Heat Transfer in Bulk and Thin-Film Fluid Regions of Rectangular Microgroove

摘要

Thin-film evaporation plays a key role within evaporation heat transfer. In the present study, a mathematical model was developed to determine heat transfer through both the thin-film and bulk regions of a liquid in a rectangular microgroove. The model includes the effect of contact angle and wall superheat on heat transfer through both regions. An analytical solution of the temperature distribution with in the meniscus bulk region-where the interface is dominated by surface tension-was first found via a coordinate transformation and the Galerkin method. This temperature distribution was used to determine the heat transfer rate through the bulk liquid region. Results show that the contribution of the heat transfer through the bulk region depends on the contact angle and wall superheat The portion of heat transfer through the bulk region was found to be as high as 22 %; hence heat transfer in this region should not be neglected.