Experimental and theoretical investigation of waterhammer induced by steam-water countercurrent flow a long horizontal pipe = 긴 수평관에서 기액 역층류 유동에 의한 수격작용에 관한 실험 및 이론적 연구

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 249
  • Download : 0
The condensation-induced waterhammer in a horizontal pipe is the most damaging form of waterhammer and its diagnosis is extremely difficult because of the complex nature of the underlying phenomena that occur at the steam-water interface. The current modeling concepts do not predict well the lower and upper boundaries of the waterhammer accident occurred at San Onofre nuclear power station. In the present work, improved models that can predict the lower and upper boundaries of the initiation of waterhammer induced by steam-water countercurrent flow in a long horizontal pipe is derived. In the analysis the interfacial friction factor, the criterion of onset of waterhammer, and the interfacial heat transfer coefficient are the major constitutive relations, but there are several limited ranges in the application of current correlations being used. Several experiments have been conducted in adiabatic counter-current stratified flow with round pipe and rectangular duct test sections to develop the interfacial friction factor, the criterion of initiation of waterhammer, and the correlation of water depth. First, an adiabatic semi-empirical correlation for interfacial friction factor has been developed based on the surface roughness concept. A comparison of the measured data including others with the predictions of the present correlation shows that the agreement is within ±30%error and that the present correlation covers a broader range of water flow rate than the previous correlations. Second, a theory which can calculate the wave height and the criterion of onset of slug flow in a stratified wavy flow regime has been developed based on the total energy concept. This theoretical criterion agrees better with the measured data than the other criteria available in the literature, but predicts about 92~107%. An empirical formulus for the criterion has been also developed and compared with others. Third, correlations which can predict the slope of liquid surface and ...
Advisors
Chun, Moon-Hyun전문헌
Description
한국과학기술원 : 원자력공학과,
Publisher
한국과학기술원
Issue Date
1994
Identifier
68959/325007 / 000825914
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력공학과, 1994.2, [ xvi, 205 p. ]

URI
http://hdl.handle.net/10203/48817
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=68959&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0