Heat transfer to cooling coil acting as rotating impeller in highly viscous liquids
30 Jun 1972-Journal of Chemical Engineering of Japan (The Society of Chemical Engineers, Japan)-Vol. 5, Iss: 2, pp 187-192
TL;DR: In this article, heat transfer coefficients from a jacket wall (hj) and to a rotating coil impeller (hc) were studied in highly viscous non-Newtonian liquids.
Abstract: Heat transfer coefficients from a jacket wall (hj) and to a rotating coil impeller (hc) were studied in highly viscous non-Newtonian liquids. Correlated equations were determined for both hj and hc in laminar and turbulent regions. It was observed that hc was almost three times as large as hj. An explanationis presented for this phenomenon.
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TL;DR: A review of heat transfer to Newtonian fluids and an air-water system in mechanically agitated vessels is divided into three sections based on the type of heat-transfer surface considered: jackets, coils, and other surfaces such as baffles as discussed by the authors.
46 citations
TL;DR: In this paper, an empirical correlation is developed to predict the heat transfer coefficient for the specified operating conditions, which includes the influence of the H/T ratio on heat transfer coefficients, which has not been studied so far.
20 citations
TL;DR: In this article, a methodology to obtain a Nusselt correlation for stirred tank reactors is presented, which is based on the use of a validated computational model to obtain the heat-transfer coefficients.
Abstract: A methodology to obtain a Nusselt correlation for stirred tank reactors is presented. The novelty of the approach is the use of a validated computational model to obtain the heat-transfer coefficients. The advantages of this new approach are many, including the possibility of testing different heat-transfer configurations to obtain their Nusselt correlation without performing experimental runs. Physical phenomena involved was represented both qualitatively and quantitatively. The classical experimental work of (Oldshue and Gretton, Chem Eng Prog. 1954;50(12):615–621) illustrates the procedure. A sufficient number of virtual points in the whole range of the Reynolds number should be obtained. Results strongly depend on mesh refinement in the boundary layer, so a procedure is suggested to guarantee heat-transfer coefficients are accurately estimated. The final Nusselt correlation was compared against all the 107 experimental points of the work by (Oldshue and Gretton, Chem Eng Prog. 1954;50(12):615–621), and an average deviation on the results of 10.7%. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3912–3924, 2017
9 citations
Dissertation•
10 Nov 2006
TL;DR: The authors concerne un nouveau procede de vitrification a l'etude au CEA de Marcoule depuis ces vingt dernieres annees.
Abstract: Ce travail de recherche concerne un nouveau procede de vitrification a l'etude au CEA de Marcoule depuis ces vingt dernieres annees. Ce procede, base sur l'induction directe en creuset froid, est utilise pour le traitement des dechets nucleaires de haute activite. Il se caracterise par le refroidissement des structures metalliques par circulation d'eau et l'induction directe de courants electriques dans la charge de verre en fusion. Un dispositif d'agitation mecanique permet une homogeneisation du bain de verre fondu. Lors de cette etude, les phenomenes thermiques, hydrodynamiques et electromagnetiques ont ete consideres. Une attention particuliere est portee sur la modelisation de l'agitation mecanique et la mise en place d'une strategie de couplage entre les trois phenomenes. La validation de la modelisation a pu etre realisee a partir des resultats experimentaux acquis sur les pilotes de vitrification.
9 citations
Cites background from "Heat transfer to cooling coil actin..."
...Une analyse dimensionnelle (Nagata (1975)) met en évidence que la relation (IV....
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...Dans le cas de mobiles en rotation, le nombre de Reynolds couramment utilisé (voir Nagata (1975)) est donné par (II....
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