Gravity-Controlled Condensation Heat Transfer of Carbon Dioxide. Relationship between condensation condition and heat transfer.

Abstract

This paper concerns the condensation of carbon dioxide and its heat transfer on a vertical surface in the subcritical region. In this region, physical properties of carbon dioxide show marked temperature and pressure dependence. In particular, as the pressure increases and approaches the critical pressure, the difference in the properties of liquid and vapor, and surface tension approach zero. Therefore, condensate flow from natural convection decreases and configuration of condensation may differ from that at lower pressure. In this study, the configuration of condensation is observed and at the same time, condensation heat transfer is obtained by measuring the volume of condensate. Heat transfer is discussed in connection with the configuration of condensation.