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Title: Means and method for vapor generation

Abstract

A liquid, in heat transfer contact with a surface heated to a temperature well above the vaporization temperature of the liquid, will undergo a multiphase (liquid-vapor) transformation from 0% vapor to 100% vapor. During this transition, the temperature driving force or heat flux and the coefficients of heat transfer across the fluid-solid interface, and the vapor percentage influence the type of heating of the fluid - starting as feedwater heating where no vapors are present, progressing to nucleate heating where vaporization begins and some vapors are present, and concluding with film heating where only vapors are present. Unstable heating between nucleate and film heating can occur, accompanied by possibly large and rapid temperature shifts in the structures. This invention provides for injecting into the region of potential unstable heating and proximate the heated surface superheated vapors in sufficient quantities operable to rapidly increase the vapor percentage of the multiphase mixture by perhaps 10 to 30% and thereby effectively shift the multiphase mixture beyond the unstable heating region and up to the stable film heating region.

Inventors:
OSTI Identifier:
5303213
Application Number:
ON: DE84005994
Assignee:
EDB-84-030695
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; VAPOR GENERATORS; DESIGN; FILM BOILING; NUCLEATE BOILING; BOILERS; BOILING; PHASE TRANSFORMATIONS; 420400* - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Carlson, L.W. Means and method for vapor generation. United States: N. p., Web.
Carlson, L.W. Means and method for vapor generation. United States.
Carlson, L.W. . "Means and method for vapor generation". United States.
@article{osti_5303213,
title = {Means and method for vapor generation},
author = {Carlson, L.W.},
abstractNote = {A liquid, in heat transfer contact with a surface heated to a temperature well above the vaporization temperature of the liquid, will undergo a multiphase (liquid-vapor) transformation from 0% vapor to 100% vapor. During this transition, the temperature driving force or heat flux and the coefficients of heat transfer across the fluid-solid interface, and the vapor percentage influence the type of heating of the fluid - starting as feedwater heating where no vapors are present, progressing to nucleate heating where vaporization begins and some vapors are present, and concluding with film heating where only vapors are present. Unstable heating between nucleate and film heating can occur, accompanied by possibly large and rapid temperature shifts in the structures. This invention provides for injecting into the region of potential unstable heating and proximate the heated surface superheated vapors in sufficient quantities operable to rapidly increase the vapor percentage of the multiphase mixture by perhaps 10 to 30% and thereby effectively shift the multiphase mixture beyond the unstable heating region and up to the stable film heating region.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {},
month = {}
}