The time-averaged Effective Momentum Source (EMS) induced by steam injection into a subcooled water pool was measured in a Separate Effect Facility (SEF-POOL) under a wide range of injection conditions. Post-test simulations of large-scale pool experiments conducted in PANDA and PPOOLEX facilities indicate that diffusion of the momentum is another important factor that determines the downstream momentum transport and dynamics of the stratified layer. Thereby, an experimental quantification approach was introduced to measure the streamwise velocity profiles induced by steam injection. It is achieved by using Bubble based Particle Tracking Velocimetry (Bub-PTV) where the velocity is inferred by stereoscopic tracking of the injected air bubbles. In the previous work, we validated the approach using tests with water injection. In this paper, we discuss Bub-PTV application to steam injection tests. The Bub-PTV code was further developed to improve the performance of bubble detection under the steam injection conditions. The momentum induced by steam injection diffuses much faster compared to the single-phase liquid jet injection. We demonstrate that, in the far field where steam has condensed completely, the jet can be simulated using a single-phase solver with the Effective Heat and Momentum sources (EHS/EMS) models along with an additional turbulence source term to account for the turbulence generated in the process of steam condensation. Good agreement can be achieved on the downstream velocity profiles if the added turbulence source is properly calibrated.