Enhanced Convective and Film Boiling Heat Transfer by Surface Gas Injection
Author : M. R. Duignan
Publisher :
Page : 93 pages
File Size : 32,92 MB
Release : 1992
Category :
ISBN :
Author : M. R. Duignan
Publisher :
Page : 93 pages
File Size : 32,92 MB
Release : 1992
Category :
ISBN :
Author :
Publisher :
Page : 107 pages
File Size : 44,77 MB
Release : 1992
Category :
ISBN :
Heat transfer measurements were made for stable film boiling of water over a horizontal, flat stainless steel plate from the minimum film boiling point temperature, T{sub SURFACE} (approximately)500K, to T{sub SURFACE} (approximately)950K. The pressure at the plate was approximately 1 atmosphere and the temperature of the water pool was maintained at saturation. The data were compared to the Berenson film-boiling model, which was developed for minimum film-boiling-point conditions. The model accurately represented the data near the minimum film-boiling point and at the highest temperatures measured, as long it was corrected for the heat transferred by radiation. On the average, the experimental data lay within ±7% of the model. Measurements of heat transfer were made without film boiling for nitrogen jetting into an overlying pool of water from nine 1-mm- diameter holes, drilled in the heat transfer plate. The heat flux was maintained constant at approximately 26.4 kW/m2. For water-pool heights of less than 6cm the heat transfer coefficient deceased linearly with a decrease in heights. Above 6cm the heat transfer coefficient was unaffected. For the entire range of gas velocities measured [0 to 8.5 cm/s], the magnitude of the magnitude of the heat transfer coefficient only changed by approximately 20%. The heat transfer data bound the Konsetov model for turbulent pool heat transfer which was developed for vertical heat transfer surfaces. This agreement suggests that surface orientation may not be important when the gas jets do not locally affect the surface heat transfer. Finally, a database was developed for heat transfer from the plate with both film boiling and gas jetting occurring simultaneously, in a pool of water maintained at its saturation temperature. The effect of passing nitrogen through established film boiling is to increase the heat transfer from that surface. 60 refs.
Author :
Publisher :
Page : 26 pages
File Size : 25,90 MB
Release : 1991
Category :
ISBN :
A database was developed for heat transfer from a horizontal plate with both film boiling and gas jetting occurring simultaneously, in a pool of water maintained at its saturation temperature. The effect of passing nitrogen through established film boiling is to increase the heat transfer from that surface. At the highest superficial gas velocity measured, approximately 8.5 cm/s, and for a constant surface temperature, the heat transfer increases by a factor of two over the heat transfer with no enhancement by gas flux. Further, as the superficial gas velocity approached zero, the data approach the stable film boiling asymptote. A semi-empirical model was developed and correlated to the database. The result is an equation which represents better than 90% of all the measured data within {plus minus}15% bounds.
Author : John Gordon Collier
Publisher : McGraw-Hill International Book Company
Page : 474 pages
File Size : 14,18 MB
Release : 1981
Category : Science
ISBN :
On its original publication in 1973, this book was the first reference for engineers to fully present the science of boiling and condensation. It dealt especially with the problems of estimating heat transfer rates and pressure drops, with particular attention to the occurrence of boiling and condensation in the presence of forced flows within pipes. The new third edition was written primarily for design and development engineers in the chemical process, power generation, and refrigeration industries, and is meant to be an aid in the design of heat exchangers. It covers recent advances and significantly broadens coverage to flows over tube bundles, with extensive new treatment of two-phase heat transfer regarding refrigerants and petrochemicals. Many new problems have been added at the end of each chapter to enhance the book's use as a text in advanced courses on two-phase flow and heat transfer. Instructors using the book as a course text may obtain full solutions to the end-of-chapter problems by writing to: Science Marketing Dept., Oxford University Press, 198 Madison Avenue, New York, NY 10016 (please include school name and course identification), or by faxing (212) 726-6442.
Author :
Publisher :
Page : 484 pages
File Size : 49,70 MB
Release : 1993
Category : Aeronautics
ISBN :
Author : R.T. Lahey Jr.
Publisher : Elsevier
Page : 629 pages
File Size : 34,47 MB
Release : 2013-10-22
Category : Technology & Engineering
ISBN : 1483291383
This volume covers the modern developments in boiling heat transfer and two-phase flow, and is intended to provide industrial, government and academic researchers with state-of-the-art research findings in the area of multiphase flow and heat transfer technology. Special attention is given to technology transfer, indicating how recent significant results may be used for practical applications. The chapters give detailed technical material that will be useful to engineers and scientists who work in the field of multiphase flow and heat transfer. The authors of all chapters are members of the CMR at Rensselaer, a research centre specializing in the state-of-the-art in multiphase science.
Author : John G. Collier
Publisher : Clarendon Press
Page : 646 pages
File Size : 38,70 MB
Release : 1994-05-19
Category :
ISBN : 0191591262
* Third edition of a well-known and well established text both in industry and for teaching * Fully up-to-date and includes extra problems This book is an aid to heat exchanger design written primarily for design and development engineers in the chemical process, power generation, and refrigeration industries. It provides a comprehensive reference on two-phase flows, boiling, and condensation. The text covers all the latest advances like flows over tube bundles and two-phase heat transfer regarding refrigerants and petrochemicals. Another feature of this third edition is many new problems at chapter ends to enhance its use as a teaching text for graduate and post-graduate courses on two-phase flow and heat transfer. - ;This book is written for practising engineers as a comprehensive reference on two-phase flows, boiling, and condensation. It deals with methods for estimating two-phase flow pressure drops and heat transfer rates. It is a well-known reference book in its third edition and is also used as a text for advanced university courses. Both authors write from practical experience as both are professional engineers. -
Author : LeRoy Alton Bromley
Publisher :
Page : 40 pages
File Size : 16,49 MB
Release : 1949
Category : Ebullition
ISBN :
Author : Sadik Kakaç
Publisher : Springer Science & Business Media
Page : 670 pages
File Size : 34,64 MB
Release : 2013-03-09
Category : Technology & Engineering
ISBN : 9401591598
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 : John C. Chen
Publisher : CRC Press
Page : 402 pages
File Size : 42,57 MB
Release : 2019-08-16
Category : Science
ISBN : 1000716031
This book comprises selected papers from the First International Conference on Convective Flow Boiling. The purpose of the conference is to examine state-of-science and recent developments in technology of flow boiling, i.e., boiling systems which are affected by convective flows.