Flow and temperature fields around a heated circular cylinder in a fluctuating flow of low Reynolds number - A numerical study on thermo-fluiddynamic response of the hot-wire

The purpose of the present paper is to elucidate the thermo-fluiddynamic characteristics of the constant-temperature hot-wire anemometer by a numerical calculation. Solving the vorticity and energy equations by an implicit difference approximation, obtained are the flow patterns and isotherms around a heated circular cylinder in a fluctuating flow for the time-mean flow of Re = 4 and 40. The drag force and the rates of heat transfer from the cylinder are then determined. Their dependence on the amplitude and frequency of flow fluctuations are discussed, remarking the validity of the quasi-steady approximation.