scholarly journals Numerical simulation of the formation of dry spots during film evaporation

2021 ◽  
Vol 2119 (1) ◽  
pp. 012086
Author(s):  
A V Shebelev ◽  
A V Minakov ◽  
D Y Kochkin ◽  
O A Kabov
Keyword(s):  
Numerical Technique ◽  
Calculated Data ◽  
Cell Geometry ◽  
Film Evaporation ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Dry Spot ◽  
The Mathematical Model ◽  
Spot Formation ◽  
Good Agreement

Abstract This paper presents a developed methodology for calculating heat and mass transfer processes in a cylindrical evaporation cell. The mathematical model reproduces all significant features of the evaporation cell geometry. In this cell, a layer of liquid is formed on a substrate with a diameter of 51 mm, heated below. To simulate heat transfer during film evaporation on a heated substrate, a numerical technique based on the Volume of Fluid method was used. The developed model was used to study the process of dry spot formation during film evaporation. The calculated data are compared with the experiment on the profile of the free surface of the film during evaporation and rupture. In general, results of this testing demonstrated good agreement with experiment. As a result, it was shown that developed numerical method makes it possible to describe process of formation dry spots.

scholarly journals The Mathematical Model and Numerical Study of Heat and Mass Transfer Processes in the Combustion Chamber of Diesel-Generator Units with a Valve-Inductor Generator

2020 ◽  
pp. 611-625
Author(s):  
Dmitriy V. Guzei ◽  
Andrey V. Minakov ◽  
Vasiliy I. Panteleev ◽  
Maksim I. Pryazhnikov ◽  
Dmitriy V. Platonov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Combustion Chamber ◽  
Heat And Mass Transfer ◽  
Operating Conditions ◽  
Diesel Generator ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Actual Geometry ◽  
The Mathematical Model

The mathematical model of heat and mass transfer processes in the combustion chamber of diesel generator units with valve inductor generators has been developed. The mathematical model takes into account the actual geometry of the combustion chamber and the operating conditions of the diesel engine. A study of the main characteristics of a diesel generator in a wide range of modes of operation has been carried out. In addition to energy characteristics, environmental parameters have been considered

scholarly journals NUMERICAL SIMULATIONS FOR NON CONSERVATIVE HYPERBOLIC SYSTEM. APPLICATION TO TRANSIENT TWO-PHASE FLOW WITH CAVITATION PHENOMENON

2019 ◽  
Vol 24 (2) ◽  
pp. 218-235
Author(s):  
Abdelmjid Qadi El Idrissi ◽  
Boujemâa Achchab ◽  
Abdellatif Agouzal
Keyword(s):  
Numerical Technique ◽  
Liquid Mixtures ◽  
Dissolved Gas ◽  
Two Phase ◽  
Gas Concentration ◽  
Transient Flows ◽  
Cavitation Phenomenon ◽  
The Mathematical Model ◽  
Theoretical Results ◽  
Good Agreement

A numerical method for simulating transient flows of gas-liquid mixtures is proposed. The mathematical model, established for a suspension of gas bubbles in liquid, includes an equation taking into account the relative velocity between the gas and liquid. A numerical technique based on the Mac Cormack scheme combined with the method of characteristics is presented. Theoretical results for transients initiated by a rapid closing valves are compared with measurements. A good agreement is found particularly for large values of initial dissolved gas concentration.

scholarly journals Mathematical modelling of solid desiccant systems

2018 ◽  
Vol 23 ◽  
pp. 00029
Author(s):  
Anna Pacak ◽  
Demis Pandelidis ◽  
Sergey Anisimov
Keyword(s):  
Heat Exchanger ◽  
Humidity Ratio ◽  
Desiccant Wheel ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
System 2 ◽  
Model Equations ◽  
System 1 ◽  
The Mathematical Model ◽  
Method Show

In this study, the mathematical model equations for solid desiccant system integrated with indirect evaporative coolers with Maisotsenko - Cycle are presented. The authors chose the modified ε–NTU method to describe heat and mass transfer processes in regenerative indirect evaporative cooler and desiccant wheel. The models based on the ε–NTU method show satisfactory agreement with experimental results. That is why this method allows to analyze and develop the performance of solid desiccant systems. In this study, the models allowed to prove that solid desiccant system with an additional heat exchanger before the desiccant wheel (System 1) obtains higher thermal COP values, higher humidity ratio drop and lower supply airflow temperatures in comparison to system with only one heat exchanger after the desiccant wheel (System 2).

scholarly journals Mathematical modeling of ignition of coal-water slurries particles coated with water film

2018 ◽  
Vol 194 ◽  
pp. 01001 ◽  
Author(s):  
V.G. Afanaseva
Keyword(s):  
Mathematical Modeling ◽  
Mass Transfer ◽  
Water Film ◽  
Film Evaporation ◽  
Evaporation Temperature ◽  
Transfer Processes ◽  
Fuel Layer ◽  
Ignition Dynamics ◽  
Mass Transfer Processes ◽  
Thermal Preparation

The results of the mathematical modeling of heat and mass transfer processes occurring jointly with ignition of coal-water slurries particles covered with a water film are presented. It is shown that water film thickness can have a significant effect on the ignition dynamics. In addition, it was found out that the main fuel layer is heated to the evaporation temperature during water film evaporation. As a result, following processes of thermal preparation (evaporation of moisture, thermal decomposition) occur faster.

scholarly journals ANALYSIS METHOD OF CALCULATION PARAMETERS OF HEAT AND MASS TRANSFER PROCESSES IN THE STIRLING ENGINE

2017 ◽  
Vol 3 ◽  
pp. 298
Author(s):  
Sergej Semyonov ◽  
Sergej Tikhonov ◽  
Mihail Donchenko ◽  
Jurij Lukyanov ◽  
Andrej Perminov
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Analysis Method ◽  
Calculation Methods ◽  
Method Of Calculation ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
The Mathematical Model ◽  
Optimal Calculation

The article highlights the optimal calculation methods for determining the parameters of heat and mass transfer processes occurring in the rotary-vane engine with an external supply of heat. It is shown that the mathematical model of working processes must consist of two parts. One part describes the processes occurring in the isolated volume. The second part describes the processes of mass exchange between the working chambers of two modules, as well as a heater or a cooler.

scholarly journals The Mathematical Model of Hydrodynamics and Heat and Mass Transfer at Formation of Steel Ingots and Castings

2015 ◽  
Vol 15 (1) ◽  
pp. 13-16 ◽  
Author(s):  
V.I. Bondarenko ◽  
V.V. Bilousov ◽  
F.V. Nedopekin ◽  
J.I. Shalapko
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Expert System ◽  
Heat And Mass Transfer ◽  
Computational Algorithm ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Steel Ingots ◽  
The Mathematical Model

Abstract The generic mathematical model and computational algorithm considering hydrodynamics, heat and mass transfer processes during casting and forming steel ingots and castings are offered. Usage domains for turbulent, convective and non-convective models are determined depending on ingot geometry and thermal overheating of the poured melt. The expert system is developed, enabling to choose a mathematical model depending on the physical statement of a problem.

The mathematical model of the carbon dioxide burial in the reservoir saturated with hydrate

2016 ◽  
Vol 11 (2) ◽  
pp. 181-187 ◽  
Author(s):  
N.G. Musakaev ◽  
M.K. Khasanov
Keyword(s):  
Mathematical Modeling ◽  
Carbon Dioxide ◽  
Kinetic Mechanism ◽  
System Of Equations ◽  
Carbon Dioxide Injection ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Multiphase Systems ◽  
The Mathematical Model ◽  
And Diffusion

The mathematical modeling of the carbon dioxide injection into the reservoir initially saturated with methane and its hydrate was carried out. The system of equations, which is describe the heat and mass transfer processes in porous medium, was obtained using the methods of mechanics of multiphase systems. The assessment of the conditions under which we can neglect the kinetic mechanism of the formation of gas hydrate and diffusion mixing of carbon dioxide and methane is presented.

scholarly journals Fluid Flow Turbulence in the Proximities of the Metal-Slag Interface in Ladle Stirring Operations

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 192 ◽  
Author(s):  
Fabian Andrés Calderón-Hurtado ◽  
Rodolfo Morales Dávila ◽  
Kinnor Chattopadhyay ◽  
Saúl García-Hernández
Keyword(s):  
Continuous Monitoring ◽  
Multiphase Model ◽  
Fluid Turbulence ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Three Phase ◽  
Eye Opening ◽  
Slag Entrainment ◽  
Flow Turbulence ◽  
Good Agreement

Three-phase interactions (metal-slag-argon) in ladle stirring operations have strong effects on the metal-slag mass transfer processes. Specifically, the thickness of the slag controls the fluid turbulence to an extent that once trespassing a critical thickness, increases of stirring strength no longer effect the flow. To analyze these conditions, a physical model considering the three phases was built to study liquid turbulence in the proximities of the metal-slag interface. A velocity probe placed close to the interface permitted the continuous monitoring and statistical analyses of any turbulence. The slag eye opening was found to be strongly dependent on the stirring conditions, and the mixing times decreased with thin slag thicknesses. Slag entrainment was enhanced with thick slag layers and high flow rates of the gas phase. A multiphase model was developed to simulate these results and was found to be a good agreement between experimental and numerical results.

scholarly journals Mathematical modeling of heat and mass exchange processes in the evaporative cooler

2021 ◽  
Vol 304 ◽  
pp. 01012
Author(s):  
Nizomjon Usmonov ◽  
Shaxlo Mavjudova ◽  
Adeliya Ivanisova
Keyword(s):  
Mathematical Modeling ◽  
Air Conditioning ◽  
Heat And Mass Exchange ◽  
Transfer Processes ◽  
Exchange Processes ◽  
Mathematical Expressions ◽  
Mass Transfer Processes ◽  
Evaporative Cooler ◽  
Air Conditioning Systems ◽  
The Mathematical Model

This article describes the advantages of the widespread using of the evaporative coolers for cooling recycled wastewater in the air conditioning systems in various industries. The mathematical model of heat and mass transfer processes in the evaporative coolers has been developed. The dependence of the changes in the temperature of the air leaving the evaporator on the irrigation density is considered. When comparing the values obtained by using mathematical expressions and experiments, the resulting difference was 6.7%.

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