A critical review of the flooding literature
S. George Bankoff,Sang Chun Lee +1 more
Reads0
Chats0
TLDR
In the absence of electromagnetic force fields, thermocapillary effects or concentration-capillary effects, countercurrent flow can be sustained only as a result of the difference in the gravitational force per unit volume on the gas and on the liquid as discussed by the authors.Abstract:
Countercurrent flow of a gas and a liquid in direct contact with each other is, of necessity, gravity dominated. That is, in the absence of electromagnetic force fields, thermocapillary effects, or concentration-capillary effects, countercurrent flow can be sustained only as a result of the difference in the gravitational force per unit volume on the gas and on the liquid. If the gas and liquid are simultaneously introduced into a porous medium or into a vertical or inclined pipe, the gas tends to rise relative to the liquid. If conditions allow complete separation, it is possible to maintain steady countercurrent flow in which the liquid discharges at the bottom while the gas flows out from the top. The countercurrent flow is opposed by interfacial friction between the phases, which always seems to increase monotonically as the relative countercurrent mean velocity of the phases increases. Hence, for a given geometry and liquid-gas pair, there is a maximum relative velocity that can be sustained in countercurrent flow. This point is known as the onset of flooding. Further increases in gas or liquid input ratas result in only partial delivery of the liquid out of the bottom. Eventually, if the gas velocity becomes sufficiently high, none of the liquid is delivered at the bottom, and fully cocurrent upward flow is established. If the liquid is being introduced from an upper plenum, none will penetrate into the pipe or porous medium when this second critical gas velocity is reached.read more
Citations
More filters
Journal ArticleDOI
Critical heat flux
TL;DR: A survey of fundamental studies on the critical heat flux (CHF) phenomenon can be found in this paper, where the materials have been classified into four main boiling modes, subdivided into individual important topics and arranged in a proper sequence so as to show the synthetic framework of the CHF phenomenon.
Journal ArticleDOI
Prediction of the slug-to-churn flow transition in vertical two-phase flow
TL;DR: In this paper, an assessment of the various viewpoints on the slug-to-churn flow transition in vertical upward flow in the light of recent experimental results obtained at Harwell Laboratory is made.
Journal ArticleDOI
Flooding and churn flow in vertical pipes
TL;DR: In this paper, a 32 mm dia vertical pipe with various forms of liquid outlet, namely a porous wall, a tapered outlet, and a square-edged outlet, was used to investigate the effect of churn flow on the penetration rate.
Journal ArticleDOI
Linear stability theory of two-layer fluid flow in an inclined channel
TL;DR: In this paper, the linear stability of the two-layer flow of immiscible, incompressible fluids in an inclined channel is considered, and mechanisms for linear instability, and the consequences of competition between mechanisms, are identified.
Journal ArticleDOI
A comparison between flooding correlations and experimental flooding data for gas-liquid flow in vertical circular tubes
K.W. McQuillan,P.B. Whalley +1 more
TL;DR: In this article, the compilation of a data bank containing 2762 experimental flooding data points and the use of this data bank to test a total of 22 flooding correlations were used to predict the most accurate prediction of flooding conditions.
References
More filters
Book
Boundary layer theory
TL;DR: The flow laws of the actual flows at high Reynolds numbers differ considerably from those of the laminar flows treated in the preceding part, denoted as turbulence as discussed by the authors, and the actual flow is very different from that of the Poiseuille flow.
Journal ArticleDOI
A model for predicting flow regime transitions in horizontal and near horizontal gas-liquid flow
Yemada Taitel,A. E. Dukler +1 more
TL;DR: In this article, a generalized flow regime map based on this theory is presented, which is used for determining flow regime transitions in two-phase gas-liquid flow, and the mechanisms for transition are based on physical concepts and are fully predictive.
Journal ArticleDOI
On the generation of surface waves by shear flows
TL;DR: In this paper, an approximate solution to the boundary value problem is developed for a logarithmic profile and the corresponding spectral distribution of the energy transfer coefficient calculated as a function of wave speed.