an air-water two-phase flow in helical coils were measured, and the effects of coil diameter and set angle on the heat-transfer characteristics were investigated. When the coil axis is horizontally placed, it is found that, at a high gas-phase velocity which forms the annular flow, there are still fairly large differences in the void fraction and the local heat-transfer coefficient between the upper and lower positions on the coil. It is shown that the average heat-transfer coefficients can be divided into three regions by Martinelli's parameter, 1/Xtt, for coils of any diameter. Among these regions, the effects of the set angle are significant at the second and third region. Finally, correlations between the average heat-transfer coefficient and 1/Xtt are proposed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
