Thermal Insulating System Design for the Wellhead of the Snubbing Service Equipment

2011 ◽  
Vol 71-78 ◽  
pp. 2235-2238
Author(s):  
Chuan Ma ◽  
Li Jun Liu ◽  
Zhong Hua Dai ◽  
Xiao Yan Liu
Keyword(s):  
Temperature Field ◽  
System Design ◽  
Temperature Rise ◽  
Mathematic Model ◽  
Material Object ◽  
Transient Temperature ◽  
Rapid Rate ◽  
Unsteady State ◽  
Thermal Insulating ◽  
Transient Temperature Field

The unsteady state mathematic model was utilized to compute the transient temperature field and determine the heating power, and then a set of thermal insulating system for the wellhead of the snubbing service equipment was designed and manufactured based on the mapping of the material object. The result shows that the numerical results of the cartridge heater’s temperature field agree with the testing values. The thermal insulating system for the wellhead of the snubbing service equipment meets the needs of the snubbing service in the winter; the system possesses the merits of rapid rate of temperature rise, well thermal insulating, safety and convenience.

Comparative Study of FVM and FEM Using Rectangular Element in Heat Conduction Problems for Conductive Materials

2011 ◽  
Vol 321 ◽  
pp. 131-135
Author(s):  
Yue Ping Qin ◽  
Hong Bo Liu ◽  
Chuan Qin ◽  
Guo Hui Su
Keyword(s):  
Temperature Field ◽  
Mathematic Model ◽  
Theoretical Solution ◽  
Transient Temperature ◽  
Actual Problem ◽  
Conductive Materials ◽  
Transient Temperature Field ◽  
Thermal Calculations ◽  
Rectangular Element ◽  
Volume Method

This paper established the mathematic model of plane transient temperature field using the Finite Volume Method according to the energy conservation rule, it clearly interprets the actual physical meaning of fundamental formula in the calculus of variations. The computational domains were subdivided by rectangular elements and the contributing formula was obtained from the elements to respective dots. Comparing the results with FEM results showed that they have same coefficient except the coefficient of time change. This paper analyzed the reason of the different results between FEM and FVM. In addition, the actual problem of two-dimensional temperature field of thermal calculations is resolved by the new arithmetic of FVM and the FEM. Comparing FVM results with the theoretical solution and FEM result shows that the FVM is more approximate to the theoretical solution than the FEM. The new arithmetic of FVM not only can simplify the process of establish equation and make the meaning of formula understandable but also can ensure the calculation accuracy. What’s more, it can extend widely the applied range of the FVM on the problem of temperature field, and has great application value on solving complicated technological problems.

scholarly journals Simulating Convective-Radiative Heat Sinks Effect by means of FEA-based Gaussian Heat Sources and Its Approximate Analytical Solutions for Semi-Infinite Body

2021 ◽  
Author(s):  
Ninh The Nguyen ◽  
John H Chujutalli
Keyword(s):  
Temperature Field ◽  
Heat Source ◽  
Analytical Solutions ◽  
Radiative Heat ◽  
Source Model ◽  
Heat Sinks ◽  
Transient Temperature ◽  
Measured Temperature ◽  
Heat Source Model ◽  
Transient Temperature Field

Abstract FEA-based Gaussian density heat source models were developed to study the effect of convective and radiative heat sinks on the transient temperature field predicted by the available approximate analytical solution of the purely conduction-based Goldak’s heat source. A new complex 3D Gaussian heat source model, incorporating all three modes of heat transfer, i.e., conduction, convection and radiation, has been developed as an extension of the Goldak heat source. Its approximate transient analytical solutions for this 3-D moving heat source were derived and numerically benchmarked with the available measured temperature & weld pool geometry data by Matlab programming with ~5 to 6 times faster than FEA-based simulation. The new complex 3D Gaussian heat source model and its approximate solution could significantly reduce the computing time in generating the transient temperature field and become an efficient alternative to extensive FEA-based simulations of heating sequences, where virtual optimisation of a melting heat source (i.e. used in welding, heating, cutting or other advanced manufacturing processes) is desirable for characterisation of material behaviour in microstructure evolution, melted pool, microhardness, residual stress and distortions.

Numerical Simulation of Three-Dimensional Molten Pool Temperature Field and Flow Field for Laser Melt Injection Based on Fluent

2012 ◽  
Vol 538-541 ◽  
pp. 1837-1842 ◽  
Author(s):  
Long Zhi Zhao ◽  
Zi Wang ◽  
Xin Yan Jiang ◽  
Jian Zhang ◽  
Ming Juan Zhao
Keyword(s):  
Temperature Field ◽  
Liquid Metal ◽  
Molten Pool ◽  
Metal Flow ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Liquid Metal Flow ◽  
Fluent Software ◽  
Thermo Physical Properties

According to the characteristics of laser melt injection, a numerical model for a simplified 3D transient temperature field in molten pool was established using FLUENT software in this paper. In the model, many factors were considered such as liquid metal turbulence, latent heat of phase transformation and material thermo physical properties depending on temperature. The results show that the model can be developed well by FLUENT software. And the results also show that the driving force of the liquid metal flow mechanism.

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