The body force distribution on a quiescent air induced by a slender uniform plasma actuator is calculated using the Navier-Stokes equations and the measured velocity and pressure distributions in order to study the contribution of the pressures. Both velocity distribution and pressure distribution over a perpendicular plane situated in the middle of the actuator are measured simultaneously with a two-dimensional particle image velocimetry and a thin flat static pressure board, respectively. The

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... convergences of timeaveraged velocity components and static pressures versus the sampling time are verified. The pressure distribution over the PIV grid is obtained by the bilinear interpolation. The body-force distribution is calculated asumming that the flow is steady, two-dimensional, incompressibe and laminar. The body force calculated by neglecting the pressure terms in the Navier-Stokes equations is presented for comparing with that including the pressures. The total body forces over four control volumes of different sizes are calculated from the body-force distribution to facilitate the presentations. A parametric study on body force is conducted for the peak-peak ranging from 5.5 kV to 12.3 kV at the carrier frequency of 13.5 kHz.