scholarly journals Analysis Of Three Layer Concentric Tube Heat Exchange Using Mathematic Modeling

2021 ◽  
Vol 10 (3) ◽  
pp. 86-92
Author(s):  
Rinaldy Valendry
Keyword(s):  
Mathematical Modeling ◽  
Heat Exchange ◽  
Coming Out ◽  
Theoretical Calculations ◽  
Fluid Temperature ◽  
Modeling Methods ◽  
Mathematic Modeling ◽  
Cold Fluid ◽  
Theory Calculation ◽  
Exchange Apparatus

A three-channel concentric pipes heat exchanger is a development or improvement of a two-channel concentric heat exchange apparatus. This study was conducted to determine the output temperature of each channel, and compare the results of theoretical calculations using mathematical modeling of experimental results conducted in the field. So that obtained difference of value between result of experiment to result of theory calculation. In this study have 3 variations of temperature data that is 50 °C, 55°C, and 60 °C with two streams namely CounterFlow and PararellFLow and discharge 2.5 l/minute, while cold fluid with 25 °C discharge 1.5 l/minute. From the above analysis it can be concluded that the temperature of the hot fluid coming out of the APK in the experiment tends to be higher than the temperature of the hot fluid coming out of the APK on theoretical calculations of mathematical modeling methods. Meanwhile, the cold cold fluid temperature coming out of the APK in experimental tends to be lower than the temperature of the cold fluid coming out of the APK on theoretical calculations of mathematical modeling methods.

Evaluation of the functional tension of foreign medical student’s organisms in adapting to educational activities

2020 ◽  
pp. 755-755
Author(s):  
N. K. Smagulov ◽  
A. A. Adilbekova ◽  
N. V. Gitenis
Keyword(s):  
Mathematical Modeling ◽  
Foreign Students ◽  
Educational Process ◽  
Educational Activities ◽  
Modeling Methods ◽  
Functional Stress

The use of mathematical modeling methods allowed us to develop criteria for functional stress for assessing and predicting the level of functional stress of foreign students in the process of adaptation to the educational process.

scholarly journals POLYMERS AND PLASTIC USE FOR THE HEAT-EXCHANGE EQUIPMENT (REVIEW)

2020 ◽  
pp. 59-71
Author(s):  
I.O. Mikulionok
Keyword(s):  
Heat Exchange ◽  
Heat Exchangers ◽  
Polymeric Materials ◽  
Strength Properties ◽  
Polymers And Plastics ◽  
Heat Exchange Equipment ◽  
Coefficient Of Heat Conductivity ◽  
Exchange Apparatus ◽  
Polymer Type

The possibility of use of the heat-exchangers in whole or in part manufactured with use of polymers and plastics is considered. Despite obvious, at first sight, inexpediency of use of polymeric materials in the heat-exchange equipment (low coefficient of heat conductivity, and also low, in comparison with metals, the strength properties of the majority of the most widespread polymers), «polymeric» heat-exchangers find application in various areas of the industry more and more surely. Classification of heat-exchange apparatuses which constructive elements are executed with use of polymeric materials is proposed. The following signs are the basis for classification: polymer type, a type of polymer meric material, type of the heat-exchange apparatus (a form of heat-exchange elements), reliance on polymeric materials in apparatuses, motion freedom of polymeric heat-exchange elements, level of assembly of a design, and also diameter of tubular elements. Critical analysis the most characteristic designs developed by domestic and foreign designers and inventors is carried out. Ref. 21, Fig. 13.

Application of mathematical modeling methods for solving the problem of optimizing the geometry of the developed external surface of an industrial oil cooler

2020 ◽  
Author(s):  
E. S. Baimetova ◽  
M. R. Koroleva ◽  
A. A. Chernova
Keyword(s):  
Mathematical Modeling ◽  
External Surface ◽  
Modeling Methods ◽  
Industrial Oil ◽  
Oil Cooler

Для отвода тепла от рабочей жидкости гидравлических систем необходима установка маслоохладителя, геометрия которого напрямую влияет на его эффективность. В данной работе рассмотрены вопросы постановки и реализации вычислительного эксперимента для решения задачи оптимизации конструкции промышленного маслоохладителя.

scholarly journals The use of mathematical modeling methods for solving geo-ecological problems of sustainable development of regions

2020 ◽  
Vol 161 ◽  
pp. 01005
Author(s):  
M V Volik
Keyword(s):  
Mathematical Modeling ◽  
Air Pollution ◽  
Sustainable Development ◽  
Numerical Study ◽  
Digital Technologies ◽  
Motor Vehicles ◽  
Gaseous Pollutants ◽  
Mathematical Apparatus ◽  
Modeling Methods ◽  
Ecological Problems

Currently, a number of environmental problems have a significant impact on the stable economic development of the country. A global problem is the study of air pollution. The solution of such geoecological problems should be carried out with the use of modern mathematical apparatus and digital technologies. The paper presents the results of a numerical study of the distribution of gaseous pollutants emitted by motor vehicles in the pedestrian zone of streets. It is shown that the vortex structures formed in the studied city buildings development have a significant impact on the accumulation of anthropogenic impurities.

Research on Heat Exchange Characteristics Between Rock and High-Pressure Fluid Through the Cranny Among Dry Hot Rocks

2010 ◽  
Author(s):  
Lun Li ◽  
Jishun Li ◽  
Shengqi Zhang ◽  
Wei Ma ◽  
Yujun Xue
Keyword(s):  
Power Generation ◽  
High Pressure ◽  
Heat Exchange ◽  
Fossil Fuels ◽  
Fluid Velocity ◽  
Geological Structure ◽  
Energy Sources ◽  
Fluid Temperature ◽  
Geothermal Resources ◽  
Geothermal Power

Owing to energy crisis and global warming, people have to seek for new energy sources to substitute fossil fuels. Human being would maintain persistent development by means of new replaceable energy sources. As a kind of replaceable energy source, geothermal power is attracting people more and more attention. The technology of geothermal power generation has been gradually recognized and applied around the world. Heat exchange is the basic principle of geothermal power generation. A lot of heats stored in dry hot rocks under the ground can be carried out by high-pressure medium. The heat energy drives the steam turbine generator to work. Therefore, the heat exchange between rock and high-pressure fluid through the dry hot rock crannies is a key problem which needs to be solved. Based on the geological structure of rocks, the hypothetical cranny among dry hot rocks is put forward in this paper. The model of a single cranny is established too. The heat exchange between rock and high-pressure fluid through the dry hot rock crannies is analyzed based on the theory of heat transfer and hydrodynamics. The relationship among high-pressure fluid temperature, fluid velocity, dry hot rock crannies length and dry hot rock temperature field is obtained using the single cranny model. It may be useful for the development and application of geothermal resources.

scholarly journals Analysis of Heat Transfer Mechanism for Shelf Vacuum Freeze-Drying Equipment

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hong-Ping Cheng ◽  
Shian-Min Tsai ◽  
Chin-Chi Cheng
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Low Temperature ◽  
Temperature Gradient ◽  
Freeze Drying ◽  
Heat Transfer Fluid ◽  
Processing Temperature ◽  
Fluid Temperature ◽  
Three Dimension ◽  
Flow Rates

Vacuum freeze-drying technology is applicable to the process of high heat-sensitive products. Due to the long drying period and extremely low processing temperature and pressure, the uniform and efficiency of heat transfer fluid temperature in shelf are critical for product quality. Therefore, in this study, the commercial computer fluid dynamics (CFD) software, FLUENT, was utilized for three-dimension numerical simulation of the shelf vacuum freeze-drying process. The influences of different inlet and outlet positions for shelves on the uniformity of the flow rate and temperature were discussed. Moreover, it explored the impacts on the temperature gradient of shelves after heat exchange of different flow rates and low temperature materials. In order to reduce the developing time and optimize the design, the various secondary refrigerants in different plies of shelves were investigated. According to the effect of heat exchange between different flow rates and low temperature layer material shelves on the temperature gradient of shelves surface, the minimum temperature gradient was 20 L/min, and the maximum was 2.5 L/min.

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