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Many investigation have been carried out for flows around a heated cylinder, either at a high flow speed, which present a case of • forced convection, or for flow at a case of purely natural convection process[1] and [2] . Very few investigation are concerned with an .intermediate case in which forced convection and natural convection :occure simultaneously at a low speed of flow passing a hot cylinder surface[3] . Due to the changes in the flow conditions which accomp-: any the changes in density at a low Reynolds number, the fluid .characteristics in the shear layer become unstable and exhibit waves :with increasing amplitude in the down stream direction, roll up into vortices and finally break down utj and [5] . The separated region itself has unsteady fluctuating character caused by the existing vortices which periodically carried away with the main flow.

The Use of a Lazer Aided-Interferometer for the Study of the Temperature Field in the Wake of a Cylinder