Title:
Experimental and Numerical Studies of Mist Cooling with Thin Evaporating Subcooled Liquid Films

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dc.contributor.advisor Abdel-Khalik, Said I.
dc.contributor.author Novak, Vladimir en_US
dc.contributor.committeeMember Daniel W. Tedder
dc.contributor.committeeMember Ghiaasiaan, S. Mostafa
dc.contributor.committeeMember Jeter, Sheldon M.
dc.contributor.committeeMember W. Russell Callen, Jr.
dc.contributor.department Mechanical Engineering en_US
dc.date.accessioned 2006-06-09T18:19:44Z
dc.date.available 2006-06-09T18:19:44Z
dc.date.issued 2006-04-11 en_US
dc.description.abstract An experimental and numerical investigation has been conducted to examine steady, internal, nozzle-generated, gas/liquid mist cooling in vertical channels with ultra-thin, evaporating subcooled liquid films. Interest in this research has been motivated by the need for a highly efficient cooling mechanism in high-power lasers for inertial fusion reactor applications. The aim is to quantify the effects of various operating and design parameters, viz. liquid atomization nozzle design (i.e. spray geometry, droplet size distribution, etc.), heat flux, liquid mass fraction, film thickness, carrier gas velocity, temperature, and humidity, injected liquid temperature, gas/liquid combinations, channel geometry, length, and wettability, and flow direction, on mist cooling effectiveness. A fully-instrumented experimental test facility has been designed and constructed. The facility includes three cylindrical and two rectangular electrically-heated test sections with different unheated entry lengths. Water is used as the mist liquid with air, or helium, as the carrier gas. Three types of mist generating nozzles with significantly different spray characteristics are used. Numerous experiments have been conducted; local heat transfer coefficients along the channels are obtained for a wide range of operating conditions. The data indicate that mist cooling can increase the heat transfer coefficient by more than an order of magnitude compared to forced convection using only the carrier gas. The data obtained in this investigation will allow designers of mist-cooled high heat flux engineering systems to predict their performance over a wide range of design and operating parameters. Comparison has been made between the data and predictions of a modified version of the KIVA-3V code, a mechanistic, three-dimensional computer program for internal, transient, dispersed two-phase flow applications. Good agreement has been obtained for downward mist flow at moderate heat fluxes; at high heat fluxes, the code underpredicts the local heat transfer coefficients and does not predict the onset of film rupture. For upward mist flow, the code underpredicts the local heat transfer coefficients and, contrary to experimental observations, predicts early dryout at the test section exit. en_US
dc.description.degree Ph.D. en_US
dc.format.extent 6926099 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/10528
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Wetability en_US
dc.subject Saturated liquid films cooling
dc.subject Subcooled liquid films cooling
dc.subject Enhancement ratio
dc.subject Heat transfer enhancement
dc.subject Ultra thin liquid films
dc.subject Evaporative cooling
dc.subject Two-phase forced convection
dc.subject Two-phase flow cooling
dc.subject Electra laser
dc.subject KRF lasers
dc.subject High average power lasers
dc.subject Spray mist cooling
dc.subject Nozzle generated mist cooling
dc.subject Dispersed flow
dc.subject.lcsh Nozzles Design and construction en_US
dc.subject.lcsh Lasers Cooling en_US
dc.subject.lcsh Fusion reactors Cooling en_US
dc.subject.lcsh Atomization en_US
dc.subject.lcsh Liquid films en_US
dc.title Experimental and Numerical Studies of Mist Cooling with Thin Evaporating Subcooled Liquid Films en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Abdel-Khalik, Said I.
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 196f5fb4-8c6b-4b41-add5-06b1d33b971c
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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