NUMERICAL MODELING OF HEAT AND MASS TRANSFER IN STARCH SYSTEMS

1999 ◽  
Vol 42 (2) ◽  
pp. 449-455 ◽  
Author(s):  
J. Irudayaraj ◽  
Y. Wu
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Heat And Mass Transfer

Thermal convection in melting zone of hollow microparticle Al2O3

2021 ◽  
pp. 20-25
Author(s):  
V.V. Shekhovtsov ◽  
◽  
YU.A. Abzaev ◽  
O.G. Volokitin ◽  
A.A. Klopotov ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Liquid Phase ◽  
Heat And Mass Transfer ◽  
Convective Heat ◽  
Thermal Convection ◽  
Melting Zone ◽  
Melting Front ◽  
Α Al2o3 ◽  
Inner Region

The paper presents the results of numerical modeling of development melting zone hollow spherical microparticle α-Al2O3. The object of the study was part circular sector, which represents the shell of hollow particle, which is formed under action plasma flow. Numerically describe the unsteady convective heat and mass transfer in shell hollow particle, we used the system Navier-Stokes equations in Boussinesq approximation, which describes the weak convection medium. Due to the high coefficient of porosity (P = 0.56) initial agglomerated particle with the α-Al2O3 structure, the inner region at the stage of heating Tp ≥ Tmelt is in the conditions heat exchange with the incoming heat flux, as result of which the temperature center coincided with the temperature particle surface. Result of overheating of the condensed phase, liquid layer of fused grains is formed in the inner and outer regions microparticle. In this case, the melting front is directed towards center shell. Result of numerical modeling, it has been established that convective heat and mass transfer is observed in melting zones (liquid phase), vector field of which covers almost the entire region of the liquid phase. It was found that thermal convection in the external liquid phase is characterized by velocities that are more than 2 times higher than the displacement velocity in the inner region of the particle. It is shown that there is no displacement of the material inside the convection region, thereby inhomogeneous heating occurs in the molten layer of the particle, which significantly affects the speed of movement of the melting front.

Influence of shrinkage during natural rubber sheet drying: Numerical modeling of heat and mass transfer

2019 ◽  
Vol 149 ◽  
pp. 798-806 ◽  
Author(s):  
Clement Ajani ◽  
Stefano Curcio ◽  
Racha Dejchanchaiwong ◽  
Perapong Tekasakul
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Natural Rubber ◽  
Heat And Mass Transfer ◽  
Rubber Sheet

Numerical modeling of heat and mass transfer during coffee roasting process

2011 ◽  
Vol 105 (2) ◽  
pp. 264-269 ◽  
Author(s):  
Angelo Fabbri ◽  
Chiara Cevoli ◽  
Laura Alessandrini ◽  
Santina Romani
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Heat And Mass Transfer ◽  
Roasting Process ◽  
Coffee Roasting

scholarly journals Numerical modeling of heat and mass transfer in cylindrical ducts

2010 ◽  
Vol 31 (1) ◽  
pp. 33-43
Author(s):  
Piotr Duda ◽  
Grzegorz Mazurkiewicz
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Analytical Solution ◽  
Heat And Mass Transfer ◽  
Liquid Metals ◽  
Mesh Size ◽  
Working Fluid ◽  
Cooling Systems ◽  
Fully Developed Turbulent Flow ◽  
Steady State Heat

Numerical modeling of heat and mass transfer in cylindrical ductsIn this work, numerical modeling of steady state heat and mass transfer is presented. Both laminar and hydrodynamically fully developed turbulent flow in a pipe are shown. Numerical results are compared with values obtained from analytical solution of such problems. The problems under consideration are often denoted as extended Graetz problems. They occur in heat exchangers using liquid metals as working fluid, in cooling systems for electric components or in chemical process lines. Calculations were carried out gradually decreasing the mesh size in order to examine the convergence of numerical method to analytical solution.

Numerical Modeling of Heat and Mass Transfer during Contact Baking of Flat Bread

2015 ◽  
Vol 39 (4) ◽  
pp. 345-356 ◽  
Author(s):  
Farzad Sadeghi ◽  
Nasser Hamdami ◽  
Mohammad Shahedi ◽  
Ali Rafe
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Heat And Mass Transfer ◽  
Flat Bread
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