Share

IIR document

Numerical modeling of the effects of oil on annular laminar film condensation in minichannels.

Author(s) : NEBULONI S., THOME J. R.

Type of article: Article, IJR article

Summary

This paper presents a numerical model to predict laminar film condensation heat transfer in small channels of different internal geometries for miscible refrigerant-oil mixtures. The model includes the contributions of surface tension, axial shear stresses induced by the vapor to film interface, gravitational forces, wall conduction and the oil concentration dependency on the liquid’s dynamic viscosity. For the same operative conditions and fluid, the presence of the oil has a significant negative impact on the thermal performance at high vapor qualities, with the degradation depending on the channel’s shape. Presently, the performance of different channel shapes (circular and flattened shapes) are simulated and compared. It is concluded that the presence of oil has slightly less effect on capillary-dominated regimes (i.e. when the surface tension has a strong effect on the film dynamics) than on gravity-dominated regimes (i.e. annular stratified regime).

Available documents

Format PDF

Pages: 1545-1556

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Numerical modeling of the effects of oil on annular laminar film condensation in minichannels.
  • Record ID : 30008169
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 5
  • Publication date: 2013/08

Links


See other articles in this issue (16)
See the source

Indexing