scholarly journals Development of unsteady boundary layers on the generatrices of a vertical silicon rod heated by electric current in the mode of conjugate radiation-convective heat transfer

2021 ◽  
Vol 2119 (1) ◽  
pp. 012163
Author(s):  
A. V. Mitina ◽  
V. S. Berdnikov ◽  
K. A. Mitin
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Convective Heat Transfer ◽  
Electric Current ◽  
Convective Heat ◽  
Longitudinal Direction ◽  
Longitudinal Distribution ◽  
Grashof Number ◽  
Inhomogeneous Temperature ◽  
Inhomogeneous Temperature Field

Abstract The nonstationary conjugate radiation-convective heat transfer of a single silicon rod heated by an electric current with the surrounding gas medium is studied numerically in the axisymmetric formulation by the finite element method. The calculations were carried out at the Prandtl number Pr = 0.68, and the range of the Grashof number, determined by the temperature difference and the radius of the rod 9 703 ≤ Gr ≤ 261 977. It is shown that after a short incubation period, a circulation flow is formed. As a result, a significantly inhomogeneous temperature field in the longitudinal direction is formed in a silicon rod heated by an electric current. As the Grashof number increases, the inhomogeneity of the longitudinal distribution of the temperature field increases.

scholarly journals Experimental tests for the occurence of convective heat transfer within the bed of rectangular steel profiles

2012 ◽  
Vol 33 (3) ◽  
pp. 84-95
Author(s):  
Rafał Wyczółkowski ◽  
Dorota Musiał
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Natural Convection ◽  
Heat Exchange ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Experimental Tests ◽  
Steel Sections

Abstract The paper describes tests intended to examine the occurrence of natural convection within the space occupied by 40×20 mm rectangular steel sections. Within these tests the bed of four layers of section was heated by the electric palate heater. Depending on the manner in which the heater was positioned, the tests were divided into two series. In the case of heating from above, the heat flowing through the bed is transferred only by conduction and radiation. When heating the bed from below, in addition to conduction and radiation, also a convective heat transfer will occur. Should this be the case, it will result in the intensification of the heat exchange. The results of measurements carried out have not demonstrated that the occurrence of any possible natural convection would influence the development of a temperature field in this type of charge.

Study of Heat Transfer Control with Magnetic Field Using Higher Order Finite Difference Scheme

2016 ◽  
Vol 8 (3) ◽  
pp. 449-463 ◽  
Author(s):  
R. Sivakumar ◽  
S. Vimala ◽  
S. Damodaran ◽  
T. V. S. Sekhar
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Nusselt Number ◽  
Temperature Field ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Experimental Studies ◽  
Higher Order ◽  
Polar Coordinates ◽  
Cylindrical Polar Coordinates

Abstract.The control of convective heat transfer from a heated circular cylinder immersed in an electrically conducting fluid is achieved using an externally imposed magnetic field. A Higher Order Compact Scheme (HOCS) is used to solve the governing energy equation in cylindrical polar coordinates. The HOCS gives fourth order accurate results for the temperature field. The behavior of local Nusselt number, mean Nusselt number and temperature field due to variation in the aligned magnetic field is evaluated for the parameters 5≤Re≤40, 0≤N≤20 and 0.065≤Pr≤7. It is found that the convective heat transfer is suppressed by increasing the strength of the imposed magnetic field until a critical value of N, the interaction parameter, beyond which the heat transfer increases with further increase in N. The results are found to be in good agreement with recent experimental studies.

scholarly journals The influence of conjugate natural convective heat transfer on the temperature field in a monocrystalline sapphire tape in the Stepanov method

2021 ◽  
Vol 2119 (1) ◽  
pp. 012161
Author(s):  
K. A. Mitin ◽  
V. S. Berdnikov ◽  
A. V. Mitina
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
The Finite Element Method ◽  
Growth Vessel ◽  
Conjugate Formulation ◽  
Stepanov Method

Abstract Natural convective heat transfer in the system “monocrystalline tape – environment – walls of the growth vessel”, geometrically similar to the simplified scheme of the upper part of the heat node in the Stepanov method, is studied numerically by the finite element method in the conjugate formulation. The calculations were performed with a Prandtl number equal to 0.68 (argon), in the range of Grashof numbers 1000 ≤ Gr ≤ 25000 and with a discrete set of tape lengths in the range from 1 to 5.

Finite Analytic Solution of Convective Heat Transfer for Tube Arrays in Crossflow: Part II—Heat Transfer Analysis

1989 ◽  
Vol 111 (3) ◽  
pp. 641-648 ◽  
Author(s):  
Ching Jen Chen ◽  
Tzong-Shyan Wung
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Temperature Field ◽  
Pressure Drop ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Heated Tube ◽  
Tube Arrays

The convective heat transfer and pressure drop in flow past two types of tube array are solved numerically by the Finite Analytic Method in this investigation. The tube arrays considered are an in-line tube array and a staggered tube array with longitudinal and transverse pitch of two. The flow field solution is obtained and analyzed in Part I of the study. In the present Part II, the temperature field, heat transfer characteristics, and pressure drop are investigated. The fluid and tubes are considered to be at the same temperature, except for the array tube, which is heated or cooled. The solution domain covers three pitches of tube arrays in order to simulate accurately the non-periodic behavior of the temperature field downstream of the heated tube. In general, the heat transfer in a staggered array of tubes is found to be higher than that in an in-lined array of tubes. However, the pressure drop in a staggered array arrangement is also higher. Local heat transfer varies between in-line and staggered tube arrays and depends on Reynolds number and Prandtl number. At high Reynolds number, the local heat transfer tends to peak at the upstream surface of the heated tube but away from the stagnation point and becomes minimum at the separation point. Heat transfer in recirculation zones are, in general, small.

A Method of Identifying the Ingredient of Homo-Zeotrope by Measurable Temperature Field of Pipe Convective Heat Transfer Model

2013 ◽  
Author(s):  
Xin Wang ◽  
Ning Mei ◽  
Xijun Yu ◽  
Yan Li
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Model Parameters ◽  
Transfer Model ◽  
Nonlinear Simulation ◽  
Mix Proportion ◽  
Process Error ◽  
Simulation Parameters

A method of identifying the composition of homo-zeotrope with measuring the pipe convective heat transfer temperature field is shown. In the case of the set pressure and low Reynolds number liquid, consider about the full development period of laminar pipe fluid mechanics characters, heat convection transfer temperature field could be known of numerical method with given model parameters. Calculating equation-controlling nonlinear simulation parameters by inverse problem of the convective heat transfer controlling equation, mix proportion can be worked out by the connection between estimating parameters values and the calculated total parameters of each element. Besides, process error analysis suggests the error of mix proportion in calculated parameters matches the given.

Numerical Simulation of Temperature Field for Molten Low Voltage UV Cross-Linking Polyethylene Cable

2013 ◽  
Vol 427-429 ◽  
pp. 421-424
Author(s):  
Zi Cheng Jin ◽  
Yi Ping Lu ◽  
Jia De Han ◽  
Bo Huang ◽  
Zuo Min Wang
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Low Voltage ◽  
Convective Heat Transfer Coefficient ◽  
Cross Linking ◽  
Numerical Heat Transfer

In order to improve the quality of low voltage UV cross-linking product and provide a theoretical basis to the improvement of cross-linking device, the temperature field of cross-section of cable was studied based on the theories of semi-transparent medium radiation and numerical heat transfer in this article. Two cases with different convective heat transfer coefficient of cable surface were researched, and then the temperature distribution in the cable under different boundary conditions of heat convection was analyzed. At last, the temperature field characters of insulating layer and conductor cores in the cable were achieved and a reasonable value range of convective heat transfer coefficient of cable surface was given in this article.

The Temperature Field Analysis about the Thermal Assembly Process of the Roller Sleeve of HFCG160 Roller Press

2014 ◽  
Vol 472 ◽  
pp. 131-135
Author(s):  
Jia Han Bao ◽  
Yong Wang ◽  
Jie Cai
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Test Temperature ◽  
Convective Heat Transfer Coefficient ◽  
Assembly Process ◽  
Roller Press

This paper used the finite element software ANSYS to simulate the thermal assembly process of the roller sleeve of the HFCG160 roller press, and study the change of the temperature field. And then, comparing the simulation temperature with the test temperature, the results show that the simulation temperature is basically consistent with the test temperature, while there are slight biases on the individual points within a certain period of time. The main reason for biases between the simulation temperature and the test temperature is that the convective heat transfer coefficient is average during the simulation, which ignoring the convective heat transfer coefficient decreases with the decreasing of temperature.

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