Numerical Analysis of Flow Field and Heat Transfer of 2D Wavy Ducts and Optimization by Entropy Generation Minimization Method

Abstract

This article provided a research for the trend of heat transfer and flow field through a 2-dimensional wavy duct. To construct a grid mesh, the physical domain was transferred to the computational domain and finite volume scheme was used for discretizing the governing equations. Through the simulation, the flow regime stayed in laminar mode. Constant temperature boundary condition has been used for solid walls. Air was used as a working fluid. Existence of waves makes some phenomenon like flow separation. Effect of Reynolds number, wave width, and wave number has been analyzed and velocity distribution, heat transfer coefficient, and tangential stress were computed for different cases. The final results were compared with the same straight duct. The entropy generation minimization method has been used for better comparison between final results.

Thermal Performance Prediction for Air Flow in a Wavy Corrugated Duct at Steady-State Constant Heat Flux Mode and Early Stages of Turbulent Flow Conditions

“…The first group (π1) is already defined by Eq. (14) and Eq. (15) for the heat transfer enhancement factor and heat transfer coefficient assessments respectively.…”

“…A numerical investigation for the trend of heat transfer and flow field through a two dimensional wavy duct was accomplished [14]. The results showed that by making the waves to be sharper, the heat transfer mechanism will be more powerful and the average Nusselt number will be increased along the length of the duct.…”

“…The previous work of many researchers showed that the experimental or numerical investigations were conducted at either high or low Reynolds number range [5,[13][14][15][16][17]. Further, a narrow range of corrugation angles was experimentally or numerically utilized in these researches.…”