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Titolo:
Drop formation from flat tip nozzles in liquid-liquid system
Autore:
Chen, CT; Maa, JR; Yang, YM; Chang, CH;
Indirizzi:
Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan Natl Cheng KungUniv Tainan Taiwan 70101 Chem Engn, Tainan 70101, Taiwan
Titolo Testata:
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
fascicolo: 5, volume: 28, anno: 2001,
pagine: 681 - 692
SICI:
0735-1933(200107)28:5<681:DFFFTN>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
2-PHASE NOZZLE; PART;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Maa, JR Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan Natl Cheng Kung Univ Tainan Taiwan 70101 n, Tainan 70101, Taiwan
Citazione:
C.T. Chen et al., "Drop formation from flat tip nozzles in liquid-liquid system", INT COMM HE, 28(5), 2001, pp. 681-692

Abstract

Correct estimation of interfacial area for heat or mass transfer is of primary importance in liquid-liquid contacting systems. But the existing correlations for the estimation of the sizes of drops formed by nozzles at low flow rate are based on experimental data using nozzles with tips filed down to sharp or bevel or a very thin thickness, and the inside diameters are used as the characteristic diameters. These correlations would underestimate the size of aqueous drops formed from flat tip metallic nozzles considerably, because as the drops are detached from the nozzle tips, the liquid-liquid-solid contact lines are not just located at the inside edge of the opening. In this work, the formation of drops of aqueous., from flat tip stainless steel nozzles of various dimensions into solutions of NaCl and AlCl3 fromflat tip stainless steel nozzles of various dimensions into a pool of n-dodecane was studied experimentally. It was found that the deviation of the estimated drop sizes by the correlation of Kagan et al. differs only slightly from that of Scheele and Meister. The deviations of the estimated values are not affected by the dissolved salts within the range of concentrations studied. And most importantly, the mean deviation of the correlation of Scheele and Meister can be reduced to a few percents if different characteristic diameters, d(n), are used in the computation: d(n)=O.D. for the cases ofrelatively large nozzles of about 1 cm O.D. with wall thickness between 0.098 and 0.170cm; d(n)=1.15xO.D. for small thin wall nozzles of O.D. < 0.35cm with wall thickness <0.036cm. (C) 2001 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 12:57:59