A heat dissipating module includes a rotational member, a stationary member and a driving member. The rotational member meshes with the driving member and has an uneven surface at a side thereof to space to the stationary member. The stationary member has plural flow passages and each flow passage has an air inlet at an end thereof and an air outlet at another end thereof. When the driving member actuates the rotational member to rotate with the fluid, the fluid enters the stationary member via the inlet and gathers at the outlet before being guided outward for concentrating the air and cooling the heat dissipated object.