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Author: LeRoy Alton Bromley
Publisher:
ISBN:
Category : Ebullition
Languages : en
Pages : 40
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Book Description
Author: LeRoy Alton Bromley
Publisher:
ISBN:
Category : Ebullition
Languages : en
Pages : 40
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Book Description
Author: R.T. Lahey Jr.
Publisher: Elsevier
ISBN: 1483291383
Category : Technology & Engineering
Languages : en
Pages : 629
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Book Description
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:
Publisher:
ISBN:
Category :
Languages : en
Pages : 107
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Book Description
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 {plus minus}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: L S Tong
Publisher: CRC Press
ISBN: 9781560324850
Category : Science
Languages : en
Pages : 582
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Book Description
Completely updated, this graduate text describes the current state of boiling heat transfer and two-phase flow, in terms through which students can attain a consistent understanding. Prediction of real or potential boiling heat transfer behaviour, both in steady and transient states, is covered to aid engineering design of reliable and effective systems.
Author: Thomas D. Hamill
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 52
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Book Description
Author: Samson Semenovich Kutateladze
Publisher:
ISBN:
Category : Change of state (Physics)
Languages : en
Pages : 224
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Book Description
Author: Frederick F. Simon
Publisher:
ISBN:
Category : Film boiling
Languages : en
Pages : 44
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Book Description
Author: Frank Kreith
Publisher: Springer Science & Business Media
ISBN: 3662301822
Category : Science
Languages : en
Pages : 400
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Book Description
to increase the use of direct contact processes, the National Science Foundation sup ported a workshop on direct contact heat transfer at the Solar Energy Research Insti tute in the summer of 1985. We served as organizers for this workshop, which em phasized an area of thermal engineering that, in our opinion, has great promise for the future, but has not yet reached the point of wide-spread commercial application. Hence, a summary of the state of knowledge at this point is timely. The workshop had a dual objective: 1. To summarize the current state of knowledge in such a form that industrial practi tioners can make use of the available information. 2. To indicate the research and development needed to advance the state-of-the-art, indicating not only what kind of research is needed, but also the industrial poten tial that could be realized if the information to be obtained through the proposed research activities were available.
Author: Juliana Pacheco Duarte
Publisher:
ISBN:
Category :
Languages : en
Pages : 206
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Book Description
The post-critical heat flux (post-CHF) heat transfer is a complex two-phase flow phenomenon divided in two regions: a so-called 'transition boiling' regime characterized by the rapid degradation of heat transfer from a heated surface to a liquid/vapor mixture, and a so-called 'stable film boiling' regime characterized by heat transfer from the heated surface to the vapor. The limit between these two regimes is usually referred as the minimum film boiling temperature (TMFB), and has been interpreted as a temperature from which the liquid no longer can contact the heated surface. To better understand these phenomena, experiments were performed at LWR conditions in the High Pressure Heat Transfer Facility at the University of Wisconsin-Madison. These experiments and subsequent prototypic experiments from the KATHY facility, in Germany, contribute to the limited experimental database on this topic. KATHY data were collected under BWR conditions during Anticipate Transient Without Scram that leads to cycles of dryout and rewet events and ultimately to a failure to rewet of at least one thermocouple. The data were analyzed using a 2D inverse heat transfer computational tool to obtain the surface heat fluxes and temperatures during post-CHF. It was observed that the transition to the film boiling heat transfer regime is a hydrodynamic mechanism dependent on both the pressure and the mass flux, while the local quality affects the mechanism of film formation between a film dryout at high qualities and bubbles coalescence at low qualities. The homogeneous nucleation temperature, which is a thermodynamic mechanism, acts as a lower bound for this transition temperature. The analysis also quantifies different transient boiling curves for flow regimes that differ qualitatively and quantitatively from the typical boiling curve considered in steady-state two-phase heat transfer analysis. The results provide insights into boiling heat transfer and they can change the way we currently model the two-phase post-CHF.
Author: J. D. Seader
Publisher:
ISBN:
Category : Ebullition
Languages : en
Pages : 188
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Book Description
An extensive survey of available information from the literature on heat transfer to boiling hydrogen, nitrogen, and oxygen is presented. Included are a bibliography of available experimental data, a summary of boiling theory, graphical comparisons of the experimental data, and compilations of pertinent physical properties for each of the three cryogenic fluids. Based upon the results of the survey, recommendations are made for a test program to provide critical information there data are lacking.