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The heat transfer mechanism of a two-dimensional impinging jet with gas-solid suspensions has been investigated through flow measurements using laser-Doppler anemometry. The most striking feature of the flow is the presence of particles rebounding from the impingement plate and of the gas-phase reverse flow caused by those particles. As a result, the turbulent intensity normal to the plate increases markedly near the stagnation point. However, in the wall jet region where the gas-solid interaction is relatively weak, the turbulence structure undergoes only a slight change. The heat transfer experiments have been made varying the loading ratio from zero to 0.8. Around the stagnation point, the Nusselt number is maximally 2.7 times as great as that of the single-phase flow, and the heat transfer enhancement is ascribed to the drastic change in the turbulence structure.