Falling film evaporation heat transfer of water/salt mixtures from roll-worked enhanced tubes and tube bundle

Authors
Citation
Zh. Liu et J. Yi, Falling film evaporation heat transfer of water/salt mixtures from roll-worked enhanced tubes and tube bundle, APPL TH ENG, 22(1), 2002, pp. 83-95
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
APPLIED THERMAL ENGINEERING
ISSN journal
1359-4311 → ACNP
Volume
22
Issue
1
Year of publication
2002
Pages
83 - 95
Database
ISI
SICI code
1359-4311(200201)22:1<83:FFEHTO>2.0.ZU;2-2
Abstract
An experimental study is carried out for enhancement of falling film evapor ation heat transfer of pure water and water/salt mixtures on horizontal smo oth tube and two kinds of structured tube bundles under atmospheric pressur e. The experimental results show that the low-cost roll-worked tube can gre atly enhance the evaporation heat transfer performance of the falling film, and make it comparable to that of expensive commercial enhanced tubes such as GEWA-T tubes, TE tubes and HF tubes, even at low and moderate heat flux levels. The average evaporation heat transfer coefficients for the roll-wo rked tube bundle are basically independent from the parameters tested such as flow and heating conditions, salt-concentrations, as well as geometries of the tube bundles. The present experimental data result in a constant hea t transfer coefficient; alpha approximate to 20 kW/m(2) K, in the convectiv e heat transfer range of the heat fluxes < 10(5) W/m(2). (C) 2001 Elsevier Science Ltd. All rights reserved.