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Karen Vierow

Other affiliations: Purdue University
Bio: Karen Vierow is an academic researcher from Texas A&M University. The author has contributed to research in topics: MELCOR & Heat transfer. The author has an hindex of 11, co-authored 37 publications receiving 384 citations. Previous affiliations of Karen Vierow include Purdue University.

Papers
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Journal ArticleDOI
TL;DR: In this article, the heat transfer and fluid flow phenomena in a horizontal condenser tube were experimentally studied, along with heat transfer reduction effect of a non-condensable gas.

61 citations

Journal Article
TL;DR: The three leading severe accident codes used in the U.S., MELCOR, MAAP4 and SCDAP/RELAP5, are compared in this paper as part of an evaluation of the relative state of severe accident modeling in each of the codes.

60 citations

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TL;DR: In this paper, a generalized diffusion layer model is derived on a mass basis with an exact formulation of mass diffusion, considering the effect of variable mixture molecular weights across the diffusion layer on mass diffusion and fog formation effects on sensible heat.
Abstract: The diffusion layer model for condensation heat transfer of vapor with noncondensable gases was originally derived on a molar basis and developed from an approximate formulation of mass diffusion, by neglecting the effect of variable vapor-gas mixture molecular weights across the diffusion layer on mass diffusion. This is valid for gases having a molecular weight close to that of the vapor or for low vapor mass transfer rates, but it may cause serious error if a large gradient in the gas concentration exists across the diffusion layer. The analysis herein shows that, from the kinetic theory of gases, Fick's law of diffusion is more appropriately expressed on a mass basis than on a molar basis. Then a generalized diffusion layer model is derived on a mass basis with an exact formulation of mass diffusion. The generalized model considers the effect of variable mixture molecular weights across the diffusion layer on mass diffusion and fog formation effects on sensible heat. The new model outperforms the one developed by Peterson when comparing with a wide-ranging experimental database. Under certain limiting conditions, the generalized model reduces to the one developed by Peterson.

45 citations

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TL;DR: In this article, the effects of surface tension on flooding in counter-current two-phase flow in an inclined tube were investigated and an empirical correlation for flooding velocities was proposed that includes functional dependencies on surface tension and tube inclination.

29 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a comprehensive review of research work on countercurrent gas-liquid two-phase flow in a PWR hot leg and provide direction regarding future research on this topic.

29 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a two-dimensional numerical analysis of jet breakup is performed using the MPS method (Moving Particle Semi-implicit Method) which is a particle method for incompressible flows.
Abstract: A continuous jet changes to droplets where jet breakup occurs. In this study, two-dimensional numerical analysis of jet breakup is performed using the MPS method (Moving Particle Semi-implicit Method) which is a particle method for incompressible flows. The continuous fluid surrounding the jet is neglected. Dependencies of the jet breakup length on the Weber number and the Froude number agree with the experiment. The size distribution of droplets is in agreement with the Nukiyama-Tanasawa distribution that has been widely used as an experimental correlation. Effects of the Weber number and the Froude number on the size distribution are also obtained.

171 citations

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TL;DR: In this article, a review of experimental, mechanism and model research progresses in condensation in the presence of non-condensable gases (NCG) is given, with a brief review of dropwise condensation (DWC).

170 citations

Journal ArticleDOI
TL;DR: A survey of the types of dynamic PSA methodologies proposed to date is presented, as well as a brief summary of an example application for the PSA modeling of a digital feedwater control system of an operating pressurized water reactor.

166 citations

Journal ArticleDOI
TL;DR: In this article, a model for wall condensation from a vapor-non-condensable gas mixture was integrated in the ANSYS CFD code, where the condensation phenomenon was modeled from first principles as sink terms for the mass, momentum, species and energy conservation equations.

109 citations

Journal ArticleDOI
TL;DR: A review of the heat transfer literature published in 2005 can be found in this article, where the authors restrict themselves to papers published in English through a peer-review process, with selected translations from journals published in other languages.

96 citations