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Distribution of local heat transfer coefficient values in the wall region of an agitated vessel

Magdalena Cudak and Joanna Karcz

Department of Chemical Engineering, Szczecin University of Technology, Al. Piast√≥w 42, PL-71-065 Szczecin, Poland

 

E-mail: joanka@ps.pl

Received: 31 March 2007  Revised: 21 June 2007  Accepted: 5 July 2007

Abstract: Experimentally found local heat transfer coefficients are analyzed as a function of the measuring point on the heat transfer surface area of the agitated vessel wall and of the impeller eccentricity. Eccentric Rushton turbine and A 315 impeller are considered. Local heat transfer coefficients were measured by means of the computer-aided electrochemical method. The measurements were performed in an agitated vessel with inner diameter 0.3 m, filled with liquid up to the height equal to the vessel diameter. The experiments were carried out within the turbulent regime of the Newtonian liquid flow in the agitated vessel. The results were compared with the data obtained for the agitated vessel equipped with an eccentrically located axial flow propeller or an HE 3 impeller. Experimental studies show that the distributions of the heat transfer coefficient values depend on the impeller eccentricity, impeller type and the direction of the liquid circulation in the agitated vessel.

Keywords: agitation - local heat transfer - agitated vessel - eccentricity

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-007-0084-6

 

Chemical Papers 62 (1) 92–99 (2008)

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