Correlations of critical heat flux for flow boiling in tubes at high pressure

The main purpose of the present paper was to develop a correlation which can be used to predict the critical heat flux for the upward flow in an inclined tube at high pressure. At the first step, the correlations of the critical heat flux in vertical and horizontal tubes, which had been proposed previously by the authors, were modified to agree with experimental data newly obtained. Then, a correlation of the critical quality for the inclined tube was developed as a function of the inclination angle with the values of the critical quality for the vertical and horizontal tubes used as bases. This correlation can be applied to every tube inclinations from horizontal to vertical orientation with good accuracy.