Effect of Interfacial Forces on Evaporative Heat Transfer in a Meniscus
Abstract
A circular capillary fed heat transfer cell was used to study fluid flow and change-of-phase heat transfer in the contact line region of an evaporating meniscus. Using ellipsometry and microcomputer enhanced video microscopy (based on interferometry), the film thickness profile was measured as a function of the evaporation rate for polar and nonpolar fluids. This profile gives the pressure field. The experimental results confirmed a theoretical model that included the effects of capillarity, disjoining pressure, and conduction on fluid flow and evaporation. The combined results demonstrated that there are significant resistances to heat transfer in a small meniscus due to interfacial forces, viscous stresses and conduction. Therefore, the ideal evaporative heat flux based on kinetic theory cannot be obtained in an evaporating meniscus.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 27, 1991
- Accession Number
- ADA251258
Entities
People
- Jeffrey A. Schonberg
- Peter C . Wayner Jr.
- Sunando Dasgupta
Organizations
- Rensselaer Polytechnic Institute