Numerical Investigations of Heat Transfer and Pressure Drop of Condensation in Streamwise-Periodic Herringbone-type Plate Channels

摘要

Turbulent fully developed periodic condensation heat transfer and pressure drop in herringbone-type plate heat exchangers for R134a and steam were numerically investigated. A mixture model was introduced and the equations governing the two phase flow were simplified. Thus a single phase periodic flow with mixture properties was solved for R134a. For Steam a separate empirical model was used. The governing equations were solved numerically by a finite-volume method for elliptic flows in complex geometries using collocated variable arrangement. The influence of mass flux and vapor quality on frictional pressure drop for refrigerant was investigated. The heat transfer was studied using a modified film wise condensation theory in which the interfacial shear stress was taken into account. The performance of the model was assessed by comparing the computed data with experimental results.