Modelling of Combined Heat and Mass Transfer of Water Droplets in Thermal Technology Equipment

2011 ◽  
Author(s):  
Gintautas Miliauskas ◽  
Stasys Sinkunas ◽  
Kristina Norvaisiene ◽  
Kestutis Sinkunas
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Gas Flow ◽  
Thermal State ◽  
Droplet Evaporation ◽  
Heat Transfer Process ◽  
Droplet Surface ◽  
Convective Heating ◽  
Two Phase ◽  
Balancing Energy

Water droplet evaporation process is numerically modelled under various heat and mass transfer conditions. Regularities of heat transfer process interaction are examined. Modelling in this work was performed using the combined analytical–numerical method to investigate heat and mass transfer in the two-phase droplets-gas flow system. The influence of forced liquid circulation on the thermal state of droplets is taken into account by the effective coefficient of thermal conductivity. Calculating the rate of droplet evaporation and the intensity of convective heating, the influence of the Stefan’s hydrodynamic flow is taken into account. Balancing energy fluxes in the droplet to within one hundredth of a percent and using the fastest sinking the droplet surface temperature is determined.

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.

scholarly journals NUMERICAL MODELLING OF INDUCTION CHANNEL FURNACE THERMAL STATE

2021 ◽  
Vol 2021 (3) ◽  
pp. 44-49
Author(s):  
O.I. Bondar ◽  
◽  
O.I. Glukhenky ◽  
Yu.M. Goryslavets ◽  
O.P. Zapadynchuk ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Thermal State ◽  
Standard Form ◽  
Two Phase ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Induction Channel ◽  
Induction Channel Furnace ◽  
Channel Furnace

A mathematical model that describes heat and mass transfer processes in an induction channel furnace is presented. Using the example of a two-phase channel furnace with standard form of channels, the influence of the phase angle between the voltages supplying the furnace inductors on the thermal state of the liquid metal is considered. Values of this angle, which provide minimal melt overheating in channels in comparison with furnace bath have been determined. Ways of intensification of heat and mass transfer processes in two-phase channel furnace have been suggested. References 9, figures 4.

Heat and Mass Transfer Characteristics of Evaporating Falling Films

2019 ◽  
pp. 251-276
Author(s):  
Monssif Najim ◽  
M'barek Feddaoui ◽  
Abderrahman Nait Alla ◽  
Adil Charef
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Gas Flow ◽  
Thermal Protection ◽  
Liquid Films ◽  
Two Phase ◽  
Film Evaporation ◽  
Transfer Characteristics ◽  
Two Phases

This chapter presents a numerical investigation of heat and mass transfer characteristics during the evaporation of liquid films in vertical geometries. A two-phase model is developed to simulate laminar film evaporation into laminar gas flow. The liquid film evaporation is evaluated under adiabatic and heated wall conditions for both pure and binary liquid film. The model is based on a finite difference method to solve the governing equations of the two phases. The obtained results concerns two industrial processes. The first part of the chapter is devoted to the analysis of the thermal protection of vertical channel wall, while the second part is devoted to the desalination process by falling liquid film. The simulations results allowed the determination of the optimal operating conditions for both processes.

Evaluation and Development of Simple Evaporation Models Used in Spray Simulations

2005 ◽  
Author(s):  
G. F. Yao
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Droplet Evaporation ◽  
Droplet Surface ◽  
Published Data ◽  
Single Droplet ◽  
New Model ◽  
Transfer Equations ◽  
Evaporation Models

Given the droplet surface temperature distribution versus time derived from the recent numerical modeling and experimental measurements of a single droplet evaporation, the gas side heat and mass transfer equations used in simple evaporation models for spray simulation in CFD codes are first evaluated. A new model for droplet evaporation is formulated. Instead of using the infinite or conduction limited models for liquid side heat transfer, in the new model, the liquid side heat transfer is simulated based on the Nusselt number. The model is validated against the published data and was found to be accurate in representing the gas and liquid side heat and mass transfer of a single droplet evaporation.

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