scholarly journals Modelling of Heat Transfer and Phase Transformations in the Rapid Manufacturing of Titanium Components

Author(s):  
Antonio Crespo
2019 ◽  
Vol 254 ◽  
pp. 02023
Author(s):  
Marcin Kubiak

This work concerns numerical modelling and computer simulations of temperature field and phase transformations during Yb:YAG laser heating of sheets made of S355 steel. The distribution of laser power emitted by Trumpf laser head D70 is used in the analysis. The heat source is modelled on the basis of interpolation algorithms using geostatistical kriging method. Coupled heat transfer and fluid flow in the fusion zone are described respectively by transient heat transfer equation with convective term and Navier-Stokes equation. The kinetics of phase transformations and volumetric fractions of arising phases are obtained on the basis of Johnson-Mehl-Avrami (JMA) and Koistinen-Marburger (KM) models. Continuous Heating Transformation (CHT) diagram is used for heating process and Continuous Cooling Transformation (CCT) diagram is used for heated steel with the decomposition of final volume fractions of phases transformed form austenite dependant on cooling rates.


2008 ◽  
Vol 6 ◽  
pp. 205-209
Author(s):  
V.Sh. Shagapov ◽  
R.R. Urazov

The flow of wet natural gas in the pipeline is considered in the presence of the formation of gas hydrates on the internal walls of the channel. In the description of the phenomenon, such interrelated processes as phase transformations and mass transfer of water into the composition of gas hydrates, heat transfer between the gas stream and the environment, heat conductivity in the ground are taken into account.


2019 ◽  
Vol 7 (2) ◽  
pp. 167-195
Author(s):  
Geniy V. Kuznetsov ◽  
Ivan S. Voytkov ◽  
Svetlana S. Kralinova ◽  
Yuliana K. Atroshenko

Author(s):  
С.З. Сапожников ◽  
В.Ю. Митяков ◽  
А.В. Митяков ◽  
А.Ю. Бабич ◽  
Э.Р. Зайнуллина

AbstractFor the first time, heat transfer during condensation has been studied using gradient heat flux measurement. The applicability of the new method has been tested on a model of a well-studied object—a circular pipe. The experiments involved heat transfer investigation during condensation of saturated water vapor at the outer and inner surfaces of the pipe. Gradient heat flux measurement is shown to be highly informative, which opens up new prospects for research in the field of heat transfer during phase transformations, has been revealed.


2021 ◽  
Vol 26 ◽  
pp. 101973
Author(s):  
Joonas Ilmola ◽  
Aarne Pohjonen ◽  
Sami Koskenniska ◽  
Oskari Seppälä ◽  
Olli Leinonen ◽  
...  

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