Calculation of pressure drop inside condensing vertical pipes in new inlet pressures using a new modified three-fluid model H.

Using the new modified three-fluid model, the effect of variation of inlet pressure on predictionsof pressure drop in the downward condensing annular flow of steam inside vertical pipes is studied.to achieve this, using the new modified three-fluid model and stevanovic et al.'s correlation for thesteamliquid film interfacial friction coefficient, pressure drop is calculated in two new inlet pressures(i.e., 1.5 and 2.5 (mpa)), for which there is no available experimental data of pressure drop. the pressuredrop predictions of the new modified three-fluid model and those of the stevanovic et al.'s correlation arecompared.