Numerical results of temperature distribution and solidification behaviour during spray forming

1994 ◽  
Vol 65 (8) ◽  
pp. 322-325 ◽  
Author(s):  
Udo Fritsching ◽  
Hong Zhang ◽  
Klaus Bauckhage
Keyword(s):  
Temperature Distribution ◽  
Spray Forming ◽  
Numerical Results ◽  
Solidification Behaviour

THE TEMPERATURE DISTRIBUTION PRODUCED BY ACOUSTIC ABSORPTION: I. MACROSCOPIC TREATMENT

1966 ◽  
Vol 44 (12) ◽  
pp. 3001-3011 ◽  
Author(s):  
S. Simons
Keyword(s):  
Temperature Distribution ◽  
Acoustic Wave ◽  
Numerical Results ◽  
Time Dependent ◽  
Acoustic Absorption ◽  
Space And Time

A calculation is given of the temperature distribution in space and time produced by the absorption of an acoustic wave propagated inside a medium, under conditions in which the situation may be described macroscopically. The problem is considered for various geometries, and for both constant and time-dependent energies of the incident acoustic wave. Numerical results are obtained, and a discussion is given of their relevance to various experiments.

scholarly journals Flow of a Jeffrey Fluid Between Two Long Vertical Thin Plates with Porous Medium

2018 ◽  
Vol 7 (4.10) ◽  
pp. 1059
Author(s):  
S. Sreenadh ◽  
B. Govindarajulu ◽  
A. N.S. Srinivas ◽  
R. Nageshwar Rao
Keyword(s):  
Porous Medium ◽  
Temperature Distribution ◽  
Fluid Velocity ◽  
Numerical Results ◽  
Thin Plates ◽  
Jeffrey Fluid ◽  
Runge Kutta Method ◽  
Fluid Parameter ◽  
Permeability Parameter ◽  
Order Four

The present study investigates fully developed free - convection Jeffrey fluid flow between two vertical plates with porous medium. The vertical plates are moving with same velocity but in opposite directions. The coupled nonlinear governing equations are solved by using the linearization technique. The solutions for velocity distribution, temperature distribution, skin friction and rate of heat transfer is obtained in the presence of porous medium by Iterative procedure.  Shooting technique with Runge - Kutta method of order four is proposed to compare the numerical results for velocity and temperature distribution. The numerical results obtained by both methods are compared and presented graphically. It is observed that an increase in the permeability parameter causes decrease in the fluid velocity and an increase in the Jeffrey fluid parameter causes an enhancement in the fluid velocity. The significance of various pertinent parameters like Grashof number, Prandtl number, Eckert number and the plate velocity are explained through graphs.  

Constant Temperature at the Surface of an Initially Uniform Temperature, Variable Conductivity Half Space

1971 ◽  
Vol 93 (1) ◽  
pp. 55-60 ◽  
Author(s):  
Leonard Y. Cooper
Keyword(s):  
Temperature Distribution ◽  
Half Space ◽  
Constant Temperature ◽  
Analytic Solutions ◽  
Numerical Results ◽  
Transient Temperature ◽  
Uniform Temperature ◽  
Transient Temperature Distribution ◽  
Temperature Variable ◽  
Variable Conductivity

The transient temperature distribution resulting from a constant and uniform temperature being imposed on the surface of an initially uniform temperature, variable conductivity half space is studied. Various solution expansion ideas are discussed. These are utilized in the solution of an example problem, and the resulting approximate analytic solutions representations are compared to exact numerical results. One of these approximations is found to be superior to the others, and, in fact, it is shown to yield useful results over a range of variables where the nonlinearities of the problem are significant.

Efficiency Comparison Between Circular and Semicircular Fins Circumscribing Circular Pipes

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
R. Chakraborty ◽  
A. Sirkar
Keyword(s):  
Temperature Distribution ◽  
Thermal Performance ◽  
Numerical Results ◽  
Circular Pipe ◽  
Two Dimensional ◽  
Governing Equations ◽  
Degree Polynomial ◽  
Circular Pipes ◽  
Efficiency Comparison ◽  
Detailed Derivation

A new design of fin has been conceived, which is in the shape of a semicircular strip. A step-by-step straightforward detailed derivation of the governing equations for two-dimensional temperature distribution in a semicircular fin has been presented, assuming a third degree polynomial. Numerical results are presented to illustrate the effects of pipe size and the number of semicircular fins on the thermal performance of the fin. It has been shown mathematically that the efficiency of a semicircular fin can be greater than that of a circular fin, having same total volume of fin material when employed over the circumference of a circular pipe.

Numerical-Experimental Study of the Gas LP Atmospheric Burner

2010 ◽  
Author(s):  
A. Rami´rez-Barro´n ◽  
A. Aguilar-Moreno ◽  
A. Gallegos-Mun˜oz ◽  
J. M. Riesco-A´vila ◽  
S. Marti´nez-Marti´nez ◽  
...  
Keyword(s):  
Experimental Study ◽  
Temperature Distribution ◽  
Numerical Models ◽  
Numerical Results ◽  
Experimental Results ◽  
Thermal Camera

A numerical-experimental study of the gas LP atmospheric burner used in the ceramist furnace is presented. A new design of the burner was proposed to obtain a temperature distribution in the furnace better that the temperature distribution obtained with the actual burner. The experimental study helped to know the temperature and flame distribution in the furnace that permit to achieve the temperature of baking of the ceramic. The experimental results were obtained with a thermal camera and thermocouples placed in the furnace. Numerical models were developed with CFD (Fluent ®) comparing the results with the experimental results to obtain the new design of the burner. The experimental and numerical results permitted to identify the zones with temperature near to the temperature of baking, which is reached in the high and intermediate zones of the furnace. Then it is necessary a recirculation of the hot gases toward the low zone of the furnace.

A New Truly Meshless Method for Heat Conduction in Solid Structures

2010 ◽  
Author(s):  
Eisa Ahmadi ◽  
M. M. Aghdam ◽  
Nasrin Sheikhy
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Conduction ◽  
Temperature Distribution ◽  
Meshless Method ◽  
Numerical Results ◽  
Micromechanical Modeling ◽  
Matrix Interface ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

In this study a new meshless method is presented for the analysis of heat transfer in heterogeneous solid structures. The presented meshless method is based on the integral form of energy equation for the sub-particles in the domain of the material. A micromechanical model based on the presented meshless method is presented for analysis of heat transfer, temperature distribution and steady-state effective thermal conductivities of fiber-matrix type of composite materials. Because the domain integration is eliminated in the presented meshless formulation, the computational efforts in presented method are decreased substantially. A small area of the composite system called the representative volume element (RVE) is considered as the solution domain. The fully bonded fiber-matrix interface is considered and contact thermal resistant is neglected in the fiber-matrix interface and so the continuity of temperature and reciprocity of heat flux is satisfied in the fiber-matrix interface. A direct interpolation method is employed for enforcement the appropriate boundary conditions to the RVE. Numerical results are presented for temperature distribution, heat flux and thermal conductivity. Numerical results show that presented meshless method is simple, effective, accurate and less costly method in micromechanical modeling of heat conduction in heterogeneous materials.

Heat Partition and Transient Temperature Distribution in Layered Concentrated Contacts. Part II—Dimensionless Relationships and Numerical Results

1987 ◽  
Vol 109 (3) ◽  
pp. 496-501 ◽  
Author(s):  
M. Rashid ◽  
A. Seireg
Keyword(s):  
Temperature Distribution ◽  
Temperature Rise ◽  
Surface Coating ◽  
Numerical Results ◽  
Operating Conditions ◽  
Transient Temperature ◽  
Transient Temperature Distribution ◽  
Heat Partition ◽  
Recent Interest ◽  
Computer Based

The computer-based model described in Part I is utilized in this paper to develop dimensionless relationships for lubricated unlayered contacts and dry layered contacts. Because of the recent interest in tribological surface coating these relationships can be used to provide parametric evaluations of heat partition and temperature rise in the contacts under different coating parameters and operating conditions.

Measurement of Temperatures on In-Flight Water Droplets by Laser Induced Fluorescence Thermometry

2003 ◽  
Author(s):  
V. Salazar ◽  
J. E. Gonza´lez ◽  
L. A. Rivera
Keyword(s):  
Temperature Distribution ◽  
Fluorescence Emission ◽  
Laser Induced Fluorescence ◽  
Numerical Results ◽  
Temperature Measurements ◽  
Water Droplets ◽  
Fluorescence Dye ◽  
Instantaneous Temperature ◽  
Natural Fluorescence ◽  
Fluorescence Thermometry

This work presents the use of laser induced fluorescence for instantaneous temperature measurements of a 200μm diameter water droplets monodispersed stream traveling downward in a standard stagnant atmosphere. The droplets are doped with small concentrations of a natural fluorescence dye (Pyrene), and with a surfactant substance, cetyldimetylbenzylammoniumchloride (CDBAC) to improve the fluorescence emission. The rate of the two-band pyreme emission (excimer to monomer) is used to determine the temperature. The temperature distribution along the stream of droplets determined for different initial temperatures: (30°C, 40°C and 50°C) at the exit of the nozzle compared very favorably with numerical results.

Dynamic Simulation of Temperature Field in Hybrid Laser-GTAW Welding of Galvanized Steels in a Gap-Free Lap Joint Configuration

2009 ◽  
Author(s):  
Shanglu Yang ◽  
Fanrong Kong ◽  
Ehsan Forroozmehr ◽  
Radovan Kovacevic
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
High Speed ◽  
Numerical Results ◽  
Frame Rate ◽  
Welding Parameters ◽  
Transient Temperature ◽  
Lap Joint ◽  
Joint Configuration ◽  
Galvanized Steels

During hybrid laser-arc welding of galvanized dual phase steel 980 in a gap free lap joint configuration, the welding parameters have the significant influences on the weld quality, which is directly related to the temperature distribution of welds. In this paper, a 3D FEM model is used with the application of the double ellipsoidal moving heat source to simulate the transient temperature field and the dimensions of fusion zone and heat affected zone (HAZ) for hybrid laser-arc keyhole welding of galvanized steels in a gap-free lap joint configuration. Temperature-dependent thermophysical properties are used in the simulation. Effects of various welding parameters on the temperature distribution are studied. To validate the numerical results, a high-speed camera with the frame rate of 4000 fps is used to real-time capture the images of the molten pool. The numerical results show a good agreement with the experimental results.

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