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.

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.

Effects of pH and surfactant on the forced convection of Al2O3/water and TiO2/water nanofluids

2020 ◽  
pp. 1-18
Author(s):  
Deepak Khurana ◽  
Sudhakar Subudhi
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
Particle Concentration ◽  
Sodium Dodecyl ◽  
Suspension Stability ◽  
Heat Transfer Characteristics ◽  
Maximum Enhancement ◽  
Effects Of Ph ◽  
Set Up ◽  
The Stability

Abstract The present paper deals with the forced convection of Al2O3/water and TiO2/water nanofluids with the variation of pH and addition of surfactant in nanofluids. The aim of this study is to investigate the effect of suspension stability on the heat transfer and pressure drop characteristics of nanofluids. The present experimental set up is same as used by our earlier paper [1]. The suspension stability of nanofluids is improved by varying pH of nanofluids. The pH in this study is varied from 3.5±0.2 to 12.5±0.2. Addition of surfactants is employed to improve the suspension stability of nanofluids. The SDS (sodium dodecyl sulfate) surfactant of 0.05 wt % is used to increase the stability of nanofluids in the present study. It is observed that by increasing the suspension stability with the variation of pH and addition of surfactant, the heat transfer characteristics have improved appreciably. The maximum enhancement in heat transfer is obtained with TiO2/water nanofluids at a particle concentration of 0.1 vol % and a pH of 3.5±0.2.

Numerical Analysis on Heat Transfer Characteristics of Double Ventilation Glass with Hot Channel

2012 ◽  
Vol 512-515 ◽  
pp. 2887-2890
Author(s):  
Han Bing Qi ◽  
Yu Shi Wang ◽  
Qiu Shi Wang ◽  
Jing Wang ◽  
Dong Li
Keyword(s):  
Heat Transfer ◽  
Air Temperature ◽  
Flow Rate ◽  
Structural Characteristics ◽  
Air Distribution ◽  
Transfer Model ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Computational Fluid Dynamics Cfd ◽  
Set Up

The structural characteristics and heat transfer characteristics of double ventilation glass with hot channel are analyzed, whose heat transfer model is set up, we simulate air distribution of double ventilation glass with hot channel using Computational Fluid Dynamics (CFD) scheme as a simulation technique. The results show that the requirement of supplying air can be realized in winter, when the heating plates are set up in the hot channel, the air temperature of outlet is 290 K, and the flow rate of outlet is 1.03 m/s; which can be realized in summer, when the cooling plates are set up in the hot channel, the air temperature of outlet is 290 K, and the flow rate of outlet is 1.12m/s.

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.

Sign in / Sign up

Export Citation Format

Share Document