TY - JOUR
T1 - Non-isothermal mixing of rheologically complex fluids with close-clearance impellers
T2 - Effect of natural convection
AU - Brito-De La Fuente, Edmundo
AU - Nuñez, M. C.
AU - Tanguy, P. A.
PY - 1997/4
Y1 - 1997/4
N2 - Transient heat transfer in a mechanically agitated vessel is studied in the case of an anchor and an helical ribbon impeller using Newtonian and shear thinning fluids. Temperature stratification is found more pronounced with the anchor, making this impeller clearly inadequate for heat transfer. The impact of natural convection is evaluated first using the classical Gr/Re2 ratio. It is shown that the use of this criterion in viscous mixing is somewhat misleading. A new Grashof number is then proposed to assess the significance of the viscous and buoyancy effects in non-isothermal, non-Newtonian mixing applications. It is shown that the interpretation of this new number is strongly related to the concept of process viscosity.
AB - Transient heat transfer in a mechanically agitated vessel is studied in the case of an anchor and an helical ribbon impeller using Newtonian and shear thinning fluids. Temperature stratification is found more pronounced with the anchor, making this impeller clearly inadequate for heat transfer. The impact of natural convection is evaluated first using the classical Gr/Re2 ratio. It is shown that the use of this criterion in viscous mixing is somewhat misleading. A new Grashof number is then proposed to assess the significance of the viscous and buoyancy effects in non-isothermal, non-Newtonian mixing applications. It is shown that the interpretation of this new number is strongly related to the concept of process viscosity.
UR - http://www.scopus.com/inward/record.url?scp=0031126601&partnerID=8YFLogxK
U2 - 10.1002/ceat.270200308
DO - 10.1002/ceat.270200308
M3 - Artículo
SN - 0930-7516
VL - 20
SP - 203
EP - 207
JO - Chemical Engineering and Technology
JF - Chemical Engineering and Technology
IS - 3
ER -