Author: Robert C. HendricksPublisher:
ISBN:
Category : Film boiling
Languages : en
Pages : 72
Book Description
Film Boiling from Submerged Spheres
Author: Robert C. HendricksPublisher:
ISBN:
Category : Film boiling
Languages : en
Pages : 72
Book Description
Film Boiling from Submerged Spheres
Author: Robert C. HendricksFilm Boiling from a Partially Submerged Sphere in Distilled Water and a Saturated Aqueous-calcium Sulfate Solution
Author: Lawrence Charles FarrarPublisher:
ISBN:
Category :
Languages : en
Pages : 128
Book Description
Film Boiling from Spheres - A Comparison of Theory and Data at Standard and Reduced Gravity
Author: Robert C. HendricksFilm Boiling on Spheres in Single- and Two-phase Flows
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Film boiling on spheres in single- and two-phase flows was studied experimentally and theoretically with an emphasis on establishing the film boiling heat transfer closure law, which is useful in the analysis of nuclear reactor core melt accidents. Systematic experimentation of film boiling on spheres in single-phase water flows was carried out to investigate the effects of liquid subcooling (from 0 to 40 C), liquid velocity (from 0 to 2 m/s), sphere superheat (from 200 to 900 C), sphere diameter (from 6 to 19 mm), and sphere material (stainless steel and brass) on film boiling heat transfer. Based on the experimental data a general film boiling heat transfer correlation is developed. Utilizing a two-phase laminar boundary-layer model for the unseparated front film region and a turbulent eddy model for the separated rear region, a theoretical model was developed to predict the film boiling heat transfer in all single-phase regimes. The film boiling from a sphere in two-phase flows was investigated both in upward two-phase flows (with void fraction from 0.2 to 0.65, water velocity from 0.6 to 3.2 m/s, and steam velocity from 3.0 to 9.0 m/s) and in downward two-phase flows (with void fraction from 0.7 to 0.95, water velocity from 1.9 to 6.5 m/s, and steam velocity from 1.1 to 9.0 m/s). The saturated single-phase heat transfer correlation was found to be applicable to the two-phase film boiling data by making use of the actual water velocity (water phase velocity), and an adjustment factor of (1 -[alpha])[sup 1/4] (with a being the void fraction) for downward flow case only. Slight adjustments of the Reynolds number exponents in the correlation provided an even better interpretation of the two-phase data. Preliminary experiments were also conducted to address the influences of multi-sphere structure on the film boiling heat transfer in single- and two-phase flows.
Film Boiling on Spheres in Single- and Two-phase Flows. Final Report
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 259
Book Description
Film boiling on spheres in single- and two-phase flows was studied experimentally and theoretically with an emphasis on establishing the film boiling heat transfer closure law, which is useful in the analysis of nuclear reactor core melt accidents. Systematic experimentation of film boiling on spheres in single-phase water flows was carried out to investigate the effects of liquid subcooling (from 0 to 40°C), liquid velocity (from 0 to 2 m/s), sphere superheat (from 200 to 900°C), sphere diameter (from 6 to 19 mm), and sphere material (stainless steel and brass) on film boiling heat transfer. Based on the experimental data a general film boiling heat transfer correlation is developed. Utilizing a two-phase laminar boundary-layer model for the unseparated front film region and a turbulent eddy model for the separated rear region, a theoretical model was developed to predict the film boiling heat transfer in all single-phase regimes. The film boiling from a sphere in two-phase flows was investigated both in upward two-phase flows (with void fraction from 0.2 to 0.65, water velocity from 0.6 to 3.2 m/s, and steam velocity from 3.0 to 9.0 m/s) and in downward two-phase flows (with void fraction from 0.7 to 0.95, water velocity from 1.9 to 6.5 m/s, and steam velocity from 1.1 to 9.0 m/s). The saturated single-phase heat transfer correlation was found to be applicable to the two-phase film boiling data by making use of the actual water velocity (water phase velocity), and an adjustment factor of (1-[alpha])14 (with [alpha] being the void fraction) for downward flow case only. Slight adjustments of the Reynolds number exponents in the correlation provided an even better interpretation of the two-phase data. Preliminary experiments were also conducted to address the influences of multisphere structure on the film boiling heat transfer in single- and two-phase flows.
NASA Technical Note
Author: Film Boiling from Spheres in Single- and Two-phase Flow
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Experimental data on film boiling heat transfer from single, inductively heated, spheres in single- and two-phase flow (saturated water and steam, respectively) are presented. In the single-phase-flow experiments water velocities ranged from 0.1 to 2.0 m/s; in the two-phase-flow experiments superficial water and steam velocities covered 0.1 to 0.6 m/s and 4 to 10 m/s, respectively. All experiments were run at atmospheric pressure and with sphere temperatures from 900C down to quenching. Limited interpretations of the single-phase- flow data are possible, but the two-phase-flow data are new and unique.
On the Film Boiling from Small Spheres and the Use of Minimum Film Boiling Temperature in the Modeling of Vapor Explosions
Author: Chunkuan ShihPublisher:
ISBN:
Category : Film boiling
Languages : en
Pages : 466
Book Description
Advances in Cryogenic Engineering
Author: K. D. TimmerhausPublisher: Springer
ISBN: 1468478265
Category : Science
Languages : en
Pages : 510
Book Description
1971 marked the first year since 1956 that the annual Cryogenic Engineering Conference was not held. Instead, the Cryogenic Engineering Conference gave its full support to the XIII International Congress of Refrigeration by working with Commissions I and II of the International Institute of Refrigeration to organize the cryogenic sessions for these two commissions. All of the papers presented at the International Congress of Refrigeration will be published by the IIR as part of the proceedings of that meeting. Even though no Cryogenic Engineering Conference was held in 1971, it became quite evident to the Conference Board that there were sufficient advances in cryogenic engineering to warrant the publication of Volume 17 of the Advances in Cryogenic Engineering. Volume 17 presents the advances in this important field by bringing together in one volume some of the significant papers that have been presented at various technical meetings across the country during the latter half of 1970 and the first part of 1971. In addition, several authoritative review papers have been prepared by invitation of the Cryogenic Engineering Conference Board.