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Title: Experimental investigation of direct contact three phase boiling heat transfer

Abstract

The system which was studied in the present work consisted of one liquid undergoing vaporization by contact with a hotter immiscible liquid. The liquids and vapor were contacted in a counterflow spray column with only differential increases in vapor quality. Experiments yielded vertical temperature profiles, flow rates of the phases, liquid holdups, pressure drops, and a characterization of flow patterns. A micro-computer was utilized for measuring temperatures in the column at the rate of 1500 to 1600 times per second at several depths. Analysis of the experimental data indicate that the maximum temperature difference between the phases is 0.5F/sup 0/, and that a temperature crossover occurs at the lower end of the column. The heat transfer fluid undergoes flash vaporization at its inlet at the top of the column, and much of its sensible heat is tranferred to the dispersed phase near the top of the column. Temperature profiles along the length of the boiler are nearly flat, and very little heat transfer occurs in the lower part of the boiler. A chemical method was developed for measuring effective interfacial area in a direct contact boiler. The theoretical basis of the method is discussed, and physico-chemical data necessary for applicationmore » of the technique are reported. Water solubility of methyl salicylate was measured as a function of temperature, and the second order reaction rate coefficient for saponification of methyl salicylate by sodium hydroxide was determined from sodium hydroxide concentration versus time data and a computer model of a well-mixed semibatch reactor. The activation energy for the reaction was found to be 9.58 kilocalories per gram mole.« less

Authors:
Publication Date:
Research Org.:
Tennessee Univ., Knoxville (USA)
OSTI Identifier:
6223376
Alternate Identifier(s):
OSTI ID: 6223376
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; MULTIPHASE FLOW; HEAT TRANSFER; DATA PROCESSING; EXPERIMENTAL DATA; LIQUIDS; METHYL RADICALS; TEMPERATURE DEPENDENCE; VAPORS; ALKYL RADICALS; DATA; ENERGY TRANSFER; FLUID FLOW; FLUIDS; GASES; INFORMATION; NUMERICAL DATA; PROCESSING; RADICALS 420400* -- Engineering-- Heat Transfer & Fluid Flow

Citation Formats

Bruce, W.D. Experimental investigation of direct contact three phase boiling heat transfer. United States: N. p., 1981. Web.
Bruce, W.D. Experimental investigation of direct contact three phase boiling heat transfer. United States.
Bruce, W.D. Thu . "Experimental investigation of direct contact three phase boiling heat transfer". United States. doi:.
@article{osti_6223376,
title = {Experimental investigation of direct contact three phase boiling heat transfer},
author = {Bruce, W.D.},
abstractNote = {The system which was studied in the present work consisted of one liquid undergoing vaporization by contact with a hotter immiscible liquid. The liquids and vapor were contacted in a counterflow spray column with only differential increases in vapor quality. Experiments yielded vertical temperature profiles, flow rates of the phases, liquid holdups, pressure drops, and a characterization of flow patterns. A micro-computer was utilized for measuring temperatures in the column at the rate of 1500 to 1600 times per second at several depths. Analysis of the experimental data indicate that the maximum temperature difference between the phases is 0.5F/sup 0/, and that a temperature crossover occurs at the lower end of the column. The heat transfer fluid undergoes flash vaporization at its inlet at the top of the column, and much of its sensible heat is tranferred to the dispersed phase near the top of the column. Temperature profiles along the length of the boiler are nearly flat, and very little heat transfer occurs in the lower part of the boiler. A chemical method was developed for measuring effective interfacial area in a direct contact boiler. The theoretical basis of the method is discussed, and physico-chemical data necessary for application of the technique are reported. Water solubility of methyl salicylate was measured as a function of temperature, and the second order reaction rate coefficient for saponification of methyl salicylate by sodium hydroxide was determined from sodium hydroxide concentration versus time data and a computer model of a well-mixed semibatch reactor. The activation energy for the reaction was found to be 9.58 kilocalories per gram mole.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1981},
month = {Thu Jan 01 00:00:00 EST 1981}
}

Thesis/Dissertation:
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  • The nucleate boiling heat-transfer coefficient and the maximum heat flux were studied experimentally as functions of velocity, quality and heater diameter for single-phase flow, and two-phase flow of Freon-113 (trichlorotrifluorethane). Results show: (1) peak heat flux: over 300 measured peak heat flux data from two 0.875-in. and four 0.625-in.-diameter heaters indicated that: (a) for pool boiling, single-phase and two-phase forced convection boiling the only parameter (among hysteresis, rate of power increase, aging, presence and proximity of unheated rods) that has a statistically significant effect on the peak heat flux is the velocity. (b) In the velocity range (0 < U/submore » infinity/ < 0.68 ft/sec) covered in this study the peak heat flux appears to exhibit a shallow minimum in the vicinity of U/sub infinity/ - 0.4 ft/sec. (c) The two-phase flow peak heat flux is 8 to 15% higher than the single-phase flow peak heat flux and the increase is independent of the quality of the flowing mixture. (d) For simultaneously heated elements at identical power inputs the excursion into film boiling always occurs at the most upstream heater regardless of the flow conditions. (2) Boiling pattern: single-phase forced convection drastically reduces the thickness of the two-phase zone surrounding the heater. (3) Local surface temperature: the coldest and the hottest spots of the heater are identified as the bottom (0/sup 0/ position or the point of impact of the incident fluid) and the top (180/sup 0/ position) of the test element, respectively.« less
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