scholarly journals Numerical Simulation of Thermal Field in Mass Concrete With Pipe Water Cooling

2021 ◽  
Vol 9 ◽  
Author(s):  
Fuxian Zhu ◽  
Guorong Chen ◽  
Feng Zhang ◽  
Qingwen Li
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Heat Dissipation ◽  
New Method ◽  
Mass Concrete ◽  
Water Cooling ◽  
Water Pipe ◽  
Pipe Water ◽  
Control Equation ◽  
Water Pipe Cooling

Water pipe cooling is mainly used to control temperature in the construction of mass concrete structures. It is important to reveal how to accurately stimulate the temperature field of mass concrete under action of this water pipe cooling. This paper presents a new method for this purpose. In this method, the contact surface of the water pipe and the concrete is used as the heat dissipation surface into the control equation and the composite Multiquadrics radial basis function (MQ-RBF) and low-order linear polynomial combination are used to discrete the spatial domain. The heat dissipation surface of the water pipe is included in the boundary conditions so that there is no need to build the refined water pipe modeling. This new method not only reduces the calculation cost but also ensures calculation accuracy. Through four calculation examples, this paper show that the algorithm has advantages in the numerical simulation of the concrete temperature field with water pipe cooling.

The Design of Cooling Water Pipe and Cooling Analysis in Mass Concrete

2011 ◽  
Vol 255-260 ◽  
pp. 3510-3513
Author(s):  
Pan Wu Li ◽  
Qian Qian Si
Keyword(s):  
Heat Transfer Performance ◽  
Cooling Water ◽  
Mass Concrete ◽  
Water Cooling ◽  
Water Pipe ◽  
External Temperature ◽  
Concrete Cracking ◽  
Massive Concrete ◽  
Water Pipe Cooling ◽  
Cooling Pipes

Inconstruction process of mass concrete is apt to form excessive temperature stress and cause mass concrete cracking, because of its high inner temperature, big internal and external temperature difference. In order to prevent their cracking, in mass concrete of the internal Settings with cooling water pipe cooling is one of the commonly used massive concrete construction method. This paper presents a massive concrete design of cooling water cooling and calculation theory, based on the cooling pipes in concrete heat transfer performance, through the cooling water pipe and concrete heat exchange principle.

Temperature Control and Anti-Cracking Measures for a High-Performance Concrete Aqueduct

2013 ◽  
Vol 405-408 ◽  
pp. 2739-2742 ◽  
Author(s):  
Zhen Hong Wang ◽  
Shu Ping Yu ◽  
Yi Liu
Keyword(s):  
Temperature Control ◽  
Temperature Difference ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Structures ◽  
Apparent Temperature ◽  
Mass Concrete ◽  
Water Pipe ◽  
Thin Walled ◽  
Water Pipe Cooling

To solve the problem of cracks developing on thin-walled concrete structures during construction, the authors expound on the causes of cracks and the crack mechanism. The difference between external and internal temperatures, basic temperature difference and constraints are the main reasons of crack development on thin-walled concrete structures. Measures such as optimizing concrete mixing ratio, improving construction technology, and reducing temperature difference can prevent thin-walled concrete structures from cracking. Moreover, water-pipe cooling technology commonly used in mass concrete can be applied to thin-walled concrete structures to reduce temperature difference. This method is undoubtedly a breakthrough in anti-cracking technology for thin-walled concrete structures, particularly for thin-walled high-performance concrete structures. In addition, a three-dimensional finite element method is adopted to simulate the calculation of temperature control and anti-cracking effects f. Results show the apparent temperature controlling effect of water-pipe cooling for thin-walled concrete structures.

Numerical Simulation on Real-Time Temperature Field and Strength Field of Bridge Mass Concrete

2011 ◽  
Vol 99-100 ◽  
pp. 346-349
Author(s):  
Chun Mei Zhu ◽  
You Zhi Wang ◽  
Bin Yan ◽  
Hong Wei Gao
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Stress Field ◽  
Real Time ◽  
Simulation Analysis ◽  
Mass Concrete ◽  
Construction Scheme ◽  
Control Schemes ◽  
Concrete Temperature ◽  
Instantaneous Temperature

Access to the internal concrete temperature of the instantaneous temperature field and the strength of the field Real-time monitoring , Concrete temperature field and stress field of the numerical simulation analysis method was proposed . Intuitive accurate prediction that the temperature field and stress field provide a reliable basis on the distribution of temperature control schemes and the construction scheme formulated.

Effect of Water Pipe Cooling on Thermal Stress of FuYang River Aqueduct Structure

2013 ◽  
Vol 438-439 ◽  
pp. 569-572
Author(s):  
Xin Li Bai ◽  
Jiang Yan Li ◽  
Qian Pan
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Simulation Method ◽  
Water Pipe ◽  
Analysis Model ◽  
Element Analysis ◽  
Crack Location ◽  
Cooling Pipe ◽  
Calculation Results ◽  
Water Pipe Cooling

In order to analyze the influence rule of water pipe cooling on the temperature field and thermal stress of large aqueduct structure, the finite element analysis model for FuYang River Aqueduct structure was established. The temperature field and thermal stress of the aqueduct structure were calculated. The following two cases were considered: structure with or without water pipe cooling, as well as the different beginning pouring months (May, June and July). The hydration-degree-based calculation methods of temperature and stress of concrete were adopted, and the high precision discrete simulation method of water pipe was used. The calculation results show that embedding the cooling pipe in concrete can effectively reduce the temperature difference between inside and outside of the early concrete and thermal stress, and is therefore effective to prevent concrete cracks. High accuracy of simulation and analysis can make people basically figure out the specific mechanism of concrete cracking and main factors even before construction, and determine accurately the structure crack location and the developing tendency.

Study on Thermal Field of Mass Concrete by Experiment and Numerical Simulation

2010 ◽  
Vol 168-170 ◽  
pp. 1117-1121
Author(s):  
Xiao Yong Li ◽  
Zhi Gang Zhang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Thermal Field ◽  
Maximum Temperature ◽  
Mass Concrete ◽  
Ansys Software ◽  
Field Development ◽  
Concrete Temperature ◽  
Age Dependent ◽  
Under Construction

An experimental study is conducted to simulate the thermal field in mass concrete. Accurate prediction of the thermal stress by analysis is quite difficult particularly at early ages, due to uncertain age-dependent properties of concrete. A series of tests was conducted in which the temperature was measured for a large number of observation points. The effect of aging and the amount of measuring points on thermal field development that can occur in realistic structures was evaluated. Numerical simulations of the thermal field setup were also performed using the finite element with ANSYS software to verify and extend the experimental interpretation and to determine the maximum temperature value which would occur under construction process. Mass concrete temperature field and stress field for specific projects were measured and analyzed. Numerical simulation of mass concrete temperature field for the actual project is compared with the measured results. The results show that the temperature field of numerical simulation results and measured curves result are of the same trend. And it is feasible that mass concrete temperature field is simulated based on ANSYS.

Numerical Simulation of Heat Pipe Heat Exchanger in Dedicated Ventilation System

2014 ◽  
Vol 608-609 ◽  
pp. 81-85 ◽  
Author(s):  
Gui Xiang Wu ◽  
Xiao Zhi Wang ◽  
Tao Yang ◽  
Da You ◽  
Wen Jiang Chen
Keyword(s):  
Numerical Simulation ◽  
Heat Exchanger ◽  
Heat Pipe ◽  
Heat Dissipation ◽  
Ventilation System ◽  
Simulation Software ◽  
Air Conditioning System ◽  
Processing Module ◽  
Control Equation ◽  
Pipe Heat

Independent dedicated ventilation system is an advanced air conditioning system developed in last few years. There is little research on the design of the system at present. This paper establishes control equation of flow and temperature field based on the energy transmission theory and simulates heat pipe independent dedicated ventilation system using special flow field numerical simulation software. In pretreatment process of FLUENT, this paper uses unstructured six prisms and parallelepiped grid and encrypts grid which makes the result of calculation is more accurate. The simulation uses residual of 10-5 high precision to calculate, and obtains the residual convergence curve. Curve analysis shows that the calculation is very reliable and stable. In post-treatment process, it uses FLUENT results processing module, obtains the temperature flow pattern of heat exchanger independent dedicated ventilation system. We take one of the root canal for analysis. The result shows that the temperature in both sides of the tube is higher, and the temperature through the tube and close to the wall part is lower. It is coincide with the actual working condition of tube ventilation and heat dissipation outside the pipe. This result proves the accuracy of the numerical simulation and provides the reliable theory basis for the design of heat pipe heat exchanger independent dedicated ventilation system.

Influence of Water Pipe Cooling on Thermal Stresses in Mass Concrete

2011 ◽  
Vol 137 ◽  
pp. 12-15
Author(s):  
Xin Li Bai ◽  
Ze Yu Wu ◽  
Wen Liang Ma ◽  
Dan Fei Wang
Keyword(s):  
Temperature Control ◽  
Thermal Stresses ◽  
Early Period ◽  
Control Measures ◽  
Mass Concrete ◽  
Late Period ◽  
Water Pipe ◽  
Effective Measure ◽  
Influence Of Water ◽  
Water Pipe Cooling

Temperature field and stress field of a concrete slab in a ship lock chamber are calculated, considering the influence of layered casting. And the influence of water pipe cooling at the early period of constructing, and at the period after constructing, sunshade, pre-cooled concrete etc are taken into account. The expression of finite difference method considering the effect of water pipe cooling is deducted for temperature analysis. Thermal stress calculation results show that the water pipe cooling at the mid-late period is a comparatively effective measure to reduce tensile stress of chamber mass concrete. And an effective temperature control measure is recommended in summer casting, which is that: sunshade + pre-cooled concrete + water pipe cooling (both at early period and at mid-late period). Mid-late period water pipe cooling must last for three months. Combined with other temperature control measures such as summer cover maintenance, winter cover preservation etc, the concrete cracks can be reduced, and the occurrence of large area run through cracks can be avoided.

Depth Distribution of Temperature in Steel Parts during Surface Hardening by High Frequency Currents

2015 ◽  
Vol 788 ◽  
pp. 129-135 ◽  
Author(s):  
Vladimir Ivancivsky ◽  
Kristina Parts ◽  
Vyacheslav Popov
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Liquid Phase ◽  
Induction Heating ◽  
High Frequency ◽  
Surface Hardening ◽  
Depth Distribution ◽  
Experimental Results ◽  
Water Cooling ◽  
High Frequency Induction

Quenching of steel 45 using high-frequency induction-heating (440000 Hz) with simultaneous shower water cooling was studied. The possibility of liquid-phase creation in the bulk (appr. 0.2 mm) in the material being treated in the absence of melting on the surface was clearly demonstrated by both numerical simulation of the temperature field in the material during hardening and experimental results

Precise simulation analysis of the thermal field in mass concrete with a pipe water cooling system

2015 ◽  
Vol 78 ◽  
pp. 449-459 ◽  
Author(s):  
Xinghong Liu ◽  
Chao Zhang ◽  
Xiaolin Chang ◽  
Wei Zhou ◽  
Yonggang Cheng ◽  
...  
Keyword(s):  
Thermal Field ◽  
Simulation Analysis ◽  
Cooling System ◽  
Mass Concrete ◽  
Water Cooling ◽  
Pipe Water ◽  
Precise Simulation ◽  
Water Cooling System

Numerical Analysis of Temperature Field on the Desktop Computer Motherboard

2014 ◽  
Vol 644-650 ◽  
pp. 1531-1534
Author(s):  
Mao De Li ◽  
Cong Qiu ◽  
Zhi Song Zheng
Keyword(s):  
Numerical Simulation ◽  
Thermal Analysis ◽  
Temperature Field ◽  
Heat Dissipation ◽  
Software Modeling ◽  
Ansys Software ◽  
Analysis Software ◽  
Desktop Computer ◽  
Higher Power ◽  
Simulation Results

The motherboard is one of the most important parts of a computer. According to the ATX motherboard, this article introduces the numerical simulation of temperature field on the motherboard by using thermal analysis software. Firstly introducing the heat production of a motherboard briefly, then the article takes advantage of ANSYS software modeling based on the prototype of ATX motherboard, meshing, solving, and compares the results with the actual value which are well agreed. From the simulation results, it is shown that the display card and Northbridge CPU with higher power consumption. Their heat dissipation configuration should be enhanced.

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