scholarly journals STUDY AND SIMULATION OF HEAT TRANSFER PROCESSES DURING FOAM GLASS HIGH TEMPERATURE PROCESSING

2018 ◽  
Vol 14 (3) ◽  
pp. 153-160 ◽  
Author(s):  
Sergey V. Fedosov ◽  
Maksim O. Bakanov ◽  
Sergey N. Nikishov
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Foam Glass ◽  
Glass Structure ◽  
Raw Material ◽  
Transfer Processes ◽  
Research Outcomes ◽  
The Subject ◽  
High Temperature Processing ◽  
Adequate Research

The paper presents basic aspects of simulation of pores formation and growth in the foam glass structure process during raw material mixture high temperature processing. The key mathematical approaches to heat transfer processes simulation and the dynamics of the pores radius growth in the raw material mixture structure are presented. The key assumptions and restrictions allowing representing the most adequate research outcomes at this stage of the subject development are outlined.

Heat Transfer Processes in High-Temperature Flows of Two-Phase Media

2001 ◽  
Vol 32 (7-8) ◽  
pp. 7
Author(s):  
M. I. Osipov ◽  
K. A. Gladoshchuk ◽  
A. N. Arbekov
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Two Phase ◽  
Transfer Processes

scholarly journals NUMERICAL SIMULATION OF HEAT TRANSFER PROCESSES IN LINING AND OPTIMIZATION OF HEAT WORK OF THE UNIT

2018 ◽  
Vol 15 (30) ◽  
pp. 609-626
Author(s):  
B. A. UNASPEKOV ◽  
R. BAZAROV ◽  
S. S. AUELBEKOV ◽  
T. I. IRGIBAEV ◽  
O. D. SEITKAZINOV ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
High Temperature ◽  
Natural Gas ◽  
Tunnel Kiln ◽  
Computer Calculation ◽  
Combined System ◽  
Transfer Processes ◽  
Hot Air ◽  
Burning Zone

The features of heat and mass transfer inlining of high-temperature tunnel kiln for the burning of refractory materials are revealed by numerical simulation of heat transfer processes. Use of modern computer calculation programs permits to choose optimal constructions of trolley walls and heart lining. This ensures improved hermeticity of workspace and 15-20% reduction of heat loss. We studied the operation of a hightemperature of the unit with a combined system that ensured efficient burning of natural gas as well as regulation of temperature regime in the thermal aggregate workspace. A procedure was advanced to calculate consumption of fuel by gas burners and hot air over burning zone positions of high-temperature tunnel kilns when using a combined system of natural gas burning. The heat work of a tunnel kiln was optimized. This permitted to supply maximal quantity of hot air and natural gas into the initial positions of burning zone of tunnel kiln and to ensure technologically required temperatures of products burning (1780-1800ºС).

scholarly journals The Influence of Droplet Dispersity on Droplet Vaporization in the High-Temperature Wet Gas Flow in the Case of Combined Heating

2021 ◽  
Vol 13 (7) ◽  
pp. 3833
Author(s):  
Gintautas Miliauskas ◽  
Egidijus Puida ◽  
Robertas Poškas ◽  
Povilas Poškas
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Phase Change ◽  
Flue Gas ◽  
Gas Flow ◽  
Internal Heat ◽  
Radiation Absorption ◽  
Water Droplets ◽  
Transfer Processes ◽  
Equilibrium Evaporation

The change in the thermal and energy state of the water droplet is defined numerically. The influence of droplet dispersity on the interaction of the transfer processes was evaluated. In influence of the Stefan flow was considered as well. The internal heat transfer of the droplet was defined by the combined heat transfer through effective conductivity and radiation model. The results of the numerical modeling of heat and mass transfer in water droplets in a wet flue gas flow of 1000 °C highlight the influence of the variation in heat transfer regimes in the droplet on the interaction of the transfer processes in consistently varying phase change regimes. The results of the investigation shows that the inner heat convection diminishes intensively in the transitional phase change regime because of a rapid slowdown of the slipping droplet in the gas. The radiation absorption in the droplet clearly decreases only at the final stage of equilibrium evaporation. The highlighted regularities of the interaction between combined transfer processes in water droplets are also valid for liquid fuel and other semi-transparent liquids sprayed into high-temperature flue gas flow. However, a qualitative evaluation should consider individual influence of dispersity that different liquids have.

scholarly journals Comprehensive analysis of transfer processes in modern high-temperature heat exchangers

2019 ◽  
Vol 41 (3) ◽  
pp. 26-32
Author(s):  
B. Soroka ◽  
V. Zgurskyi
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Exchangers ◽  
Exchange Process ◽  
Comprehensive Analysis ◽  
Cfd Modeling ◽  
Tube Heat Exchanger ◽  
Transfer Processes ◽  
Temperature Heat ◽  
Heat Exchange Process

The CFD modeling of high-temperature tube heat exchanger has been carried out. The results of numerical analysis of internal and external secondary emitters’ (SEE) influence upon intensity and uniformity of resulting heat transfer have been presented and discussed. An internal SEE have the determining impact upon heat exchange process thus enhancing the resulting heat flux till extra 40%.

scholarly journals Investigation of the flow conditions in a high-performance heat exchanger

2010 ◽  
Vol 31 (3) ◽  
pp. 37-53 ◽  
Author(s):  
Stanisław Łopata ◽  
Paweł Ocłoñ
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Heat Exchanger ◽  
High Performance ◽  
Classical Model ◽  
Flow Distribution ◽  
Flow Conditions ◽  
Transfer Processes ◽  
Fully Developed Turbulent Flow ◽  
The Subject

Investigation of the flow conditions in a high-performance heat exchangerCFD (Computational Fluid Dynamics) computations are carried out in order to investigate the flow distribution and its influence on the heat transfer processes in the high-performance heat exchanger. The subject of this investigation is the classical model of the high-performance heat exchanger with elliptical tubes and rectangular fins. It is possible to find the flow domains where the heat transfer conditions are impaired due to the fully developed turbulent flow. Therefore, the considerable thermal loads occur that may cause the breakdown of the heat exchanger. The emphasis of this investigation is put on the zones and the locations where the tubes are not properly fed with liquid, that result in occurrence of cavitation.

scholarly journals MATERIAL INSULASI TERHADAP EFEK KEHILANGAN PANAS PADA JALUR PIPA PANAS BUMI

PETRO ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 163
Author(s):  
Samsol Samsol ◽  
Kris Pudyastuti ◽  
Nicko Matthe Lie
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
High Temperature ◽  
Low Temperature ◽  
Heat Loss ◽  
Calcium Silicate ◽  
Foam Glass ◽  
The Other

<p><em>Heat loss which occured because heat transfer from high temperature to low temperature is one of major problem in piping design in geothermal. Insulation used to solve the problem. These analysis carried out in 18 inch pipeline in steam field. Calcium silicate, rockwool, and foam glass is selected as 3 materials in these study. These 3 materials have different thermal conductivity, so ability to withstand heat for each of them is different. This research used to determine the best material to solve heat loss. Rockwool is the best material from the other 2 </em></p>

AFM study of the dynamics of α-alumina surface faceting during high-temperature processing

1995 ◽  
Vol 53 ◽  
pp. 334-335 ◽  
Author(s):  
Michael W. Bench ◽  
Jason R. Heffelfinger ◽  
C. Barry Carter
Keyword(s):  
High Temperature ◽  
Thin Foil ◽  
Sem Analysis ◽  
Conductive Coatings ◽  
Force Microscopy ◽  
Minimal Sample ◽  
Atomic Force ◽  
Formation And Evolution ◽  
High Temperature Processing ◽  
Nominal Surface

To gain a better understanding of the surface faceting that occurs in α-alumina during high temperature processing, atomic force microscopy (AFM) studies have been performed to follow the formation and evolution of the facets. AFM was chosen because it allows for analysis of topographical details down to the atomic level with minimal sample preparation. This is in contrast to SEM analysis, which typically requires the application of conductive coatings that can alter the surface between subsequent heat treatments. Similar experiments have been performed in the TEM; however, due to thin foil and hole edge effects the results may not be representative of the behavior of bulk surfaces.The AFM studies were performed on a Digital Instruments Nanoscope III using microfabricated Si3N4 cantilevers. All images were recorded in air with a nominal applied force of 10-15 nN. The alumina samples were prepared from pre-polished single crystals with (0001), , and nominal surface orientations.

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