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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Numerical analysis of condensation induced water-hammer in horizontal piping systems

Eichenberg, Thomas William 21 August 1990 (has links)
Condensation Induced Water-Hammer, CIWH, has been an historical problem for the nuclear power industry over the past 2 decades. It has caused damage to plant systems, and considerable anguish to plant operators. This thesis has embarked on an attempt to characterize the fluid motion, heat transfer, mixing, and stability of a horizontal, stratified flow of steam over subcooled water. A literature review was conducted to determine the state of numerical and analytical methods which have been applied to this problem. The result of the review has led to the implementation of new analytical interfacial stability models. Information from the review has also led to the development of correlations for wave frequency and amplitude on the phase interface. A numerical model has been developed to estimate the temperature profile on the phase interface. Also, the model will construct, by use of the above correlations, an estimate of the interface wave structure. This wave structure is then evaluated against a non-linear model for interface stability to determine the onset of slug formation. The numerical model has been used to evaluate two known CIWH events. The results indicate that the onset of slug formation is necessary, but not sufficient, to ensure a water-hammer event. The results imply that there is the possibility that once a slug has formed, it may break up before a trapped steam void can fully collapse. The model also indicates that CIWH in steam generator, feedwater nozzle sections is not due to the formation of slug on an unstable phase interface. Rather, CIWH may occur when the liquid level inside of the feedwater nozzle is above the top of the feedring, thus creating an isolated steam pocket. The rapid condensation of the trapped steam in the causes CIWH. This particular result implies that it may be possible to completely avoid CIWH in the feedwater nozzle altogether. / Graduation date: 1991
2

A study of the reflection and transmission of a water-hammer pressure wave from a tee

Edge, Billy L. January 1965 (has links)
A theoretical analysis was made of the reflected and transmitted waves which were produced when a water-hammer pressure wave encountered a tee in the pipeline. The analysis included the fact that a hydraulic loss existed across the tee. Relationships were developed for determining the magnitude of the reflected and the transmitted waves. However, these relationships were only suitable for the case of instantaneous valve closure, due to the relative magnitudes of the terms involved. An experimental analysis was made in order to verify the theoretical relationships. However, due to malfunctions of the equipment and the ill designed pipeline configuration, very little of the information that was desired could be obtained. Hence, the theoretical analysis could not be verified. / Master of Science

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