Numerical analysis of fluid dynamics and thermal characteristics inside a wavy channel

Purpose - This paper aims to present the results of a numerical investigation of the fluid dynamics and heat transfer behavior of forced incompressible flow inside a rectangular wavy channel. Reynolds numbers, based on hydraulic inlet diameter and bulk velocity, ranging from 500 to 10000 are investigated. Design/methodology/approach - The numerical analysis is performed by means of a finite volume commercial CFD code.. A Reynolds Averaged Navier-Stokes (RANS) approach is applied to a three-dimensional fluid domain over a single module with periodic conditions. Further analysis over six modules is also performed to validate the periodic numerical domain. Findings - Mean velocity and temperature fields are obtained. The global values of Nusselt number are compared with data obtained by an experimental facility with the same geometry and operating with Re from 1000 to 10000. Research limitations/implications - Some limitations related to the numerical approach used are observed in laminar-turbulent transitional regime at Reynolds number between 1000 and 2000 and in the transient prediction. More expensive numerical method might be used (LES approach) to improve transitional prediction. Practical implications - The numerical model can be used to understand flow and thermal fields on the present configuration. A major knowledge of fluid dynamics and heat transfer processes may support the design and optimization of heat exchangers. Originality/value - The validation of numerical model permits supporting experimental campaigns. A faster and cheaper optimization process for improving the performance of the component is thus made available for designers, product engineers and R&D researchers.