Abstract
A steam injector is a simple, compact and passive pump and also acts as an high-performance direct-contact compact heater It's performance depends on the phenomena of steam condensation onto the water jet surface and heat transfer in the water jet due to turbulence on to the phase-interface. To develop high performance compact feedwater heater, it is necessary to quantify the characteristics between physical properties of the flow field. We .carried out experiments to observe the internal behavior of the water jet as well as measure the velocity of steam jet using a laser doppler velocimetry. As soon as the steam injector start up, the stable water jet was formed in the center of mixing nozzle. The analysis was also conducted by using CFD code, and confirmed that the steam has a high-performance direct-contact heater that was suitable for compact feedwater heater.
