An experimental study of gas-liquid flow in a vertical bundle of 37 rods in a triangular arrangement was performed. An interaction of gas phase with a spacing grid was considered. Gas was injected through a 1.2 mm capillary tube inserted into one of the sub channels of the central rod. Void fraction measurements were performed by a conductivity probe mounted on the central rod Measurements were performed in the flow region just downstream the spacing grid. The processing of the conductivity probe records allowed to obtain three-dimensional distribution of the gas phase around the central rod of the bundle. Measurements performed demonstrated a non-uniform distribution of the gas phase over the circumference of the central rod in the region close to the grid. The data obtained allow to estimate the rate of gas transfer between the sub channels.

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