Discussions on the Methods of Preventing Heat Transfer Fluids from Oxidation in Open Heating System Based on Liquid-Phase Organic Heat Transfer Fluids Heater

2014 ◽  
Vol 1070-1072 ◽  
pp. 1722-1726
Author(s):  
Guang Xiao Kou ◽  
Rong Rong Lu ◽  
Jing Hua Yang ◽  
Ling Ling Cai ◽  
Pei Na Shang
Keyword(s):  
Heat Transfer ◽  
Liquid Phase ◽  
Technological Process ◽  
Cooling Water ◽  
Heat Pipes ◽  
Heating System ◽  
Schematic Diagram ◽  
Heat Transfer Fluids ◽  
Advantages And Disadvantages ◽  
Cooling Coils

Introduces the technological process of the open heating system with a liquid-phase organic heat transfer fluids heater by analyzing the advantages and disadvantages of preventing heat transfer fluids from oxidation based on expansion pipe with cooling water casing. And it presents two methods to prevent heat transfer fluids from oxidation by arranging directly cooling coils or pulsating heat pipes in the expansion tank; it also provides the schematic diagram of those methods as well as comparatively analyzes their advantages and disadvantages.

Ionic liquids as heat transfer fluids: comparison with known systems, possible applications, advantages and disadvantages

2015 ◽  
Vol 84 (8) ◽  
pp. 875-890 ◽  
Author(s):  
E A Chernikova ◽  
L M Glukhov ◽  
V G Krasovskiy ◽  
L M Kustov ◽  
M G Vorobyeva ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Ionic Liquids ◽  
Heat Transfer Fluids ◽  
Advantages And Disadvantages

Self-rewetting heat transfer fluids and nanobrines for space heat pipes

2010 ◽  
Vol 67 (9-10) ◽  
pp. 1030-1037 ◽  
Author(s):  
Raffaele Savino ◽  
Roberto Di Paola ◽  
Anselmo Cecere ◽  
Raimondo Fortezza
Keyword(s):  
Heat Transfer ◽  
Heat Pipes ◽  
Heat Transfer Fluids

RESEARCH OF THERMAL AND MASS-EXCHANGE PROCESSES IN GAS-LIQUID FILM ABSORBERS IN SURFACE-ACTIVE TECHNOLOGY

2021 ◽  
pp. 3-16
Author(s):  
O. Dzevochko ◽  
M. Podustov ◽  
A. Dzevochko
Keyword(s):  
Mathematical Modeling ◽  
Heat Transfer ◽  
Mass Transfer ◽  
Heat Transfer Coefficient ◽  
Liquid Phase ◽  
Transfer Coefficient ◽  
Sulfur Trioxide ◽  
Cooling Water ◽  
Transfer Coefficients ◽  
The Heat Transfer Coefficient

The article states that surfactants have an asymmetrically constructed molecule that contains hydrophilic and hydrophobic groups. The main department of surfactant production is the process of sulfation of organic matter with gaseous sulfur trioxide. It is shown that the process of sulfation in gas-liquid film absorbers consists of the following stages: the process of mass transfer of sulfur trioxide from the gas stream to the liquid phase; the process of absorption of sulfur trioxide by organic matter with the passage of an exothermic chemical reaction; the process of heat exchange between the liquid phase and the gas stream; the process of heat exchange between the liquid phase and the flow of cooling water. Studies of heat and mass transfer processes at these stages make it possible to select the necessary equations for the calculation of heat transfer coefficients, heat transfer coefficients and mass transfer coefficient. It is recommended to calculate the heat transfer coefficient from liquid to gas by the equation when the diffusion and thermal Prandtl numbers are close to unity. The use of the classical equation to calculate the heat transfer coefficient from the liquid phase to the wall of the reaction tube did not give the desired result. Therefore, an equation was used that takes into account the properties of the gas-liquid flow as a whole. It is recommended to calculate the heat transfer coefficient from the reaction pipe wall to the cooling water flow according to the classical Nusselt equation. Experimental data processing data for calculating the density and dynamic viscosity of the reaction mass along the length of the reactor are presented. The equation for calculating the mass transfer coefficient was obtained by analyzing 6 equations of different authors who were engaged in the process of sulfation of organic substances. A mathematical description of the sulfation process in a film absorber was developed for analysis. During the development of the mathematical description, the balance equations of mass and heat transfer for the reaction tube were compiled. Based on the results of mathematical modeling, an equation was chosen that includes the tangential stress at the gas-liquid interface. The results of mathematical modeling were compared with Gutierrez's experimental data and the results of Dabir's mathematical modeling. The obtained results will be used in mathematical modeling of the sulfation process in a film absorber.

Development of Methods and Instruments of Measuring Liquid-Phase Heat Transfer Fluids’ Viscosity

2014 ◽  
Vol 1070-1072 ◽  
pp. 1982-1986
Author(s):  
Guang Xiao Kou ◽  
Pei Na Shang ◽  
Jing Hua Yang ◽  
Rong Rong Lu ◽  
Ling Ling Cai
Keyword(s):  
Heat Transfer ◽  
Liquid Phase ◽  
Measurement Methods ◽  
Traditional Methods ◽  
Heat Transfer Fluids ◽  
Performance Indexes ◽  
At Home

Viscosity, as one of important performance indexes of liquid-phase heat transfer fluids, its measurement methods and instruments have developed greatly in recent years. This paper introduces the traditional methods and theory of measuring liquid-phase heat transfer fluids’ viscosity as well as summarizes the development of measuring liquid-phase heat transfer fluids viscometer at home and abroad.

scholarly journals Testing algorithm for heat transfer performance of nanofluid-filled heat pipe based on neural network

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 751-760
Author(s):  
Lei Lei
Keyword(s):  
Neural Network ◽  
Heat Transfer ◽  
Heat Pipe ◽  
Heat Transfer Performance ◽  
Volume Fraction ◽  
Heat Pipes ◽  
Transfer Performance ◽  
Analysis Model ◽  
Accurate Analysis ◽  
Testing Algorithm

AbstractTraditional testing algorithm based on pattern matching is impossible to effectively analyze the heat transfer performance of heat pipes filled with different concentrations of nanofluids, so the testing algorithm for heat transfer performance of a nanofluidic heat pipe based on neural network is proposed. Nanofluids are obtained by weighing, preparing, stirring, standing and shaking using dichotomy. Based on this, the heat transfer performance analysis model of the nanofluidic heat pipe based on artificial neural network is constructed, which is applied to the analysis of heat transfer performance of nanofluidic heat pipes to achieve accurate analysis. The experimental results show that the proposed algorithm can effectively analyze the heat transfer performance of heat pipes under different concentrations of nanofluids, and the heat transfer performance of heat pipes is best when the volume fraction of nanofluids is 0.15%.

Three-dimensional heat transfer analysis of flat-plate oscillating heat pipes

2021 ◽  
pp. 117189
Author(s):  
Kimihide Odagiri ◽  
Kieran Wolk ◽  
Stefano Cappucci ◽  
Stefano Morellina ◽  
Scott Roberts ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Three Dimensional ◽  
Heat Pipes ◽  
Heat Transfer Analysis
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