Abstract
This paper presents a 3D numerical analysis of fully developed periodic laminar flow in a circular tube fitted with 45° inclined baffles with inline arrangement. The computations are based on a finite volume method, and the SIMPLE algorithm has been implemented. The characteristics of fluid flow are presented for Reynolds number, Re = 100–1000, based on the hydraulic diameter (D) of the tube. The angled baffles were repeatedly inserted at the middle of the test tube with inline arrangement to generate vortex flows over the tested tube. Effects of different Reynolds numbers and blockage ratios (b/D, BR) with a single pitch ratio of 1 on flow structure in the tested tube were emphasized. The flows in baffled tube show periodic flow atx/D≈2-3, and become a fully developed periodic flow profiles atx/D≈6-7, depending on Re, BR and transverse plane positions. The computational results reveal that the higher of BR and closer position of turbulators, the faster of fully developed periodic flow profiles.
Highlights
The studies of fluid flow structure and heat transfer behavior are among the most important in the design of heat exchangers in applied engineering works
It is a matter of concern that the enhancement of heat transfer rate depends on effect of turbulators that can change flow structure and behavior in the tested section
The results of 45∘ inclined baffle with inline arrangement in circular tested tube are expressed in six parts, such as validation, fully developed periodic concept, effect of transverse plane position, flow structure, effect of Reynolds number, and effect of blockage ratio
Summary
The studies of fluid flow structure and heat transfer behavior are among the most important in the design of heat exchangers in applied engineering works. Heat transfer in a channel with a single baffle in the entrance region Numerical studies for both solid and porous baffles in a two-dimensional channel for the turbulent flow [8] and for the laminar flow regimes [9, 10] were conducted and similar thermal performance results for both the solid and porous cases were reported. The study on developing of periodic flow structure concept has rarely been reported In this present work, the numerical computations for three-dimensional laminar periodic channel flows over a 45∘ inclined baffle are conducted to examine the changes in the flow structure and a way to develop to fully developed periodic flow profile
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