This study focused on round, hybrid synthetic (non-zero-net-mass-flux) jets impinging on a wall. To complete this study, two additional variants of reversible pulsating jets were investigated, namely synthetic (zero-net-mass-flux) jets and mixed pulsed jets (pulsed jets containing an additional blowing component). For comparison purposes, the continuous jet was used. The working fluid was air. The Reynolds numbers ranged from 4000 to 6000, the dimensionless stroke lengths were 14-46, and the dimensionless orifice-to-wall distances were 2-16 (both related to the orifice exit diameter of 8 mm). The experiments used flow visualization, single-sensor hot-wire measurements, and mass transfer measurements on the wall using the naphthalene sublimation technique. The local heat transfer coefficient, expressed as a Nusselt number, was evaluated using the heat/mass transfer analogy. All tested jets exhibited relatively flat, nearly top-hat velocity profiles. An increase of the Reynolds number by an additional blowing component resulted in a heat/mass transfer enhancement. The flow oscillations (for the present geometry and driven parameters) caused a heat/mass transfer enhancement of 12-40%. The main outcome was that the 26% larger flow rate of the hybrid synthetic jet, versus the conventional synthetic jet, resulted in an 18% increase in the heat transfer rate. These gains were caused by a partial rectification effect of incorporated fluidic diodes, without consuming any additional energy and without introducing movable parts. (C) 2015 Elsevier Ltd. All rights reserved.