Heat Transfer and Turbulent Structure in an Annular Channel With an Obstacle

Abstract

Experimental study of liquid flow and heat transfer in an annular channel is performed. The channel consisted of two coaxial tubes with the diameters of 42.2 and 20 mm. An obstacle covering a quarter of the channel section was placed in the channel to produce a strong three-dimensional disturbance of the flow. Measurements of local wall shear stress are performed using an electrochemical technique. Measurements of heat transfer, time-averaged and fluctuational wall shear stress are performed at various points relative to the obstacle, this allowed to study the field of the hydrodynamic parameters of the flow. The experimental data obtained can be used for validation of existing and developing computer codes accounting for a 3-D structure of turbulent flows.