Experimental Study on Heat Transfer Boundary Conditions for Steel Hot Extrusion Process

2013 ◽  
Vol 668 ◽  
pp. 856-860 ◽  
Author(s):  
Chang Yong Liu ◽  
Lei Zhang ◽  
Fei Yu Kang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Boundary Conditions ◽  
Thermal Contact ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Experimental Basis ◽  
P92 Steel ◽  
Glass Lubricant

Heat transfer boundary conditions have significant influence on the FEM analysis of the steel hot extrusion process using glass lubricant. However, the determination of heat transfer coefficient between billet and tooling lacked experimental basis. In order to obtain rational values of the coefficient, experimental study was conducted to measure it on thermal contact between P92 steel and H13 steel separated by glass lubricant. The influence of contact temperature, contact pressure and lubricant thickness was investigated. The obtained results can provide experimental basis for the determination of heat transfer boundary conditions for steel hot extrusion.

Determination of Optimum Profile of One-Dimensional Cooling Fins

1983 ◽  
Vol 105 (3) ◽  
pp. 317-320 ◽  
Author(s):  
S. K. Hati ◽  
S. S. Rao
Keyword(s):  
Heat Transfer ◽  
Differential Equations ◽  
Boundary Conditions ◽  
Minimum Principle ◽  
Problem Formulation ◽  
One Dimensional ◽  
A New Technique ◽  
The One ◽  
Optimum Profile

The optimum design of an one-dimensional cooling fin is considered by including all modes of heat transfer in the problem formulation. The minimum principle of Pontryagin is applied to determine the optimum profile. A new technique is used to solve the reduced differential equations with split boundary conditions. The optimum profile found is compared with the one obtained by considering only conduction and convection.

Simulation of the Hot Extrusion Process of Sintered WCu40 Covered with a Steel Cup

2013 ◽  
Vol 762 ◽  
pp. 520-525
Author(s):  
Qiang Lin ◽  
Zu Yan Liu ◽  
Xin Yan Su
Keyword(s):  
Powder Compact ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Extrusion Temperature ◽  
Optimal Parameters ◽  
Stress Strain ◽  
Strain Relationship ◽  
Relationship Of

In this paper, based on the determination of the stress-strain relationship of sintered W-40wt.%Cu by upsetting tests, the hot extrusion process of the materials covered with a steel cup has been simulated by DEFORM. The effect of the thickness of steel cup, extrusion temperature and extrusion ratio on the extrusion process has been studied, so that a group of optimal parameters could be obtained which is useful to the experiment of powder compact by extrusion with cups.

Combined Parameter and Function Estimation in Heat Transfer With Application to Contact Conductance

1988 ◽  
Vol 110 (4b) ◽  
pp. 1046-1058 ◽  
Author(s):  
J. V. Beck
Keyword(s):  
Heat Transfer ◽  
Parameter Estimation ◽  
Heat Conduction Problem ◽  
Thermal Contact ◽  
Temperature Measurements ◽  
Thermal Contact Conductance ◽  
Transient Temperature ◽  
Function Estimation ◽  
Contact Conductance

This paper discusses parameter estimation, function estimation, and a combination of the two. An example of parameter estimation is the determination of thermal conductivity of solids from transient temperature measurements. An example of function estimation is the inverse heat conduction problem, which uses transient temperature measurements to determine the surface heat flux history. The examples used herein involve the determination of the thermal contact conductance. Two sets of very good data are analyzed. One set of steady-state data was obtained by Antonetti and Eid (1987). The other set was obtained by Moses and Johnson (1986) under transient conditions for periodic contact. Both sets of data are used to illustrate parameter, function, and combined estimation. It is demonstrated that the proposed methods are more powerful then commonly accepted methods. Many other heat transfer problems can be treated using the proposed techniques.

Two-Dimensional Modeling of Heat Transfer Through Sandwich Plates With Inhomogeneous Boundary Conditions on the Faces

1998 ◽  
Vol 120 (3) ◽  
pp. 606-616 ◽  
Author(s):  
Y. Murer ◽  
P. Millan
Keyword(s):  
Heat Transfer ◽  
Boundary Conditions ◽  
Thermal Contact ◽  
Time Dependent ◽  
Rectangular Plates ◽  
Two Dimensional ◽  
The Laplace Transform ◽  
Temperature Solution ◽  
Set Up ◽  
Thermal Phenomena

This paper presents a thermal model describing heat transfer in multispan sandwich rectangular plates. The model is time-dependent and two-dimensional. Complex thermal phenomena occurring in light cores (honeycomb) and thermal contact resistance are taken into account in the model. Particular attention is paid to the boundary conditions on the faces of the plate: radiative and nonuniform convective exchange are taken into account. The global temperature solution for stationary cases is developed on trigonometric and exponential functions bases. The properties of the Laplace transform are used to solve time-dependent cases. Validation experiments are carried out in a wind tunnel ring for two-span plates submitted to convective exchanges on one face; the same configuration is reproduced for an aluminum sandwich plate in an industrial set-up bench. Experimental results agree well with the numerical simulation.

Heat Transfer Boundary Conditions of Piston of Aviation Reciprocating Engine

2014 ◽  
Vol 602-605 ◽  
pp. 357-360
Author(s):  
Shu Xian Chen ◽  
Xin Meng ◽  
Xiang Chuan Guo ◽  
Yong Zhang
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Temperature Distribution ◽  
Theoretical Analysis ◽  
Boundary Conditions ◽  
Piston Ring ◽  
Thermal Loads ◽  
Reciprocating Engine ◽  
Engine Piston

To assess piston’s thermal loads, the direct and effective method is to calculate piston’s temperature distribution. A key point in calculating the temperature field of a piston is the determination of heat transfer boundary conditions of each side, especially the gas side. The thermal boundaries of a piston consist of the piston top side (combustion side), the crevice surfaces, the piston ring land and skirt outside surface, piston underside and pin hole side.The calculating methods for the heat transfer boundary conditions of engine piston are studied according to the theoretical analysis of heat transfer of engine piston, which can be taken as a reference for providing precise boundary conditions for the research on piston’s temperature field.

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