Abstract

The present study focuses on the analysis of flow characteristics inside a 180° bent channel by adopting two distinct RANS model namely, Realizable k-ϵ and Reynolds Stress Model (RSM). The computation results, obtained from both case study have been validated against experimental data at different cross-sections throughout the bend region and downstream tangent for velocity distribution. The anisotropic behavior of turbulent flow was illustrated for both case study inside the bend region and it has been established that after 3° the flow gradually became more intense at the outer core. Pressure coefficient throughout the u-channel was depicted for both turbulence model and a characteristic feature has been obtained. Due to centrifugal force and high inlet Reynolds number, a pair of counter-rotating Dean vortices were constructed at different stations inside the bend region. From both demonstrations, it was revealed that, Realizable k-ϵ model provided relatively better approximation.

Highlights

  • Fluid flow in curved pipe has a wide range of industrial application such as HVAC appliance, Turbomachinery, heat exchangers, CANDU type reactor, High Temperature Gas Cooled Reactor (HTGR), Pressurized Water Reactor (PWR), torus reactor along with providing more flexibility in pipeline network

  • Analysis of fluid flow in pipe bend plays a significant role in medical science, as the flow pattern is similar to the blood flow in vain or artery

  • For the change of its direction secondary cross-stream flow reversal occurs whereas variation in the Reynolds number as well as curvature ratio influence the formation of the secondary flow [1]-[4]

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Summary

INTRODUCTION

Fluid flow in curved pipe has a wide range of industrial application such as HVAC appliance, Turbomachinery, heat exchangers, CANDU type reactor, High Temperature Gas Cooled Reactor (HTGR), Pressurized Water Reactor (PWR), torus reactor along with providing more flexibility in pipeline network. Sugiyama and Hitomi [17] used the experimental apparatus of proposed by Sudou and Takami for the numerical analysis of the turbulent flow through a 180° curved pipe with an algebraic Reynolds stress model. They concluded a rigorous investigation on the behavior of anisotropic turbulent characteristics and the distribution of Reynolds stresses. Guan and Martonen used FIDAP to examine the axial and secondary motions in both the developing and fully developed regions of flow [18] After validation of their results with the experimental data they suggested that, flow patterns and their commensurate effects on particle and gas transport can be simulated by the modeling technique. Results obtained from both case studies were compared to illustrate the pressure coefficient along the problem section

PROBLEM DEFINITION
Governing Equations and Turbulence Modelling
NUMERICAL METHODOLOGY
Grid Configuration
VALIDATIONS AND DISCUSSIONS
REMARKS

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