Experimental study of post-dryout with R-134a upward flow in smooth tube and rifled tubes

Cited 23 time in webofscience Cited 0 time in scopus
  • Hit : 266
  • Download : 0
A study of post-dryout heat transfer was performed with a directed heated smooth tube and rifled tubes using vertical R-134a up-flow to investigate the heat transfer characteristics in the post-dryout region. Three types of rifled tube having different rib height and width were used to examine the effects of rib geometry and compare with the smooth tube, using a mass flux of 70-800 kg/m(2) s and a pressure of 13-24 bar (corresponding to an approximate water pressure of 80-140 bar). Wall temperature distribution in all tubes was strongly dependent oil pressure and mass flux. Wall temperatures of the rifled tubes in the post-dryout region were much lower than for the smooth tube at same conditions. This was attributed to swirl flow caused by the rib. Thus, the thermal non-equilibrium, which is usually present in the post-dryout region, was lowered. The empirical correlation of heat transfer in the smooth tube of the post-dryout region was obtained. The heat transfer correlation for rifled tubes was also obtained as a function of rib height and width with the modification of the smooth tube correlation. (c) 2007 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2008-06
Language
English
Article Type
Article
Keywords

INTERNALLY RIBBED TUBE; BOILING HEAT-TRANSFER; PREDICTION METHODS; ROD BUNDLE; SWIRL FLOW; NONEQUILIBRIUM; CHF; REGIME; MODEL; DROP

Citation

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.51, no.11-12, pp.3153 - 3163

ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2007.08.026
URI
http://hdl.handle.net/10203/92549
Appears in Collection
NE-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 23 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0