Experimental Study of the Temperature Field Equation in the Leeward Tunnel during Mine Fire Period

2012 ◽  
Vol 588-589 ◽  
pp. 1842-1848
Author(s):  
Wen Cai Wang ◽  
Yu Hong Jiang ◽  
Tao Hou ◽  
Wei Liu ◽  
Yang Lu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Temperature Field ◽  
Field Equation ◽  
Wind Speed ◽  
Stable Phase ◽  
Measuring Point ◽  
Mine Fire ◽  
Mine Roadway ◽  
Set Up

According to the principle of heat transfer, the temperature field equation in the leeward tunnel was set up and the experimental device with a ratio of 1:20 was built. When it happened to fire in roadway, the correctness of the temperature field equation can be verified by the experiment. In experiments, the armored thermocouple and color paperless recorder were used to record the temperature of each measuring point. The S-3-300 pitot tube and YJB-2500 compensation micro-manometer were used to determine the wind speed. When the mine roadway fired, the experiment determined the temperature field equation experiment coefficient of Kc. It showed that in the developing phase of the fire Kc= 15 ~ 20, in the stable phase of the fire Kc= 10 ~ 15, in the failing phase of the fire Kc= 20 ~ 25.

Concentrated-Leakage Detection by Emulation of Temperature Field

2012 ◽  
Vol 224 ◽  
pp. 93-96 ◽  
Author(s):  
Xin Jian Wang ◽  
Ri Yun Li ◽  
Jian Sheng Chen
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Numerical Optimization ◽  
Underground Water ◽  
Lapse Rate ◽  
Leakage Detection ◽  
Heat Transfer Characteristics ◽  
Coupled Equations ◽  
Set Up ◽  
Flow States

In order to detect the concentrated leakage passages(CLP) more effectively and precisely, the temperature field emulation method of irregularity dam including seepage and leakage is established based on numerical optimization of concentrated leakage passage detection with kinds of boundary conditions. In this model, the effect of lapse rate, radiation from sun and wind speed on temperature field is included. The flow states of underground water determined, the heat transfer characteristics presented and the coupled relation between seepage and temperature distribution constructed, the coupled equations between seepage and heat transfer are set up.

Influence of Environmental Conditions on Temperature Field of Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 1661-1666
Author(s):  
De Jian Shen ◽  
Hao Luan ◽  
De Qing Jia ◽  
Li Zhang
Keyword(s):  
Experimental Study ◽  
Temperature Field ◽  
Wind Speed ◽  
Temperature Difference ◽  
Environmental Conditions ◽  
Large Temperature ◽  
Early Age ◽  
Large Temperature Difference ◽  
Peak Value

The temperature cracking of early-aged concrete is often met by constructors in recent years, because of large temperature difference of core and surface of concrete. Experimental study on temperature field of concrete under different environmental conditions is conducted. Different environmental conditions such as wind speed, formwork removal, sun radiation and conservation are involved. The influence of environmental conditions on the peak value of rising temperature, temperature difference of core and surface and descending speed of temperature of concrete is studied. Result obtained from this study can be used in controlling of early-age cracking of concrete.

Heat Transfer Inside the Physical Vapor Transport Reactor

2016 ◽  
Vol 138 (10) ◽  
Author(s):  
Zeyi Zhang ◽  
Min Xu ◽  
Liqiu Wang
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Relative Strength ◽  
Design Guidelines ◽  
Vapor Transport ◽  
Physical Vapor Transport ◽  
Steady State Condition ◽  
Dimensionless Parameters ◽  
Set Up ◽  
Volume Method

The physical vapor transport (PVT) method is widely adopted to produce semiconductor materials including silicon carbide (SiC). This work focuses on the role of thermal radiation for the heat transfer inside the PVT reactor. The radiation is characterized by two dimensionless parameters relating to the SiC charge and to the growth chamber. A simulation program is set up with the finite-volume method (FVM), considering heat generation, conduction, and radiation under the steady-state condition. Comprehensive results are obtained by tuning values of dimensionless parameters and the associated controlling variables, such as the cooling temperature and the coil current density, and illustrated in the phase diagrams. From the study, we find that the charge size has negligible influence on the temperature field, the crucible conduction determines the temperature level, and the relative strength of the chamber radiation against the crucible conduction modifies the temperature field on the SiC ingot. Finally, design guidelines are proposed with the instructive phase diagram to achieve the optimized thermal performance of the PVT reactor.

Experimental Study on the Effect of Viscous Heating on the Temperature Field in Microchannel Gas Flow

2009 ◽  
Author(s):  
T. T. Zhang ◽  
L. Jia ◽  
C. W. Li ◽  
Y. Jaluria
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Gas Flow ◽  
Superposition Principle ◽  
Slip Flow ◽  
Experimental System ◽  
Flow Region ◽  
Viscous Heating ◽  
Flow And Heat Transfer ◽  
Set Up

An experimental system for single-phase gas flow in microchannels was set up. The effects of viscous heating on the temperature field in the flow were studied experimentally. Also, a theoretical model for the flow and heat transfer in the slip flow region was developed and the resulting equations were solved analytically by using a method based on the superposition principle. The results obtained agree well with the experimental data. The study also provides greater insight into microchannel flow and the associated heat transfer.

scholarly journals An interferometric study of free convection in a window with a heated between-panes blind

2021 ◽  
Author(s):  
Fabio Almeida
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Temperature Field ◽  
Free Convection ◽  
Unique Feature ◽  
Heat Fluxes ◽  
Simplified Model ◽  
Plate Temperature ◽  
Interferometric Study ◽  
Lateral Heat

An experimental study has been conducted to examine free convection in a window with an enclosed aluminum Venetian blind. The unique feature of this experiment was that the blind slats were heated electrically to simulate absorbed solar radiation. Centre-glass convective heat transfer measurements and temperature field visualization were obtained using a laser Mach-Zehnder interferometer. Measurements were made for three plate (glazing) spacings, three blind slat angles, three blind heat fluxes, and two plate temperature differences. It was found that a recently proposed simplified model, called the Reduced Slat Length (RSL) model, closely predicted the experimental results when the flow appeared to be laminar and steady. Under these conditions, the temperature field and lateral heat transfer was dominated by conduction. Under some conditions, evidence of highly unsteady/turbulent flow was observed. As expected, the RSL model performed poorly under these conditions.

scholarly journals An interferometric study of free convection in a window with a heated between-panes blind

2021 ◽  
Author(s):  
Fabio Almeida
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Temperature Field ◽  
Free Convection ◽  
Unique Feature ◽  
Heat Fluxes ◽  
Simplified Model ◽  
Plate Temperature ◽  
Interferometric Study ◽  
Lateral Heat

An experimental study has been conducted to examine free convection in a window with an enclosed aluminum Venetian blind. The unique feature of this experiment was that the blind slats were heated electrically to simulate absorbed solar radiation. Centre-glass convective heat transfer measurements and temperature field visualization were obtained using a laser Mach-Zehnder interferometer. Measurements were made for three plate (glazing) spacings, three blind slat angles, three blind heat fluxes, and two plate temperature differences. It was found that a recently proposed simplified model, called the Reduced Slat Length (RSL) model, closely predicted the experimental results when the flow appeared to be laminar and steady. Under these conditions, the temperature field and lateral heat transfer was dominated by conduction. Under some conditions, evidence of highly unsteady/turbulent flow was observed. As expected, the RSL model performed poorly under these conditions.

The Experimental Investigation on the Internal Temperature Field of Regenerative Burners

2013 ◽  
Vol 291-294 ◽  
pp. 1723-1727
Author(s):  
Zhong Jun Tian ◽  
Shi Ping Jin ◽  
Yu Ming Liang ◽  
Kui Tian ◽  
Zhen Biao Hao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Experimental Investigation ◽  
Temperature Field ◽  
Flue Gas ◽  
Industrial Furnace ◽  
Internal Temperature ◽  
Heating Curve ◽  
Combustion Technology ◽  
Regenerative Cells

The application of regenerative combustion technology to industry burners has been a huge success. This paper presents an experimental study on the change of the temperature field and the concentration of NO in the flue gas in an industrial furnace. The result showed that the concentration of NO increased with the rise of temperature. For the reversing time of 20s, 40s, 60s, and 80s, the temperature of each point changed in accordance with similar rules, but the temperature of the former three measuring points did not obviously change. The heat transfer occured mainly in the last two layers of the regenerative cells, and the utilization of all the regenerators was only 40 percent. The heating curve of the sixth measuring points was significantly different from the cooling one. With the increase of the reversing time, the flue gas and the air temperature variation also increased.

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