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.

scholarly journals Investigation of Regularities of Heat and Mass Transfer and Phase Transitions during Water Droplets Motion through High-Temperature Gases

2014 ◽  
Vol 6 ◽  
pp. 865856 ◽  
Author(s):  
Roman S. Volkov ◽  
Olga V. Vysokomornaya ◽  
Genii V. Kuznetsov ◽  
Pavel A. Strizhak
Keyword(s):  
Mass Transfer ◽  
Phase Transitions ◽  
High Temperature ◽  
Heat And Mass Transfer ◽  
Water Droplet ◽  
Small Neighborhood ◽  
Droplet Evaporation ◽  
Optical Methods ◽  
Water Droplets ◽  
Two Phase

The macroscopic regularities of heat and mass transfer and phase transitions during water droplets motion through high-temperature (more than 1000 K) gases have been investigated numerically and experimentally. Water droplet evaporation rates have been established. Gas and water vapors concentrations and also temperature values of gas-vapor mixture in small neighborhood and water droplet trace have been singled out. Possible mechanisms of droplet coagulation in high-temperature gas area have been determined. Experiments have been carried out with the optical methods of two-phase gas-vapor-droplet mixtures diagnostics (“Particle Image Velocimetry” and “Interferometric Particle Imaging”) usage to assess the adequateness of developed heat and mass transfer models and the results of numerical investigations. The good agreement of numerical and experimental investigation results due to integral characteristics of water droplet evaporation has been received.

Characterizing Mass-Transfer Mechanism During Gas Hydrate Formation from Water Droplets

2021 ◽  
pp. 132626
Author(s):  
Huiyong Liang ◽  
Dawei Guan ◽  
Kangji Shi ◽  
Lei Yang ◽  
Lunxiang Zhang ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Transfer Mechanism ◽  
Water Droplets ◽  
Gas Hydrate Formation ◽  
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 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
Sign in / Sign up

Export Citation Format

Share Document