Abstract
The fully developed turbulent Fanning friction factors and Nusselt numbers for purely viscous power-law non-Newtonian fluids in helical coils were measured experimentally. The flow passage is about 600 hydraulic diameters long. The test section wall was heated by passing direct electric current through it, yielding constant peripheral wall temperature and constant heat flux per unit length along the flow direction. For turbulent power-law fluid flows through helical coils, over the range of the coil-to-tube diameter ratio from 10 to 26, the generalized Reynolds number (Re *) from 25,000 to 50,000, the Prandtl number from 6 to 14, and the power-law exponent ( n) from 0.78 to 1, improved correlations for friction factor-prediction and a new correlation for Nusselt number are proposed. Other than space saving, helical coils do not offer any advantages over a straight tube for heat-exchanger applications involving turbulent flow of Newtonian or power-law non-Newtonian fluids.
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 callDisclaimer: 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.
