ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Heat transfer in a jacketed agitated vessel equipped with multistage impellers

Marcela Věříšová, Martin Dostál, Tomáš Jirout, and Karel Petera

Department of Process Engineering, Faculty of Mechanical Engineering, Czech Technical University in Prague, Technická, 166 07 Prague 6, Czech Republic

E-mail: Marcela.Verisova@fs.cvut.cz

Abstract: In this work, heat transfer via the cylindrical part of the jacket in an agitated vessel has been investigated. Heat transfer coefficients were determined using the transient method based on measuring the temperature dependency of the liquid batch on time. A multistage impeller made of two impellers was used in a cylindrical vessel with dished bottom. The lower impeller was a curved blade turbine with the diameter of d = 100 mm and the upper impeller was either a pitched three-blade or pitched four-blade impeller with the diameter of d₁ = 67 mm. Three different impeller clearances in a multistage configuration, H₃/d₁ = 1, 1.5, and 2, were used in our measurements. The vessel was equipped with two baffles. Experimental results were evaluated using the Euler’s method and nonlinear regression procedure in the Matlab^® software and they are summarized in form of Nusselt number correlations describing their dependency on the Reynolds number.

Keywords: heat transfer – jacketed agitated vessel – multistage impellers

Full paper is available at www.springerlink.com.

DOI: 10.1515/chempap-2015-0080

Chemical Papers 69 (5) 690–697 (2015)