Abstract
The characteristics of an air flow around a sphere were investigated by means of the measurement of drag and pressure distribution and by the surface oil-flow method in the Reynolds number range from 105 to 4×105. A hysteresis loop was found in the drag coefficient - Re curve and also in the pressure coefficient - Re curve at the critical Reynolds number range between 2.1×105 and 2.5 ×105. In the present paper, the irreversible process of hysteresis was examined in this critical Reynolds number range. The experiments were carried out under steady flow in a wind tunnel of Gottingen type, the turbulence intensity being 0.5 percent.
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