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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Deformation and damage of tube bundle bends due to temperature
 Michálková, Anežka ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
This master’s thesis deals with the problem of determining the thermal load of cross-flow tube bundle bends in steam superheater. Firstly, the theoretical basis of computational fluid dynamics and finite element method is introduced, and the possible methods of creep damage evaluation are presented as it was assumed that creep damage would be the most significant damage mechanism. The next part of this thesis describes simulations in ANSYS Fluent to determine values of heat transfer coefficients and ANSYS Mechanical to obtain temperature field and stresses. Based on the determined temperature field and stresses, a creep lifetime calculation according to ČSN EN 12952-4 is performed. Then creep design check for operating time 200 000 hours was carried out according to ČSN EN 13445-3. It was determined that in this case the tube bends are not the critical spot in comparison with the straight sections of tubes.
Detailed record
Deformation and damage of tube bundle bends due to temperature
 Michálková, Anežka ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
This master’s thesis deals with the problem of determining the thermal load of cross-flow tube bundle bends in steam superheater. Firstly, the theoretical basis of computational fluid dynamics and finite element method is introduced, and the possible methods of creep damage evaluation are presented as it was assumed that creep damage would be the most significant damage mechanism. The next part of this thesis describes simulations in ANSYS Fluent to determine values of heat transfer coefficients and ANSYS Mechanical to obtain temperature field and stresses. Based on the determined temperature field and stresses, a creep lifetime calculation according to ČSN EN 12952-4 is performed. Then creep design check for operating time 200 000 hours was carried out according to ČSN EN 13445-3. It was determined that in this case the tube bends are not the critical spot in comparison with the straight sections of tubes.
Detailed record

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