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Journal ArticleDOI

Two-phase flow and its applications: Past, present, and future

01 Jan 1983-Heat Transfer Engineering (Taylor & Francis Group)-Vol. 4, Iss: 1, pp 67-79
TL;DR: In this article, the authors present three main alternative approaches to the prediction of two-phase flow systems (empirical, analytical, and phenomenological) and explore their advantages and disadvantages.
Abstract: This article presents the three main alternative approaches to the prediction of two-phase flow systems (empirical, analytical, and phenomenological) and explores their advantages and disadvantages. Empirical correlations are the most widely used but have considerable error whereas full analytical treatments are rarely applicable. By understanding the phenomena involved and representing them by simple models, better prediction methods are feasible. This approach is exemplified in its application to the prediction of annular two-phase flow and to the prediction of two-phase flow in equipment, for example a kettle reboiler. The article closes by indicating the possible lines that future development may follow in this area.
Citations
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Journal ArticleDOI
TL;DR: In this paper, an electrical impedance meter is constructed for the measurement of void fraction in micro-channel two-phase flow under adiabatic conditions, and a self-organizing neural network is used for classification of the flow regimes.

49 citations


Cites background from "Two-phase flow and its applications..."

  • ...Flow regime-based correlations are desired in two-phase flow analyses since a single heat transfer correlation does not apply in all flow regimes (Hewitt, 1983)....

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Journal ArticleDOI
TL;DR: In this paper, a nonintrusive electrical impedance-based sensor is developed for measurement of local void fraction in air-water adiabatic flow through rectangular microchannels.
Abstract: A non-intrusive electrical impedance-based sensor is developed for measurement of local void fraction in air–water adiabatic flow through rectangular microchannels. Measurement of the void fraction in microchannels is essential for the formulation of two-phase flow heat transfer and pressure drop correlations, and may enable real-time flow regime control and performance prediction in the thermal regulation of high-heat-flux devices. The impedance response of the sensor to a range of flow regimes is investigated for a configuration with two aligned electrodes flush-mounted on opposing microchannel walls. Numerical simulations performed on a multi-phase domain constructed from three-dimensional reconstruction of experimentally observed phase boundaries along with the corresponding experimental results serve to establish the relationship between void fraction and dimensionless impedance for this geometric configuration. A reduced-order analytical model developed based on an assumption of stratified gas–liquid flow allows ready extension of these calibration results to different working fluids of interest.

20 citations

Journal ArticleDOI
TL;DR: In this paper, boundary layer flow of an electrically conducting magnetohydrodynamic dusty fluid in a porous medium is presented, and the governing nonlinear partial differential equations and their physically realistic boundary conditions are reduced into dimensionless form by using appropriate transformations.

20 citations

Journal ArticleDOI
TL;DR: Synthese des travaux publies et bibliographie mondiale sur le transfert de chaleur pour l'annee 1983 as discussed by the authors.

16 citations

Journal ArticleDOI
TL;DR: In this article, the authors apply the Lie theory to classify the system of three nonlinear partial differential equations according to the admitted Lie point symmetries, and for each case of the classification problem the one-dimensional optimal system is determined.
Abstract: The group properties of the shallow-water equations with the complete Coriolis force is the subject of this study. In particular we apply the Lie theory to classify the system of three nonlinear partial differential equations according to the admitted Lie point symmetries. For each case of the classification problem the one-dimensional optimal system is determined. The results are applied for the derivation of new similarity solutions.

7 citations


Cites background from "Two-phase flow and its applications..."

  • ...We define the infinitesimal one-parameter point transformation ?̄?i = yi ( yj,uB; ε ) , (5) ūA = uA ( yj,uB; ε ) , (6) defined in the space of variables { yi,uA } , and ε is an infinitesimal parameter....

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  • ...From (5) and (6), the infinitesimal transformation is defined ?̄?i = y + εξi ( yj,uB ) (7) ūA = uA + εηA ( yj,uB ) (8) with extension in the jet space { yi,uA,uA ,i , ....

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  • ...We say that the system HA remains invariant under the action of the one-parameter point transformation (5) and (6) if and only if H̄A ( ?̄?i, ūA, ūi , ....

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  • ...Under the action of the one-parameter point transformation (5) and (6), the system of differential equations becomes H̄A ( ?̄?i, ūA, ūi , ....

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  • ...that is, X ( HA ) = 0, (12) where  denotes the Lie derivative with respect the generator X of the infinitesimal transformation (5) and (6), that is, X = ξi ( yj,uB ) ∂i + ηA ( yj,uB ) ∂A....

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References
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Journal ArticleDOI
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.
Abstract: Models are presented for determining flow regime transitions in two-phase gas-liquid flow. The mechanisms for transition are based on physical concepts and are fully predictive in that no flow regime transitions are used in their development. A generalized flow regime map based on this theory is presented.

2,420 citations

Book
01 Jan 1975

1,422 citations

Book
01 Jan 1950
TL;DR: In this article, the authors provide fundamental instruction in heat transfer while employing the methods and language of industry using a course given at the Polytechnic Institute of Brooklyn over a period of years.
Abstract: It is the object of this text to provide fundamental instruction in heat transfer while employing the methods and language of industry. This treatment of the subject has evolved from a course given at the Polytechnic Institute of Brooklyn over a period of years. The possibilities of collegiate instruction patterned after the requirements of the practicing process engineer were suggested and encouraged by Dr. Donald F. Othmer, Head of the Department of Chemical Engineering. The inclusion of the practical aspects of the subject as an integral part of the pedagogy was intended to serve as a supplement rather than a substitute for a strong foundation in engineering fundamentals. These points of view have been retained throughout the writing of the book.

955 citations

Journal ArticleDOI
J.R.S. Thom1
TL;DR: In this paper, a simplified scheme for the calculation of pressure drop during the circulation of a two-phase mixture of boiling water and steam is given, based on the experimental result of the boiler circulation research sponsored at the University of Cambridge by the Water-Tube Boilermakers Association.

624 citations

Journal ArticleDOI
TL;DR: In this article, the graphical procedure of Baroczy and equations for predicting local pressure gradients during the turbulent flow of two-phase mixtures in smooth tubes are transformed to enable their more convenient application to the case of evaporating flow.

611 citations