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Title: HYDRODYNAMIC ASPECTS OF NUCLEATE POOL BOILING. PART I. THE REGION OF ISOLATED BUBBLES

Abstract

The theory of Bosnjakovic and Jakob (bubble growth is limited by the rate of heat transfer) is extended to predict the rate of vapor formation, in steady or transient boiling, with the assumption that the evaporation takes place at the base of the bubble. The predicted values are in satisfactory agreement with experimental results. An analytical expression, in terms of the bubble population, is derived for the velocity of the liquid adjacent to the heating surface. This velocity is used to estimate the heat transfer in nucleate boiling. Experimental data indicate that when bubbles can be considered as isolated, the heat transfer in nucleate boiling is intermittent and bears a similarity to the transfer of heat from a flat plate with boundary-layer formation. Experimental data indicate also that as the vapor void fraction (vapor hold-up) on the heating surface increases, a change occurs in the hydrodynamic conditions of the two- phase system. This change occurs at a heatflux density well below the critical heat flux. The vapor removal is altered from an intermittent to a continuous process. The mechanism of heat transfer is affected but not the process. An equation is derived for analyzing the relation which exists between themore » heat-flux density, the liquid-superheat temperature, and the bubble population in nucleate pool boiling. The predicted values are in qualitative and quantitative agreement with available experimental results. (auth)« less

Authors:
Publication Date:
Research Org.:
Ramo-Wooldridge. Div. of Thompson Ramo Wooldridge Inc., Canoga Park, Calif.
OSTI Identifier:
4128751
Report Number(s):
TID-6338; RW-RL-164
NSA Number:
NSA-14-025615
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-60
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
ENGINEERING AND EQUIPMENT; BOILING; BUBBLES; BURNOUT; DISTRIBUTION; EVAPORATION; FLUID FLOW; HEAT FLOW; HEAT TRANSFER; HEATING; HYDRAULICS; MATHEMATICS; MECHANICS; NUCLEATE BOILING; QUANTITATIVE ANALYSIS; QUANTITY RATIO; SUPERHEATING; SURFACES; TESTING; TRANSIENTS; VAPORS; VELOCITY; VOID FRACTION

Citation Formats

Zuber, N. HYDRODYNAMIC ASPECTS OF NUCLEATE POOL BOILING. PART I. THE REGION OF ISOLATED BUBBLES. Country unknown/Code not available: N. p., 1960. Web.
Zuber, N. HYDRODYNAMIC ASPECTS OF NUCLEATE POOL BOILING. PART I. THE REGION OF ISOLATED BUBBLES. Country unknown/Code not available.
Zuber, N. Wed . "HYDRODYNAMIC ASPECTS OF NUCLEATE POOL BOILING. PART I. THE REGION OF ISOLATED BUBBLES". Country unknown/Code not available.
@article{osti_4128751,
title = {HYDRODYNAMIC ASPECTS OF NUCLEATE POOL BOILING. PART I. THE REGION OF ISOLATED BUBBLES},
author = {Zuber, N},
abstractNote = {The theory of Bosnjakovic and Jakob (bubble growth is limited by the rate of heat transfer) is extended to predict the rate of vapor formation, in steady or transient boiling, with the assumption that the evaporation takes place at the base of the bubble. The predicted values are in satisfactory agreement with experimental results. An analytical expression, in terms of the bubble population, is derived for the velocity of the liquid adjacent to the heating surface. This velocity is used to estimate the heat transfer in nucleate boiling. Experimental data indicate that when bubbles can be considered as isolated, the heat transfer in nucleate boiling is intermittent and bears a similarity to the transfer of heat from a flat plate with boundary-layer formation. Experimental data indicate also that as the vapor void fraction (vapor hold-up) on the heating surface increases, a change occurs in the hydrodynamic conditions of the two- phase system. This change occurs at a heatflux density well below the critical heat flux. The vapor removal is altered from an intermittent to a continuous process. The mechanism of heat transfer is affected but not the process. An equation is derived for analyzing the relation which exists between the heat-flux density, the liquid-superheat temperature, and the bubble population in nucleate pool boiling. The predicted values are in qualitative and quantitative agreement with available experimental results. (auth)},
doi = {},
url = {https://www.osti.gov/biblio/4128751}, journal = {},
number = ,
volume = ,
place = {Country unknown/Code not available},
year = {1960},
month = {1}
}

Technical Report:
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