The Hydrodynamic And Temperature Field In A 2–Dimensional Rectangular Space A Numerical Study

1984 ◽  
Vol 4 (2) ◽  
pp. 49-52
Author(s):  
A. Barba ◽  
G. Bergeles ◽  
N. Athanassiadis
Keyword(s):  
Temperature Field ◽  
Numerical Study

Two-dimensional numerical study of temperature field in an anode supported planar SOFC: Effect of the chemical reaction

2011 ◽  
Vol 36 (6) ◽  
pp. 4228-4235 ◽  
Author(s):  
Bariza Zitouni ◽  
G.M. Andreadis ◽  
Ben Moussa Hocine ◽  
Abdenebi Hafsia ◽  
Haddad Djamel ◽  
...  
Keyword(s):  
Temperature Field ◽  
Chemical Reaction ◽  
Numerical Study ◽  
Two Dimensional

Experimental and Numerical Study of Transport Phenomena in a Simulated Hydrothermal Crystal Growth System of Fluid-Saturated Porous Layer

2000 ◽  
Author(s):  
D. Mishra ◽  
A. Pal ◽  
N. Nemick ◽  
A. K. Saha ◽  
V. Prasad ◽  
...  
Keyword(s):  
Temperature Field ◽  
Porous Layer ◽  
Hydrothermal System ◽  
Numerical Study ◽  
Transport Phenomena ◽  
Composite Layer ◽  
Staggered Grid ◽  
Working Fluid ◽  
Hydrothermal Crystal Growth ◽  
Numerical Predictions

Abstract A simulated, non-pressurized hydrothermal system consisting of a fluid-superposed porous layer is fabricated and used for visualization and measurement of the temperature field using liquid crystal thermography. The system is used for various boundary conditions with pure glycerine as the working fluid and the porous layer is made of 3mm diameter glass beads. Experimental data is recorded using a color CCD camera and flow visualization is obtained through a long exposure video photography. A calibration is performed to relate the temperature with scattered colors at an orthogonal angle to the incoming white light sheet. Quantitative temperature data is obtained through this calibration and compared with the numerical predictions. For numerical studies the system is modeled as a composite layer of fluid and porous charge using the Darcy-Brinkman-Forchheimer flow model. A two-dimensional curvilinear algorithm using finite volume technique with a non-staggered grid is used to simulate the temperature field and transport phenomena for various Rayleigh–Darcy number combinations of varying aspect ratio. The results, for the first time, make an attempt towards understanding the transport process in hydrothermal system through both numerical simulation and experimental validation.

Numerical Study on Fuel Preheating at Cold Start Phase in an Ethanol Flex Fuel Engine

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Ying Wang ◽  
Zhensheng Liu
Keyword(s):  
Temperature Field ◽  
Field Distribution ◽  
Numerical Study ◽  
Cold Start ◽  
Fuel Temperature ◽  
Temperature Field Distribution ◽  
Heating Chamber ◽  
Pure Ethanol ◽  
Engine Operation ◽  
Flex Fuel

The low vapor pressure of ethanol and the high latent heat of vaporization at low temperatures cause the difficulties of cold start in a flex fuel vehicle when it is fueled with pure ethanol. Preheating fuel is one of the effective methods to solve the above cold start problem. Thus, it is crucial to obtain the fuel temperature distribution in the heating system for fuel preheating process. For this purpose, the numerical analysis is adopted here to simulate the fuel preheating process at a cold start phase and explore the change of the fuel temperature field under different influence factors. The results indicate that the starting temperature has obvious impact on the temperature field distribution in the heating chamber and preheating time but has little effect on the volume of cold fuel in the connecting line at the end of heating. When the starting temperature is −5 °C, the preheating time is 8.3 s. When the starting temperature increases up to 15 °C, the preheating time will decrease as 4.9 s. Furthermore, the lower the starting temperature is, the higher the overall temperature of the heating chamber is. The installing angle of injectors has some influence on the temperature field distribution, and the cold fuel ratio reduces slightly when the angle increases from 30 deg to 60 deg. The calculation results indicate that the temperature of fuel at the injector inlet is above 20 °C, and the fuel injected during the first three cycles of the engine operation is hot fuel.

scholarly journals Experimental and numerical study of the effect of coil structure on induction nitriding temperature field

2020 ◽  
Vol 12 (7) ◽  
pp. 168781402093848
Author(s):  
Kangjie Song ◽  
Jing Guan ◽  
Kunmao Li ◽  
Jing Liu
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Induction Heating ◽  
Current Density ◽  
Numerical Study ◽  
Radial Temperature ◽  
Current Frequency ◽  
Variable Pitch ◽  
Variable Radius ◽  
Heating Efficiency

The axial and radial temperature distributions of an induction heating workpiece considerably impact the subsequent nitriding process. To obtain a satisfactory temperature distribution, an equal pitch coil, a variable pitch coil, and a variable radius coil were designed. Furthermore, an induction heating model that exhibits electromagnetic and temperature field coupling was established; thus, the effects of the current density and frequency on the heating efficiency and temperature distribution of the workpiece were analyzed and compared. In addition, an induction heating experiment was conducted to verify the model. According to the numerical results, the variable radius coil can reduce the axial temperature difference in comparison with equal pitch coil and variable pitch coil. Hence, the workpiece heated using the variable radius coil can achieve a better temperature distribution when compared with those heated by the equal pitch coil and variable pitch coil, with appropriate current density and current frequency values.

scholarly journals Numerical study on temperature field of the sandwich plate defects based on MATLAB

2020 ◽  
Vol 143 ◽  
pp. 01003 ◽  
Author(s):  
Ruoyang Zhou ◽  
Xiaoxiong Zha ◽  
Chao Wang
Keyword(s):  
Temperature Field ◽  
Thermal Imaging ◽  
Sandwich Plate ◽  
Numerical Study ◽  
Heating Time ◽  
Thickness Direction ◽  
Processing Quality ◽  
Infrared Thermal Imaging ◽  
Different Thickness

As for the defects of the plate whose length and width are more than 8 times larger than the thickness direction, the finite difference numerical calculations are carried out by using the software of MATLAB. The surface temperature of defects in different positions, different thickness defects, different heating heat flow and heating time, and defects under defects are analyzed correspondingly by the program. According to the temperature difference results of the flawless surface and the flawed surface, the feasibility of infrared thermal imaging to detect the defects of the sandwich plate is analyzed to ensure the processing quality of the sandwich plate.

Rayleigh-Be´nard Convection in a Small Aspect Ratio Enclosure: Part I—Bifurcation to Oscillatory Convection

1993 ◽  
Vol 115 (2) ◽  
pp. 360-366 ◽  
Author(s):  
D. Mukutmoni ◽  
K. T. Yang
Keyword(s):  
Temperature Field ◽  
Oscillatory Flow ◽  
Numerical Study ◽  
Oscillatory Convection ◽  
Small Aspect Ratio ◽  
Subharmonic Bifurcation ◽  
Average Temperature ◽  
Aspect Ratios ◽  
Boussinesq Fluid ◽  
Steady Convection

The present numerical study documents bifurcation sequences for Rayleigh-Be´nard convection in a rectangular enclosure with insulated sidewalls. The aspect ratios are 3.5 and 2.1 and the Boussinesq fluid is water (average temperature of 70°C) with a Prandtl number of 2.5. Two transitions are documented numerically. The first transition is from steady-state to oscillatory flow and the second is a subharmonic bifurcation as the Rayleigh number is increased further. The dynamics of the flow and temperature field is analyzed in detail for the subcritical steady convection and the supercritical oscillatory convection. The numerical results compared well with experiments, both qualitatively and quantitatively.

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