Boiling heat transfer, coefficients fundamentals

The fundamental dependence of the heat transfer coefficients on the quality is illustrated in Fig. 4.32. In regions of low quality x nucleate boiling occurs and the heat transfer coefficient is principally dependent on the heat hux. The quality increases downstream, and with that the how velocity also increases. The heat fed into the system is mainly transferred by convection from the tube wall to the vapour-liquid how. A conversion from nucleate boiling to convective boiling... 

---