A fundamental study of spray evaporative cooling

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dc.contributor.advisorWierum, Frederic A.en_US
dc.contributor.committeeMemberChapman, Alan J.en_US
dc.contributor.committeeMemberBayazitoglu, Yildizen_US
dc.creatorGrissom, William M.en_US
dc.date.accessioned2018-12-18T21:32:26Zen_US
dc.date.available2018-12-18T21:32:26Zen_US
dc.date.issued1979en_US
dc.description.abstract"Spray evaporative cooling" is defined as the mode of spray cooling heat transfer for which no liquid film would form on a heated surface of infinite extent. The heat flux during this mode is simply that required to vaporize all of the impinging spray. The lower surface temperature range limit for the existence of spray evaporative cooling is determined experimentally to be an essentially linear function of the impinging spray mass flux. This suggests a conduction-controlled droplet evaporation mechanism. An analytical model of this form gives fairly good agreement with the experimental measurements at atmospheric pressure. The effect of lowering the surrounding pressure appears to be a decreased "wettability" of the liquid (distilled water) upon the aluminum surface. This would account for the correspondingly lower droplet evaporation times observed. "Spray film cooling" is defined as the mode of spray cooling heat transfer for which a liquid film would exist upon the heated surface. An analysis of this mode is of importance in determining several characteristics of the spray evaporative cooling mode. At atmospheric pressure the mechanism governing spray film cooling appears to be quite similar to that of ordinary pool boiling with little or no dependence upon the liquid film thickness. At vacuum pressures spray film cooling appears to be governed by the simple mechanism of heat conduction through the liquid film, and very much dependent upon the liquid film thickness. The "Leidenfrost State" is defined as the mode in which impinging droplets rebound off of the surface. The initiation of the Leidenfrost state imposes: the upper range limit for the existence of spray evaporative cooling. The surface temperature at which this state is initiated is found to be very much a function of the surrounding pressure. Interestingly, this variation with pressure is such that it counteracts the variation of the lower range limit with pressure, resulting in essentially the same maximum possible heat flux during spray evaporative cooling for all surrounding pressures.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent90 ppen_US
dc.identifier.callnoTHESIS M.E. 1979 GRISSOMen_US
dc.identifier.citationGrissom, William M.. "A fundamental study of spray evaporative cooling." (1979) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104818">https://hdl.handle.net/1911/104818</a>.en_US
dc.identifier.digitalRICE2458en_US
dc.identifier.urihttps://hdl.handle.net/1911/104818en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleA fundamental study of spray evaporative coolingen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentMechanical Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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