Numeričko istraživanje prenosa toplote prinudnim strujanjem sa četvrtastih cilindara u kanalu pokrivenom čvrstim zidom - kombinovano stanje

Rajesh Kanna,M Sivasubramanian,M Uthayakumar

doi:10.5937/fmet1701016k

Abstract

Flow over two isothermal offset square cylinders in a confined channel is simulated for different Reynolds number to reveal the forced convection heat transfer from the heated square cylinders to the ambient fluid for the fixed blockage ratio. The channel is covered by solid walls and conjugate heat transfer is considered. Heat transfer from the cylinders to the ambient fluid as well as conducted within solid wall through conjugate interface boundary is investigated for both steady and periodic flow. Simulation is carried out for Reynolds number which varies from 10 to 100 and Prandtl number equals 0.71. The onset of vortex begins when Reynolds number equals to 48. The conjugate interface temperature decreases when Reynolds number increases. The isotherm in the solid wall shows two dimensionality near cylinder region. The upstream cylinder results in higher Nusselt number during steady state and downstream cylinder results in higher Nusselt number for periodic flow.

Highlights

Conjugate heat transfer has many practical applications such as electronics cooling, turbine blade cooling, solar collectors and many more
The results show that the drag coefficient, Strouhal number and cylinder Nusselt number decrease as the heated cylinder approaches the wall
This study aims to investigate the forced convection heat transfer from two isothermal square cylinders placed in a channel offset to each other

Summary

Introduction

Conjugate heat transfer has many practical applications such as electronics cooling, turbine blade cooling, solar collectors and many more. In conjugate heat transfer mode the heat transfer in solid region is simultaneously solved along with energy equation in fluid region to find steady state results [1]. Flow over bluff body has received attention by many researchers for the past few decades because of its complex fluid dynamics and large industrial applications. Laminar flow over circular cylinder [2] was investigated to understand the vortex shedding, drag and lift coefficient and shedding frequency. Similar study was carried out by Okajima [3] for a square cylinder limited to laminar range. Numerous studies were conducted to explore the angle of incidence in the bluff body [5, 6]

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