Heat Transfer Enhancement in Tube using Modified Twisted Tape Inserts

Asmaa Ali Hussein

《Research Journal of Applied Sciences, Engineering and Technology》 13卷8期 (2016/10) Pp. 617-625

https://doi.org/10.19026/rjaset.13.3047

摘要

The aim of the present experimental investigations is to increase of turbulent flow heat transfer in a horizontal circular tube using six types of twisted tapes in which a total length relative to the diameter ratio is 24 and Reynolds number values runs from 4500 to 23500. Take twisted tapes amendment: (normal, regularly spaced, triangular-cut, rectangular-cut, semicircular-cut and drilled) twisted tape. In this study, the development of mutual relations between the Nusselt number, friction factor and enhance the efficiency of each type of inclusion twisted stripe have been taken into account. The results showed that the heat transfer process in tube with twisted ribbon provider drilled more efficient than other forms of twisted tape because the strong spiral flow along the tube length leads to more disturbance of the entire flow field.

關鍵字

Heat transfer ； tube ； twisted tape