Effects of polymer additives in the bulk of turbulent thermal convection
Identifieur interne : 000051 ( Main/Exploration ); précédent : 000050; suivant : 000052Effects of polymer additives in the bulk of turbulent thermal convection
Auteurs : Yi-Chao Xie [République populaire de Chine] ; Shi-Di Huang [République populaire de Chine] ; Denis Funfschilling [France] ; Xiao-Ming Li [République populaire de Chine] ; Rui Ni [République populaire de Chine] ; Ke-Qing Xia [République populaire de Chine]Source :
- Journal of Fluid Mechanics [ 0022-1120 ] ; 2015-12.
Abstract
We present experimental evidence that a minute amount of polymer additives can significantly enhance heat transport in the bulk region of turbulent thermal convection. The effects of polymer additives are found to be the enhancement of coherent heat fluxes and suppression of incoherent heat fluxes. The enhanced heat transport is associated with the increased coherency of thermal plumes, as a result of the suppression of small-scale turbulent fluctuations by polymers. The incoherent heat flux, arising from turbulent background fluctuations, makes no net contribution to heat transport. The fact that polymer additives can increase the coherency of thermal plumes is supported by the measurements of a number of local quantities, such as the extracted plume amplitude and width, the velocity autocorrelation functions and the velocity temperature cross-correlation coefficient. The results from local measurements also suggest the existence of a threshold value for the polymer concentration, only above which significant modification of the plume coherent properties and enhancement of the local heat flux can be observed. Estimation of the plume emission rate suggests a stabilization of the thermal boundary layer by polymer additives.
Url:
DOI: 10.1017/jfm.2015.618
Affiliations:
- France, République populaire de Chine
- Grand Est, Lorraine (région)
- Metz, Nancy
- Université de Lorraine
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The effects of polymer additives are found to be the enhancement of coherent heat fluxes and suppression of incoherent heat fluxes. The enhanced heat transport is associated with the increased coherency of thermal plumes, as a result of the suppression of small-scale turbulent fluctuations by polymers. The incoherent heat flux, arising from turbulent background fluctuations, makes no net contribution to heat transport. The fact that polymer additives can increase the coherency of thermal plumes is supported by the measurements of a number of local quantities, such as the extracted plume amplitude and width, the velocity autocorrelation functions and the velocity temperature cross-correlation coefficient. The results from local measurements also suggest the existence of a threshold value for the polymer concentration, only above which significant modification of the plume coherent properties and enhancement of the local heat flux can be observed. Estimation of the plume emission rate suggests a stabilization of the thermal boundary layer by polymer additives.</div></front></TEI><affiliations><list><country><li>France</li><li>République populaire de Chine</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Metz</li><li>Nancy</li></settlement><orgName><li>Université de Lorraine</li></orgName></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Xie, Yi Chao" sort="Xie, Yi Chao" uniqKey="Xie Y" first="Yi-Chao" last="Xie">Yi-Chao Xie</name></noRegion><name sortKey="Huang, Shi Di" sort="Huang, Shi Di" uniqKey="Huang S" first="Shi-Di" last="Huang">Shi-Di Huang</name><name sortKey="Li, Xiao Ming" sort="Li, Xiao Ming" uniqKey="Li X" first="Xiao-Ming" last="Li">Xiao-Ming Li</name><name sortKey="Ni, Rui" sort="Ni, Rui" uniqKey="Ni R" first="Rui" last="Ni">Rui Ni</name><name sortKey="Xia, Ke Qing" sort="Xia, Ke Qing" uniqKey="Xia K" first="Ke-Qing" last="Xia">Ke-Qing Xia</name></country><country name="France"><region name="Grand Est"><name sortKey="Funfschilling, Denis" sort="Funfschilling, Denis" uniqKey="Funfschilling D" first="Denis" last="Funfschilling">Denis Funfschilling</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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