Pressure Drop and Heat Transfer Study of Two-phase Flow in Small Channels PDF Download
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Author: Thanh Nhon Tran
Publisher:
ISBN:
Category : Evaporators
Languages : en
Pages : 452
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Book Description
Author: Thanh Nhon Tran
Publisher:
ISBN:
Category : Evaporators
Languages : en
Pages : 452
Get Book Here
Book Description
Author: Satish Kandlikar
Publisher: Elsevier
ISBN: 9780080445274
Category : Science
Languages : en
Pages : 492
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Book Description
&Quot;This book explores flow through passages with hydraulic diameters from about 1 [mu]m to 3 mm, covering the range of minichannels and microchannels. Design equations along with solved examples and practice problems are also included to serve the needs of practicing engineers and students in a graduate course."--BOOK JACKET.
Author: Sadik Kakaç
Publisher: Springer Science & Business Media
ISBN: 9400968485
Category : Science
Languages : en
Pages : 459
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Book Description
Over the past two decades, two-phase flow and heat transfer problems associated with two-phase phenomena have been a challenge to many investigators. Two-phase flow applications are found in a wide range of engineering systems, such as nuclear and conventional power plants, evaporators of refrigeration systems and a wide vari ety of evaporative and condensive heat exchangers in the chemical industry. This publication is based on the invited lectures presented at the NATO Advanced Research Workshop on the Advances in Two-Phase Flow and Heat Transfer. The Horkshop was attended by more than 50 leading scientists and practicing engineers who work actively on two-phase flow and heat transfer research and applications in dif ferent sectors (academia, government, industry) of member countries of NATO. Some scientific leaders and experts on the subject matter from the non-NATO countries were also invited. They convened to discuss the state-of-the-art in two-phase flow and heat transfer and formulated recommendations for future research directions. To achieve these goals, invited key papers and a limited number of contributions were presented and discussed. The specific aspects of the subject were treated in depth in the panel sessions, and the unresolved problems identified. Suitable as a practical reference, these volumes incorporate a systematic approach to two-phase flow analysis.
Author: Shurong Tian
Publisher:
ISBN:
Category : Evaporators
Languages : en
Pages : 220
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Book Description
"Flow boiling in mini-channels has been the most recent trend in high performance cooling techniques, in spite of an increased pressure drop. An experimental study of pressure and heat transfer characteristics of water in mini-channel evaporators was carried out in this study. The test section consisted of 6, U-shape, parallel, mini-channels. The mini-channels were formed by brazing an etched, flat, stainless steel plate. The hydraulic diameter of a single mini-channel was 0.725 mm. Distilled water, used as the fluid medium, flowed in the mini-channels; while the heating oil flowed on the outside of mini-channel. The inlet temperature of the water was maintained at room temperature and the outlet pressure was ambient pressure. The mass flux was in the range of 87.36 kg/m~ s to 656.75 kg/m2 In order to enhance the heat transfer of the oil side, offset-strip fins were applied on the stainless steel surface of the oil side channel. Parafherm heat transfer oil, the fluid medium, was used on the oil side. The inlet temperature of the oil channel was varied through a range of 100C to 275C. The heat transfer and pressure drop results were obtained as a function of water flow rate and inlet oil temperature. The results indicate that the heat transfer coefficient on the water side was a function of the water mass flow rate, the outlet steam quality, and the oil inlet temperature. The pressure drop of the water side increased with decreasing oil inlet temperature and increasing water mass flow rate in the single-phase flow region. In the two-phase flow region, the pressure drop behavior was more complex since a higher water mass flow resulted in a lower average quality in the evaporator. The vapor generation phenomena associated with boiling and the resultant two-phase flow gives the pressure drop and heat transfer 2-10 fold. The study of two-phase heat transfer visualization gives more detail of the mechanism of two-phase flow and heat transfer. The capillary phenomena play a very important role in the small size channel. In this study, four predominant flow patterns, isolated bubbles, confined bubbles, slug flow and annular flow were observed. As nucleating bubbles were generated and being confined, slug flow easily formed at lower wall temperatures in the mini-channel and resulted in a higher heat transfer coefficient."--Abstract.
Author: R. K. Shah
Publisher: Academic Press
ISBN: 1483191303
Category : Technology & Engineering
Languages : en
Pages : 492
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Book Description
Laminar Flow Forced Convection in Ducts is a sourcebook for compact heat exchanger analytical data. This book describes the analytical solutions for laminar fluid flow and forced convection heat transfer in circular and noncircular pipes, including applicable differential equations and boundary conditions involving velocity and temperature problems of fluid flow. The book also discusses fluid flow—how much power is required to pump fluids through the heat exchanger, as well as the heat transfer—the determination of q" distribution, and the temperature of fluid and walls. The text also analyzes the coolant or heat transfer fluid flows in a nuclear power reactor composed of a bundle of circular section fuel rods located inside a round tube. R.A. Axford addresses fluid flow and heat transfers results for the rod bundle geometry in "Heat Transfer in Rod Bundles." The book also provides an overview and guidelines that can be used for the designer and the applied mathematician. This book is suitable for engineers working in electronics, aerospace, instrumentation, and biomechanics that use cooling or heating exchanges or solar collection systems.
Author: Sadik Kakaç
Publisher: Springer Science & Business Media
ISBN: 9400968450
Category : Science
Languages : en
Pages : 465
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Book Description
Over the past two decades, two-phase flow and heat transfer problems associated with two-phase phenomena have been a challenge to many investigators. Two-phase flow applications are found in a wide range of engineering systems, such as nuclear and conventional power plants, evaporators of refrigeration systems and a wide vari ety of evaporative and condensive heat exchangers in the chemical industry. This publication is based on the invited lectures presented at the NATO Advanced Research Workshop on the Advances in Two-Phase Flow and Heat Transfer. The Horkshop was attended by more than 50 leading scientists and practicing engineers who work actively on two-phase flow and heat transfer research and applications in dif ferent sectors (academia, government, industry) of member countries of NATO. Some scientific leaders and experts on the subject matter from the non-NATO countries were also invited. They convened to discuss the state-of-the-art in two-phase flow and heat transfer and formulated recommendations for future research directions. To achieve these goals, invited key papers and a limited number of contributions were presented and discussed. The specific aspects of the subject were treated in depth in the panel sessions, and the unresolved problems identified. Suitable as a practical reference, these volumes incorporate a systematic approach to two-phase flow analysis.
Author: Afshin J. Ghajar
Publisher:
ISBN: 9783030872823
Category :
Languages : en
Pages : 0
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Book Description
Part I of this book provides design engineers an elemental understanding of the variables that influence pressure drop and heat transfer in plain and micro-fin tubes to thermal systems using liquid single-phase flow in different industrial applications. The author and his colleagues were the first to determine experimentally the very important relationship between inlet geometry and transition. On the basis of their results, they developed practical and easy to use correlations for the isothermal and non-isothermal friction factor (pressure drop) and heat transfer coefficient (Nusselt number) in the transition region as well as the laminar and turbulent flow regions for different inlet configurations and fin geometry. The work presented in Part I of the book provides the thermal systems design engineer the necessary design tools. Part II of this book provides design engineers using gas-liquid two-phase flow in different industrial applications the necessary fundamental understanding of the two-phase flow variables. Two-phase flow literature reports a plethora of correlations for determination of flow patterns, void fraction, two- phase pressure drop and non-boiling heat transfer correlations. However, the validity of a majority of these correlations is restricted over a narrow range of two-phase flow conditions. Consequently, it is quite a challenging task for the end user to select an appropriate correlation/model for the type of two-phase flow under consideration. Selection of a correct correlation also requires some fundamental understanding of the two-phase flow physics and the underlying principles/assumptions/limitations associated with these correlations. Thus, it is of significant interest for a design engineer to have knowledge of the flow patterns and their transitions and their influence on two-phase flow variables. To address some of these issues and facilitate selection of appropriate two-phase flow models, Part II of this book presents a succinct review of the flow patterns, void fraction, pressure drop and non-boiling heat transfer phenomenon and recommend some of the well scrutinized modeling techniques. Reviews pressure drop, heat transfer coefficient, and inlet configuration effect in the transition region Includes void fraction correlations for flow patterns, pipe orientations, models for pressure drop calculations Presents non-boiling two-phase flow heat transfer correlations for different flow patterns and pipe orientations.
Author: United Kingdom Atomic Energy Authority. Research Group
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 552
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Book Description
Author: Afshin J. Ghajar
Publisher: Springer Nature
ISBN: 3030416267
Category : Science
Languages : en
Pages : 136
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Book Description
This book provides design engineers using gas-liquid two-phase flow in different industrial applications the necessary fundamental understanding of the two-phase flow variables. Two-phase flow literature reports a plethora of correlations for determination of flow patterns, void fraction, two- phase pressure drop and non-boiling heat transfer correlations. However, the validity of a majority of these correlations is restricted over a narrow range of two -phase flow conditions. Consequently, it is quite a challenging task for the end user to select an appropriate correlation/model for the type of two-phase flow under consideration. Selection of a correct correlation also requires some fundamental understanding of the two-phase flow physics and the underlying principles/assumptions/limitations associated with these correlations. Thus, it is of significant interest for a design engineer to have knowledge of the flow patterns and their transitions and their influence on two-phase flow variables. To address some of these issues and facilitate selection of appropriate two-phase flow models, this volume presents a succinct review of the flow patterns, void fraction, pressure drop and non-boiling heat transfer phenomenon and recommend some of the well scrutinized modeling techniques.
Author: Brandon S. Field
Publisher: ProQuest
ISBN: 9780549339977
Category :
Languages : en
Pages : 130
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Book Description
As microchannel heat exchangers have become more sophisticated in their design, more exact understanding of the flow inside them is necessary. A decrease in diameter enhances the heat transfer (which takes place at the inner walls of the tubes), but also increases the pressure drop (as the diameter decreases, it becomes like drinking a milkshake through a coffee stirrer). The inclusion of even small amounts of oil in circulation can have a significant effect as well. Historical correlations and studies of two-phase flow have been shown to be insufficient for predicting pressure drops in the smaller channels, due to the different fluid physics that are relevant in flows of small diameter. This study is aimed at understanding the fluid property effects that contribute to pressure drop and flow regime. Two-phase pressure drop data for four refrigerants (R134a, R410A, R290 and R717) were measured in a channel with hydraulic diameter of 148 mum. These data were combined with previous two-phase data of R134a in small channels (hydraulic diameters ranging from 70 to 300 mum) to generate a separated flow model that spans a wide variety of fluid properties. Refrigerant was then mixed with two different viscosities of oil at concentrations ranging from 0.5 to 5% oil, and two-phase pressure drop measurements were taken of those mixtures. Flow visualizations of three of these refrigerants (R134a, R290 and R717) and several concentrations of a R134a-oil mixture were made in a channel with 500 mum hydraulic diameter, and flow regime classifications and comparisons with previous flow maps were made. Finally, a mechanistic description of the two-phase flow that occurs in small channels is put forth, based on the pressure drop measurements and the flow visualizations.
