The point of net vapor generation (NVG), also referred to as the point of onset of significant void (OSV), is an important operational threshold for heated channels that carry subcooled liquid...

The point of net vapor generation (NVG), also referred to as the point of onset of significant void (OSV), is an important operational threshold for heated channels that carry subcooled liquid coolants and are designed to operate in liquid forced convection heat transfer regime. For water, a widely used empirical correlation for OSV point, due to Saha and Zuber (1974), is as follows. When Pe <>_HC_P/k, NVG occurs when

In an experiment, water at 1 bar pressure and 95°C temperature flows through a 5 mm diameter heated tube. For mean velocities of 1.15 and 2.63 m/s, calculate the wall heat flux that would cause the OSV.