Heat Transfer and Turbulence Measurements in Supercritical Pressure Water

Abstract

A series of integral heat transfer measurements in a square annular flow passage were performed for bulk water temperatures of 175-400 degrees C with an upward mass velocity of 315 and 1000 kg/m2s and heat fluxes of 0, 220, and 440 kW/m2, all at a pressure of 25 MPa. Measured mean and turbulent velocities in conjunction with simulations with the CFD code FLUENT show that buoyancy effects cause a significant reduction in turbulent quantities at a radial location similar to what is called the law of the wall region for isothermal flow.