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- W406623656 abstract "During tliis project tlie transfer of heat to a laminar flow inside a Primix static mixer has been investigated, using both experimental measurements and numerical simulations. This has been done for a high Prandtl number fiuid, in this case mineral oil. The Reynolds number of the flow in tlie mixer was between 7 and 18, while the Prandtl number of the fluid varied between 3200 and 5500. An experimental setup was designed and built using a heating circuit fliled with water and a separate circuit containing the oil. The temperature was measured at several positions inside and outside the mixer using PtlOO sensors. The measurements inside the mixer showed a strong dependency on the insertion depth of the sensors, a procedure to correct the measurements was developed. Because of the thin thermal boundary layers in the flow, special attention was given in the numerical simulations to the fluid layer close to the metal parts. Different options for modeUing this boundary layer were investigated, as well as the grid dependency of the results. The results of the simulations depend strongly on the boundary layer, while the bulk of the fluid can be modelled with a relatively coarse grid. The simulations predict the heat transfer of the mixer accurately, and can be used to further investigate the influence of design changes on heat transfer. Two mixers have been used: in one the mixing elements have been soldered to the wall, improving the conduction of heat from the outside to the mixing elements. In the second mixer the elements form a string which is inserted in the tube. A theoretical model has been developed to estimate the performance difference between both mixers for laminar flows. The experimental results agree with the theoretical model, while the simulations seem to result in a constant performance difference." @default.
- W406623656 created "2016-06-24" @default.
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- W406623656 date "2004-05-01" @default.
- W406623656 modified "2023-09-24" @default.
- W406623656 title "Measurements and simulations of heat transfer in a Primix static mixer" @default.
- W406623656 hasPublicationYear "2004" @default.
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