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Author: Sadik Kakaç
Publisher: Springer
ISBN: 9789048151905
Category : Science
Languages : en
Pages : 0
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Book Description
Heat transfer enhancement in single-phase and two-phase flow heat exchangers in important in such industrial applications as power generating plant, process and chemical industry, heating, ventilation, air conditioning and refrigeration systems, and the cooling of electronic equipment. Energy savings are of primary importance in the design of such systems, leading to more efficient, environmentally friendly devices. This book provides invaluable information for such purposes.
Author: Husam Rajab
Publisher:
ISBN:
Category :
Languages : en
Pages : 137
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Book Description
Author: V. G. Rifert
Publisher: WIT Press (UK)
ISBN:
Category : Science
Languages : en
Pages : 402
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Book Description
In processes with condensation of steam-to-gas compositions or refrigerative agents an intensification of condensation is often required because thermal resistance on the condensation side can be greater than the thermal resistance of the heat transfer wall on the cooling side. In this work, a pair of researchers from the National Technical U. of Ukraine and the State Academy of Refrigeration (Ukraine) provide information about the enhancement of condensation, including research results from the former USSR they feel deserves wider dissemination as well as discussion of different theoretical models of the condensation process. The US office of WIT Press is Computational Mechanics. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).
Author: Sadik Kakaç
Publisher: Springer Science & Business Media
ISBN: 9401591598
Category : Technology & Engineering
Languages : en
Pages : 670
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Book Description
Heat transfer enhancement in single-phase and two-phase flow heat exchangers in important in such industrial applications as power generating plant, process and chemical industry, heating, ventilation, air conditioning and refrigeration systems, and the cooling of electronic equipment. Energy savings are of primary importance in the design of such systems, leading to more efficient, environmentally friendly devices. This book provides invaluable information for such purposes.
Author: Sujoy Kumar Saha
Publisher: Springer
ISBN: 3030207552
Category : Science
Languages : en
Pages : 121
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Book Description
This Brief concerns heat transfer and pressure drop in heat transfer enhancement for boiling and condensation. The authors divide their topic into six areas: abrasive treatment and coatings, combined structured and porous surfaces, basic principles of boiling mechanism, vapor space condensation, convective vaporization, and forced condensation inside tubes. Within this framework, the book examines range of specific phenomena including abrasive treatment, open grooves, 3D cavities, etched surfaces, electroplating, pierced 3D cover sheets, attached wire and screen promoters, non-wetting coatings, oxide and ceramic coatings, porous surfaces, structured surfaces (integral roughness), combined structured and porous surfaces, composite surfaces, single-tube pool boiling tests, theoretical fundamentals like liquid superheat, effect of cavity shape and contact angle on superheat, entrapment of vapor in cavities, nucleation at a surface cavity, effect of dissolved gases, bubble departure diameter, bubble dynamics, boiling hysteresis and orientation effects, basic principles of boiling mechanism, visualization and mechanism of boiling in subsurface tunnels, and Chien and Webb parametric boiling studies.
Author: Sujoy Kumar Saha
Publisher: Springer
ISBN: 3030207730
Category : Science
Languages : en
Pages : 125
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Book Description
This Brief deals with electrode design and placement, enhancement of both liquid and gas flow, vapor space condensation, in-tube condensation, falling film evaporation, correlations. It further provides a fundamental understanding of boiling and condensation, pool boiling, critical heat flux, convective vaporization, additives for single-phase liquids like solid particles, gas bubbles, suspensions in dilute polymer and surfactant solutions, solid additives and liquid additives for gases, additives for boiling, condensation and absorption, mass transfer resistance in gas phase (condensation with noncondensible gases, evaporation into air, dehumidifying finned tube heat exchangers, water film enhancement of finned tube exchanger), controlling resistance in liquid phase, and significant resistance in both phases. The volume is ideal for professionals and researchers dealing with thermal management in devices.
Author: Salim Newaz Kazi
Publisher: BoD – Books on Demand
ISBN: 180355939X
Category : Science
Languages : en
Pages : 292
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Book Description
This book introduces the fundamentals, enhancements, applications, and modeling of heat transfer phenomena. Topics covered include heat transfer equations and applications in the estimation of heat energy transportation, heat transfer in specific applications, microchannel flow, condensation of refrigerants in modified heat exchanger tubes, alteration of tube surface texture for augmentation of heat transfer, boiling, etc. Also considered are fouling mitigation approaches to prolong heat exchanger operation, as well as tube coatings, heat exchanger digital twins, and various surface alteration techniques. Double-pass solar air heating and phenomena including heat transfer through thin liquid film and surface texture alteration for boiling heat transfer are discussed.
Author: Karl Stephan
Publisher: Springer Science & Business Media
ISBN: 3642524575
Category : Technology & Engineering
Languages : en
Pages : 342
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Book Description
I welcome the opportunity to have my book translated, because of the great emphasis on two-phase flow and heat transfer in the English-speaking world, as related to research, university education, and industrial practice. The 1988 Springer-Verlag edition of "Warmeiibergang beim Kondensieren und beim Sieden" has been enlarged to include additional material on falling film evaporation (Chapter 12) and pressure drop in two-phase flow (Chapter 13). Minor errors in the original text have also been corrected. I would like to express my sincere appreciation to Professor Green, Asso ciate Professor of German at Rensselaer, for his excellent translation and co operation. My thanks go also to Professor Bergles for his close attention to technical and linguistic details. He carefully read the typescript and made many comments and suggestions that helped to improve the manuscript. I hope that the English edition will meet with' a favorable reception and contribute to better understanding and to progress in the field of heat transfer in condensation and boiling. February 1992 K. Stephan Preface to the German-Language Edition This book is a continuation of the series "Heat and Mass Transfer" edited by U. Grigull, in which three volumes have already been published. Its aim is to acquaint students and practicing engineers with heat transfer during condensa tion and boiling, and is intended primarily for students and engineers in mechanical, chemical, electrical, and industrial processing engineering.
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: E. K. Kalinin
Publisher: Begell House Publishers
ISBN: 9781567001679
Category : Electronic books
Languages : en
Pages : 392
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Book Description
The method for creation of effective heat transfer surfaces for one-phase flows, boiling, condensation, and radiation are considered. The results of experimental and analytical studies of the laws governing enhancement of heat transfer processes and influence of a macro- and microstructure of surfaces on the mechanism and characteristics of heat transfer are systematized. The concept of a real phase interface - a transition surface region - is introduced. The methods of enhancement of heat transfer in different channels of heat exchanging apparatus are considered. Practical recommendations for the choice of heat transfer enhancement, calculations of heat transfer, and hydraulic losses are given.
Author: Yajing Zhao (Mechanical engineer)
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Steam power plants, which contribute to over 50% of energy production globally, rely on condensers to control system-level energy efficiency. Due to the high surface energy of common heat exchanger materials, the vapor condenses by forming a continuous liquid film with low thermal conductivity (filmwise condensation), hindering heat transfer from the vapor side to the condenser surface. Hydrophobic surfaces achieved by either chemical methods (e.g., coating treatment) or physical methods (e.g. structures design) have shown great promise in enhancing condensation heat transfer by promoting dropwise condensation. However, the short lifetime and high fabrication cost of most of these hydrophobic surfaces remain a challenge for long-term and large-scale industrial applications. A promising solution to enhancing condensation heat transfer in a robust and scalable manner is to control the thickness and thermal conductivity of the condensate film, which we term thin-film condensation. This can be achieved by sandwiching a thin layer of porous metal wick between a hydrophobic membrane and the condenser surface to confine the condensed liquid, forming a thin liquid-metal composite film that significantly improves the effective thermal conductivity of the condensate-filled porous media. In this work, we designed, fabricated, tested, and demonstrated thin-film condensation heat transfer using commercially available materials and scalable approaches. First, we proved the concept using biphilic, microchannel-assisted hierarchical copper surfaces made of commercially available copper foams and copper meshes. Condensation heat transfer on the hierarchical copper surfaces was characterized to be up to 2x as compared to the conventional filmwise condensation, even with flooding on the surface due to the defects on the mesh and the coating. Then, we investigated electrospinning as a potential approach to customize hydrophobic membranes for the thin-film condenser surfaces. The key benefit of the hydrophobic membrane in the surface design is to generate capillary pressure through micro/nanoscale pores, which acts as the driving force for the condensate flow in the metal wick. We conducted a parametric study on the effects of several key fabrication parameters on the pore size of the electrospun membrane, with the help of the fractional factorial design. Solution feeding rate was found to be the most impactful parameter on the membrane pore size and should be considered the most during membrane optimization. A heat and mass transfer model was developed to predict the heat transfer performance of the thin-film condenser surfaces made of electrospun membranes and porous copper wicks. Upon careful design of the surface structures, an over 5x heat transfer enhancement is expected on these thin-film condensers, which is comparable to the state-of-the-art dropwise condensation. Finally, a techno-economic analysis was conducted on the thin-film condensers. The result shows that the additional material for the condenser tube modification costs less than 10% of the condenser cost. However, with the expected 5x steam-side condensation heat transfer performance, thin-film condensers will be able to increase power plants' output by 2-6%, which is equivalent to over $10B of the value proposition for steam power plants across the globe.
