Heat and mass transfer effects of ice growth mechanisms in pure water and aqueous solutions

Simple item page
dc.contributor.authorKapembwa, Michael
dc.contributor.authorRodriguez-Pascual, Marcos
dc.contributor.authorLewis, Alison Emslie
dc.date.accessioned2015-06-19T07:24:47Z
dc.date.available2015-06-19T07:24:47Z
dc.date.issued2014
dc.description.abstractInteractions between heat and mass diffusion determine growth mechanisms during ice crystallization. The effects of heat and mass transfer on ice growth in pure water and magnesium sulfate solution were investigated by studying the evolution of the gradient of the refractive index using color Schlieren deflectometry. For pure water, the gradient of the refractive index of water was used to calculate the temperature and therefore the local supersaturation. Its effect on the ice crystal growth rate and morphology was studied. It was found that, for local supersaturations greater than 2.8, the morphology was dendritic ice, with a growth rate 2 orders of magnitude higher than that for layered growth. During dendritic growth, 3−16% of the heat of crystallization diffused to the liquid side, which is counter to current understanding. At the transition (between the time of partial melting of the dendritic ice and the beginning of the layered ice growth), a higher supersaturation than that responsible for layered growth was observed. For ice growth from an aqueous salt solution, a mass and thermal diffusion boundary layer in front of the growing ice was created by diffusion of the solutes from the ice and by the release of heat of crystallization.en_ZA
dc.identifier.apacitationKapembwa, M., Rodriguez-Pascual, M., & Lewis, A. E. (2014). Heat and mass transfer effects of ice growth mechanisms in pure water and aqueous solutions. <i>Crystal Growth and Design</i>, http://hdl.handle.net/11427/13086en_ZA
dc.identifier.chicagocitationKapembwa, Michael, Marcos Rodriguez-Pascual, and Alison Emslie Lewis "Heat and mass transfer effects of ice growth mechanisms in pure water and aqueous solutions." <i>Crystal Growth and Design</i> (2014) http://hdl.handle.net/11427/13086en_ZA
dc.identifier.citationKapembwa, M., Rodroguez-Pascual, M. and Lewis, A.E. (2014). Heat and mass transfer effects of ice growth mechanisms in pure water and aqueous solutions, Crystal Growth and Design, 14: 389-395en_ZA
dc.identifier.issn1528-7483en_ZA
dc.identifier.ris TY - Journal Article AU - Kapembwa, Michael AU - Rodriguez-Pascual, Marcos AU - Lewis, Alison Emslie AB - Interactions between heat and mass diffusion determine growth mechanisms during ice crystallization. The effects of heat and mass transfer on ice growth in pure water and magnesium sulfate solution were investigated by studying the evolution of the gradient of the refractive index using color Schlieren deflectometry. For pure water, the gradient of the refractive index of water was used to calculate the temperature and therefore the local supersaturation. Its effect on the ice crystal growth rate and morphology was studied. It was found that, for local supersaturations greater than 2.8, the morphology was dendritic ice, with a growth rate 2 orders of magnitude higher than that for layered growth. During dendritic growth, 3−16% of the heat of crystallization diffused to the liquid side, which is counter to current understanding. At the transition (between the time of partial melting of the dendritic ice and the beginning of the layered ice growth), a higher supersaturation than that responsible for layered growth was observed. For ice growth from an aqueous salt solution, a mass and thermal diffusion boundary layer in front of the growing ice was created by diffusion of the solutes from the ice and by the release of heat of crystallization. DA - 2014 DB - OpenUCT DO - 10.1021/cg401428v DP - University of Cape Town J1 - Crystal Growth and Design LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 SM - 1528-7483 T1 - Heat and mass transfer effects of ice growth mechanisms in pure water and aqueous solutions TI - Heat and mass transfer effects of ice growth mechanisms in pure water and aqueous solutions UR - http://hdl.handle.net/11427/13086 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/13086
dc.identifier.urihttp://dx.doi.org/10.1021/cg401428v
dc.identifier.vancouvercitationKapembwa M, Rodriguez-Pascual M, Lewis AE. Heat and mass transfer effects of ice growth mechanisms in pure water and aqueous solutions. Crystal Growth and Design. 2014; http://hdl.handle.net/11427/13086.en_ZA
dc.languageengen_ZA
dc.publisherAmerican Chemical Societyen_ZA
dc.publisher.departmentCrystallisation and Precipitation Researchen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.sourceCrystal Growth and Designen_ZA
dc.source.urihttp://pubs.acs.org/journal/cgdefu
dc.titleHeat and mass transfer effects of ice growth mechanisms in pure water and aqueous solutionsen_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.72 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles