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Heat transfer to liquids and suspensions in agitated narrow vessels
Author(s) -
Frobese DirkHans,
Bohnet Matthias
Publication year - 1989
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270120145
Subject(s) - heat transfer coefficient , heat transfer , grashof number , reynolds number , thermodynamics , volume (thermodynamics) , impeller , chemistry , suspension (topology) , film temperature , churchill–bernstein equation , mechanics , materials science , nusselt number , turbulence , physics , mathematics , homotopy , pure mathematics
The knowledge of the heat transfer coefficient on the inner side of a heated vessel wall is of the utmost importance for the design of agitated vessels. In the case of large Reynolds numbers, the heat transfer is mainly determined by these numbers whereas, with small Reynolds numbers, the heat transfer is better described by considering the Grashof number. Investigations of heat transfer in agitated narrow vessels have shown that the height/diameter ratio exerts virtually no influence on the heat transfer when multi‐impeller stirrers are used. The heat transfer to stirred suspensions can be described by relationships valid for liquids if the characteristic data of the liquid are replaced by those of the suspension and when the solids volume concentration is also taken into account. This relationship allows the heat transfer coefficient to be calculated for given solids volume concentrations of up to 60%.