The 13th international Symposium on Flow Visualization

نویسنده

Jean Pierre Prenel

چکیده

The flow around heated cylinders has already been investigated by many researchers. Object of the present examination is an electrically heated circular cylinder placed in a parallel flow in a wind tunnel. The experimental tests were carried out at low Reynolds numbers (Re<200), thus the flow field was approximately two dimensional (same flow in every normal plan of the heated circular cylinder). The relationship between the vortices and the heat transfer was determined by relevant numerical simulations. Experimental results showed that vortices are shed with a frequency almost identical to that of the heat transfer from the cylinder. this transfer takes place in ‘heat packages’. Validation of numerical simulations (in case of velocity field) was done with the help of PIV (Particle Image Velocimetry). The main objective of the present experimental investigation is validating the temperature field results of numerical simulations. Two dimensional flow and the principle of Schlieren measurement technique were used to visualize the temperature field. The Z-type Schlieren technique was applied to measure the temperature distribution. The experiments were carried out at free and forced convection in a 0.5x0.5 m cross-section wind tunnel. The measurement technique and results were shown at different levels of forced convection.

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