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Title: Multi-scale Control and Enhancement of Reactor Boiling Heat Flux by Reagents and Nanoparticles

Abstract

The phenomenological characterization of the use of non-invasive and passive techniques to enhance the boiling heat transfer in water has been carried out in this extended study. It provides fundamental enhanced heat transfer data for nucleate boiling and discusses the associated physics with the aim of addressing future and next-generation reactor thermal-hydraulic management. It essentially addresses the hypothesis that in phase-change processes during boiling, the primary mechanisms can be related to the liquid-vapor interfacial tension and surface wetting at the solidliquid interface. These interfacial characteristics can be significantly altered and decoupled by introducing small quantities of additives in water, such as surface-active polymers, surfactants, and nanoparticles. The changes are fundamentally caused at a molecular-scale by the relative bulk molecular dynamics and adsorption-desorption of the additive at the liquid-vapor interface, and its physisorption and electrokinetics at the liquid-solid interface. At the micro-scale, the transient transport mechanisms at the solid-liquid-vapor interface during nucleation and bubblegrowth can be attributed to thin-film spreading, surface-micro-cavity activation, and micro-layer evaporation. Furthermore at the macro-scale, the heat transport is in turn governed by the bubble growth and distribution, macro-layer heat transfer, bubble dynamics (bubble coalescence, collapse, break-up, and translation), and liquid rheology. Some of these behaviors andmore » processes are measured and characterized in this study, the outcomes of which advance the concomitant fundamental physics, as well as provide insights for developing control strategies for the molecular-scale manipulation of interfacial tension and surface wetting in boiling by means of polymeric reagents, surfactants, and other soluble surface-active additives.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Univ. of Cincinnati, OH (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1024386
Report Number(s):
DOE/ID/14772
TRN: US201119%%347
DOE Contract Number:  
FG07-07ID14772
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; ADDITIVES; BOILING; BUBBLE GROWTH; BUBBLES; COALESCENCE; ELECTRODYNAMICS; EVAPORATION; HEAT FLUX; HEAT TRANSFER; HYPOTHESIS; MANAGEMENT; NUCLEATE BOILING; NUCLEATION; PHYSICS; POLYMERS; RHEOLOGY; SURFACTANTS; TRANSIENTS; TRANSPORT; WATER

Citation Formats

Manglik, R M, Athavale, A, Kalaikadal, D S, Deodhar, A, and Verma, U. Multi-scale Control and Enhancement of Reactor Boiling Heat Flux by Reagents and Nanoparticles. United States: N. p., 2011. Web. doi:10.2172/1024386.
Manglik, R M, Athavale, A, Kalaikadal, D S, Deodhar, A, & Verma, U. Multi-scale Control and Enhancement of Reactor Boiling Heat Flux by Reagents and Nanoparticles. United States. https://doi.org/10.2172/1024386
Manglik, R M, Athavale, A, Kalaikadal, D S, Deodhar, A, and Verma, U. 2011. "Multi-scale Control and Enhancement of Reactor Boiling Heat Flux by Reagents and Nanoparticles". United States. https://doi.org/10.2172/1024386. https://www.osti.gov/servlets/purl/1024386.
@article{osti_1024386,
title = {Multi-scale Control and Enhancement of Reactor Boiling Heat Flux by Reagents and Nanoparticles},
author = {Manglik, R M and Athavale, A and Kalaikadal, D S and Deodhar, A and Verma, U},
abstractNote = {The phenomenological characterization of the use of non-invasive and passive techniques to enhance the boiling heat transfer in water has been carried out in this extended study. It provides fundamental enhanced heat transfer data for nucleate boiling and discusses the associated physics with the aim of addressing future and next-generation reactor thermal-hydraulic management. It essentially addresses the hypothesis that in phase-change processes during boiling, the primary mechanisms can be related to the liquid-vapor interfacial tension and surface wetting at the solidliquid interface. These interfacial characteristics can be significantly altered and decoupled by introducing small quantities of additives in water, such as surface-active polymers, surfactants, and nanoparticles. The changes are fundamentally caused at a molecular-scale by the relative bulk molecular dynamics and adsorption-desorption of the additive at the liquid-vapor interface, and its physisorption and electrokinetics at the liquid-solid interface. At the micro-scale, the transient transport mechanisms at the solid-liquid-vapor interface during nucleation and bubblegrowth can be attributed to thin-film spreading, surface-micro-cavity activation, and micro-layer evaporation. Furthermore at the macro-scale, the heat transport is in turn governed by the bubble growth and distribution, macro-layer heat transfer, bubble dynamics (bubble coalescence, collapse, break-up, and translation), and liquid rheology. Some of these behaviors and processes are measured and characterized in this study, the outcomes of which advance the concomitant fundamental physics, as well as provide insights for developing control strategies for the molecular-scale manipulation of interfacial tension and surface wetting in boiling by means of polymeric reagents, surfactants, and other soluble surface-active additives.},
doi = {10.2172/1024386},
url = {https://www.osti.gov/biblio/1024386}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 02 00:00:00 EDT 2011},
month = {Fri Sep 02 00:00:00 EDT 2011}
}