TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Experimental Study Regarding Heat Transfer through Direct Contact between Immiscible Liquids
(Chemical and Petrochemical Engineering Department, University of Petroleum-Gas Ploiesti, Bucuresti Bvd, No 39, Ploiesti; e-mail: lorido01@yahoo.com)
Vol LX • No. 4/2008
Loredana Irena Negoiţă
Chemical and Petrochemical Engineering Department, University of Petroleum-Gas Ploiesti,
Bucuresti Bvd, No 39, Ploiesti;
e-mail: lorido01@yahoo.com

 Keywords   heat transfer, immiscible liquid, coefficient of global heat transfer, flow rate, the continue phase

 Abstract
The subject of the present paper is the experimental study of heat transfer through direct contact between three warm liquid petroleum fractions, warm toluene, and cold water. Contact between two immiscible liquids has been made by dispersing drops of either warm liquid petroleum fraction, toluene, in the cold water that represented the continue phase.
Access and exit measurements have been made for each of the liquids brought in direct contact, their flow capacities, the frequency of the formed drops and the amount of time necessary for a drop to reach the contact layer.
The measurements made were necessary for calculating the changed thermal fluxes at the level of each system formed of two immiscible liquids, of toluene or petroleum fraction drop diameter that goes through the layer of water, of heat transfer area between the drops of warm petroleum fraction or toluene and cold water and of global heat transfer coefficient between the drops of warm petroleum fraction or toluene and cold water. These results were correlated while taking into account the influence of physic features of the two immiscible liquids put in direct contact and four criteria relations that shape the heat transfer between the immiscible liquids were obtained.

 Rezumat
Īn lucrarea de faţă s-a studiat experimental schimbul de căldură prin contact direct īntre trei fracţiuni petroliere lichide calde, toluen cald şi apă rece. Contactarea a două lichide practic nemiscibile s-a făcut prin dispersarea īn picături fie a fracţiunilor petroliere lichide calde, fie a toluenului, īn apa rece care a constituit faza continuă.
Măsurătorile efectuate referitoare la debitul lichidului dispersat, frecvenţa şi viteza de deplasare a picăturilor īn lichidul fază continuă au fost folosite pentru calcularea fluxurilor termice schimbate la nivelul fiecărui sistem format din două lichide practic nemiscibile, a diametrului picăturii de fracţiune petrolieră sau toluen ce traversează stratul de apă, a ariei de transfer de căldură īntre picăturile de fracţiune petrolieră caldă sau toluen şi apa rece, şi a coeficientul global de transfer de căldură īntre picăturile de fracţiune petrolieră caldă sau toluen şi apa rece.
Rezultatele experimentale au fost prelucrate prin metoda regresiei multiple, rezultānd patru relaţii criteriale care modelează schimbul de căldură īntre lichidele practic nemiscibile alese.



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