Determination of the heat convection coefficient by CFD simulation of heat transfer processes at forced convection

2020 ◽  
Author(s):  
Seher Yusnieva Kadirova ◽  
Zhivko Dimitrov Kolev
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
Cfd Simulation ◽  
Heat Convection ◽  
Convection Coefficient ◽  
Transfer Processes

scholarly journals CFD simulation of forced heat transfer of gas in pipe

2019 ◽  
Vol 112 ◽  
pp. 01008 ◽  
Author(s):  
Zhivko Kolev ◽  
Seher Kadirova
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Cfd Simulation ◽  
Geometric Model ◽  
Internal Surface ◽  
Heat Convection ◽  
Steel Pipe ◽  
Measured Temperature ◽  
Simulation Methodology ◽  
Transfer Processes

This paper presents results from CFD simulation of heat transfer processes in ABAQUS. The investigations are realized at forced convection of air in steel pipe. Verification of the computing mesh and validation of the model, have been done. The average heat convection coefficients have been determined by methodology based on criteria equations, and on simulation methodology. Heat transfer processes between air flow in a steel pipe and the environment, have been experimentally accomplished. In order to analyze the processes of heat convection between the fluid and the internal surface of the pipe, numerical modelling is applied. A geometric model of the fluid flowing in the pipe is built. The computing mesh has been verified by increasing the number of cells and nodes. The numerical model has been validated based on experimentally measured temperature values and the simulation data. The heat convection coefficients have been investigated by analogy of the above. The results demonstrate that the numerical model is adequate and can be used to study similar heat transfer processes.

scholarly journals Comparative Study on Thermos-Hydraulic Performance of Different Cross Section Shapes of Microchannels with Supercritical CO2 Fluid

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yi Tu ◽  
Yu Zeng
Keyword(s):  
Heat Transfer ◽  
Cross Section ◽  
Supercritical Co2 ◽  
Heat Transfer Performance ◽  
Hydraulic Performance ◽  
Heat Convection ◽  
Transfer Performance ◽  
Convection Coefficient ◽  
Section Shape ◽  
Supercritical Co2 Fluid

The influence of the cross section shape of microchannels on the thermos-hydraulic performance of the supercritical CO2 fluid is an important issue in the design of industrial compact heat exchangers, but few studies have been conducted about this issue. In this paper, comparative studies of the flow and heat transfer performance of SCO2 fluid in horizontal microchannels with circular, semicircular, rectangle, and trapezoidal cross sections were conducted numerically. The comparison is based on the same hydraulic diameter and length for all channel types and is carried out under the same mass flux, outlet pressure, and wall heat flux. The fluid bulk temperature in this analysis ranges from 285 K to 375 K, which covers the pseudocritical point of SCO2. The results show that the circular channel has the highest average heat convection coefficient, while the trapezoidal channel has the worst convective heat transfer performance under the same hydraulic diameter and boundary conditions. The results also indicate that the effect of cross section shape on the heat convection coefficient is significantly greater than that on the channel pressure drop, and the existence of the corner region in the cross section, especially the acute angle, will weaken the heat transfer performance.

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