A simple hydrodynamic model for cocurrent gas-liquid bubbly flow through a packed-bed reactor is developed. The model involves the momentum balance equations for the continuous liquid phase and for the dispersed bubble phase. The liquid-solid interaction force is formulated on the basis of the Kozeny-Carman equation by taking into account the presence of bubbles reducing the available volume for the flowing liquid. The gas-liquid interaction force is evaluated by using the respective solutions of drag coefficient for an isolated bubble in the viscous and Newton regimes. For each regime, a correction is effected to the bubble drag coefficient to take into account the presence of a large number of bubbles. The theoretical predictions of pressure drop and liquid hold-up are compared favourably with experimental data of the literature obtained for the upward and downward packed-bed bubble reactors.