Particle-fluid heat transfer coefficient measurements are performed in a trickle-bed reactor using self-heated thermistor probes. Adding gas in a liquid flow always causes a decrease of the heat transfer while a further increase of gas load causes an acceleration of the liquid and an increase of heat transfer. Our values are badly predicted by mass transfer correlation combined to the Chilton-Colburn analogy. Radial variations of the heat transfer certainly indicate liquid flow non-uniformities.