doi: 10.15255/CABEQ.2018.1392

Published: CABEQ 32 (3) (2018) 335-347
Paper type: Original Scientific Paper

Download PDF

Experimental Modelling of Local Heat Transfer Process for a Gas-liquid System in an Agitated Vessel with the System of A 315 – RT Impellers

I. Bielka, M. Cudak and J. Karcz

Abstract
The results of the experimental studies of the local heat transfer process for a gas-liquid system in the region of the cylindrical wall of baffled agitated vessel equipped with the system of A 315 (lower) – RT (upper) impellers are presented. Newtonian liquids of different physical properties and air were used as continuous and dispersed phases, respectively. Local heat transfer coefficients were measured using both thermal and electrochemical methods. Distributions of the heat transfer coefficients were described by means of equations (13) – (16) and (17) – (21), separately, for turbulent and transitional ranges of the fluid flow in the agitated vessel. These equations, concerning both coalescing and non-coalescing gas-liquid systems, have no equivalent in the open literature. Moreover, the results for the A 315 – RT impeller system were compared with our previous heat transfer data obtained using CD 6 – RT or RT – RT impeller systems.

Keywords
agitation, gas-liquid system, local heat transfer, system of A 315 – RT impellers