scholarly journals Visualization of Temperature Distribution and Clarification of Heat and Mass Transfer Mechanism in a Single Cell of PEFC

2009 ◽  
Vol 4 (4) ◽  
pp. 438-452 ◽  
Author(s):  
Akira NISHIMURA ◽  
Kenichi SHIBUYA ◽  
Masayuki TAKEUCHI ◽  
Masafumi HIROTA ◽  
Seizo KATO ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Temperature Distribution ◽  
Single Cell ◽  
Heat And Mass Transfer ◽  
Transfer Mechanism ◽  
Mass Transfer Mechanism

scholarly journals Analysis of heat and mass transfer mechanism of vacuum freeze-drying in the primary drying

2007 ◽  
Vol 3 (2) ◽  
pp. 183-191
Author(s):  
Hua Li ◽  
Lihua Li ◽  
Xingli Jiao ◽  
Xueli Qin
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Transfer Process ◽  
Present Status ◽  
Freeze Drying ◽  
Mass Transfer Process ◽  
Transfer Mechanism ◽  
Drying Process ◽  
Mass Transfer Mechanism ◽  
At Home

The freeze-drying process is a complex heat and mass transfer process virtually. The drying process of freeze-drying is not only the key stage which decides the success of freeze-drying, but also the most difficult stage to control. There are lots of papers about heat and mass transfer in vacuum freeze drying at home and abroad. The present status of research on heat and mass transfer during vacuum freeze drying in the primary drying is summed up and analyzed, the trend of research in this field is discussed in this paper.

scholarly journals Influence of radiative heat and mass transfer mechanism in system “water droplet-high-temperature gases” on integral characteristics of liquid evaporation

2015 ◽  
Vol 19 (5) ◽  
pp. 1541-1552 ◽  
Author(s):  
Dmitrii Glushkov ◽  
Genii Kuznetsov ◽  
Pavel Strizhak
Keyword(s):  
Mass Transfer ◽  
High Temperature ◽  
Heat And Mass Transfer ◽  
Water Droplet ◽  
Radiative Heat ◽  
Transfer Mechanism ◽  
Water Droplets ◽  
Mass Transfer Mechanism ◽  
Integral Characteristics ◽  
Liquid Evaporation

Physical and mathematical (system of differential equations in private derivatives) models of heat and mass transfer were developed to investigate the evaporation processes of water droplets and emulsions on its base moving in high-temperature (more than 1000 K) gas flow. The model takes into account a conductive and radiative heat transfer in water droplet and also a convective, conductive and radiative heat exchange with high-temperature gas area. Water vapors characteristic temperature and concentration in small wall-adjacent area and trace of the droplet, numerical values of evaporation velocities at different surface temperature, the characteristic time of complete droplet evaporation were determined. Experiments for confidence estimation of calculated integral characteristics of processes under investigation - mass liquid evaporation velocities were conducted with use of cross-correlation recording video equipment. Their satisfactory fit (deviations of experimental and theoretical velocities were less than 15%) was obtained. The influence of radiative heat and mass transfer mechanism on characteristics of endothermal phase transformations in a wide temperature variation range was established by comparison of obtained results of numerical simulation with known theoretical data for ?diffusion? mechanisms of water droplets and other liquids evaporation in gas.

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