On Flow Fields in Tubular Heat Exchangers – Numerical Calculations and Flow Visualization
| Autor: | Manfred Fallen, Tatiana Savtchenko, Fritz Ebert |
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| Rok vydání: | 2001 |
| Předmět: |
Flow visualization
Engineering Dynamic scraped surface heat exchanger business.industry General Chemical Engineering Thermodynamics General Chemistry Mechanics Industrial and Manufacturing Engineering Volumetric flow rate Physics::Fluid Dynamics Flow separation Bundle Heat exchanger Heat transfer Micro heat exchanger business |
| Zdroj: | Chemical Engineering & Technology. 24:706-711 |
| ISSN: | 1521-4125 0930-7516 |
| DOI: | 10.1002/1521-4125(200107)24:7<706::aid-ceat706>3.0.co;2-p |
| Popis: | Tubular heat exchangers belong to heat equipment, which is frequently used in industry. During their design it is usually assumed that nearly the same velocity prevails in all pipes of a bundle. Because of the abrupt changes of cross section in the inlet chamber the fluid cannot follow the chamber contour and flow separation occurs. Vortices are formed in the inlet chamber, which lead to different flow rates into the tube bundle. A method for the hydrodynamic optimization of tubular heat exchangers is represented within the framework of this work, which consists of measurements on a real tubular heat exchanger, visualization of the flow field in a water channel and numerical calculations with CFD programs. It will be shown what velocity profile appears in a bundle of pipes, and which parameters have an influence on it. Using the results obtained on the distribution of the flow medium, it is possible to estimate the effect of the nonhomogeneity on heat transfer, dissipation and fouling. |
| Databáze: | OpenAIRE |
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