ISSN Online: 2688-7231
ISBN Online: 978-1-56700-524-0
Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
Heat Transfer Analysis of Finned Tube Heat Exchanger with Non-Newtonian fluid and Longitudinal Vortex Generator
The present study numerically addresses the effect of longitudinal vortex generator on heat and flow of non-Newtonian fluid through fin-tube-type heat exchangers. The aqueous solution of cellulose gum that acts as a shear-thinning power-law fluid, is the non-Newtonian fluid (1000-2000 ppm) under consideration for this analysis. A rectangular channel equipped with rectangular winglet pairs (RWP) and three rows of inherent tubes located at a regular interval is considered as a flow domain for the analysis. Inline patterns of tubes placement and common flow up (CFU) orientation of vortex generators is considered for the study. Rectangular winglet pairs as a longitudinal vortex generator of half the channel height were attached with a particular angle of attack and location nearby tubes within the channel. The heated walls of the channel are maintained at a fixed temperature. Three-dimensional numerical simulations were executed on the mentioned channel for Reynolds numbers (200), and the governing equations for continuity, momentum, and energy along with the appropriate boundary conditions are solved using the ANSYS FLUENT. Nusselt number and apparent friction factor were calculated and compared with the Newtonian fluid.