Characteristics of an evaporating thin film in a microchannel

Citation data:

International Journal of Heat and Mass Transfer, ISSN: 0017-9310, Vol: 50, Issue: 19, Page: 3933-3942

Publication Year:
2007
Usage 36
Abstract Views 35
Link-outs 1
Captures 123
Readers 123
Citations 200
Citation Indexes 200
Repository URL:
https://docs.lib.purdue.edu/coolingpubs/14
DOI:
10.1016/j.ijheatmasstransfer.2007.01.052
Author(s):
Hao Wang; Suresh V. Garimella; Jayathi Y. Murthy
Publisher(s):
Elsevier BV
Tags:
Physics and Astronomy; Engineering; Chemical Engineering; Meniscus; Thin-film; Triple line; Microchannel; Evaporation; Liquid cooling
article description
An evaporating meniscus in a microchannel is investigated through an augmented Young–Laplace model and the kinetic theory-based expression for mass transport across a liquid–vapor interface. The complete expression for mass transport is employed without any approximations and boundary conditions for the film profile are developed. The thin film and the intrinsic-meniscus regions are distinguished based on the disjoining pressure variation along the meniscus. While heat transfer in the thin-film region is found to be relatively insensitive to channels larger than a few micrometers in radius, that in the intrinsic meniscus is quite sensitive to channel size. The role of evaporation suppression due to capillary pressure in both regions is discussed. Compared to the relatively small contribution to overall heat transfer from the thin-film region, the micro-region (defined here as extending from the non-evaporating region to a location where the film is 1 μm thick) is found to account for more than 50% of the total heat transfer.