Effect of cooling water flow rates on local temperatures and heat transfer of casting dies

2004 ◽  
Vol 148 (1) ◽  
pp. 57-67 ◽  
Author(s):  
Henry Hu ◽  
Fang Chen ◽  
Xiang Chen ◽  
Yeou-li Chu ◽  
Patrick Cheng
Keyword(s):  
Heat Transfer ◽  
Water Flow ◽  
Cooling Water ◽  
Flow Rates

Effect of Cooling Water Flow Path on the Flow and Heat Transfer in a 660 MW Power Plant Condenser

2019 ◽  
Vol 28 (2) ◽  
pp. 262-270 ◽  
Author(s):  
Dawen Zhong ◽  
Ji’an Meng ◽  
Peng Qin ◽  
Xiaolong Qiu ◽  
Ping Jiang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Water Flow ◽  
Cooling Water ◽  
Flow Path ◽  
Flow And Heat Transfer

Mathematical Formulation of Cooling Water Flow Rates for High Speed Continuous Slab Caster

1981 ◽  
Vol 103 (2) ◽  
pp. 318-327
Author(s):  
Y. P. Singh
Keyword(s):  
Water Flow ◽  
High Speed ◽  
Cooling Water ◽  
Least Square ◽  
Continuous Steel ◽  
Slab Caster ◽  
Flow Rates ◽  
Cooling Flow ◽  
Steel Slab ◽  
Steel Cast

In high speed continuous steel slab castings machine, the partially solidified strand emerging out from the bottomless mold is cooled to complete solidification by means of water sprays arranged through its metallurgical length. The cooling water flow rates are dependent on slab size, grade of steel cast, working length of mold, casting speed, water pressure, spray nozzles and their location in the strand support system of the caster. In this paper an analytical method to predict the spray cooling water flow rates is presented. A least square polynomial is found which best describes extensive data of cooling flow rates obtained from high speed continuous steel slab caster at Linz, Austria. Polynomial curves for various slab sizes, grades of steel cast and casting speeds have been determined using the actual water flow rates data and the developed least square technique. The technique developed in this paper is general and can be used for determination of cooling flow rates of any type of continuous steel casting machine.

Research and Application of Dynamic Secondary Cooling Control System for a Continuous Steel Billet Caster

2012 ◽  
Vol 572 ◽  
pp. 404-409
Author(s):  
Zun Peng ◽  
Wen Hao Hu ◽  
Yan Ping Bao ◽  
Min Wang ◽  
Li Qiang Zhang ◽  
...  
Keyword(s):  
Water Flow ◽  
Cooling System ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Cooling Water ◽  
Transfer Model ◽  
Secondary Cooling ◽  
Billet Temperature ◽  
Flow Rates ◽  
Billet Caster

A two-dimensional heat-transfer model for transient simulation of a billets caster is presented. Its accuracy is verified through measured billet temperature and shell thickness. Billets temperature and solidification are computed by this model as a function of time varying casting speed, secondary cooling water flow rates and temperature, billet cross section, steel grade, and pouring and ambient temperatures. A control methodology and algorithm suitable for online control of 5 strands billet continuous casting machine is integrated in this model. The ability of this model to control the surface temperature profile is demonstrated through dynamic and precise adjustment of secondary cooling water flow rates. This secondary cooling system has been applied to a billet caster in Hangzhou Steel Corporation.

scholarly journals Heat Transfer Characteristics of High-Temperature Dusty Flue Gas from Industrial Furnaces in a Granular Bed with Buried Tubes

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3589
Author(s):  
Shaowu Yin ◽  
Feiyang Xue ◽  
Xu Wang ◽  
Lige Tong ◽  
Li Wang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Water Flow ◽  
Flow Rate ◽  
Waste Heat ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Granular Bed ◽  
Cooling Water Flow Rate

Experimental heat transfer equipment with a buried tube granular bed was set up for waste heat recovery of flue gas. The effects of flue gas inlet temperature (1096.65–1286.45 K) and cooling water flow rate (2.6–5.1 m3/h) were studied through experiment and computational fluid dynamics’ (CFD) method. On the basis of logarithmic mean temperature difference method, the total heat transfer coefficient of the granular bed was used to characterize its heat transfer performance. Experimental results showed that the waste heat recovery rate of the equipment exceeded 72%. An increase in the cooling water flow rate and inlet gas temperature was beneficial to recovering waste heat. The cooling water flow rate increases from 2.6 m3/h to 5.1 m3/h and the recovery rate of waste heat increases by 1.9%. Moreover, the heat transfer coefficient of the granular bed increased by 4.4% and the inlet gas temperature increased from 1096.65 K to 1286.45 K. The recovery rate of waste heat increased by 1.7% and the heat transfer coefficient of the granular bed rose by 26.6%. Therefore, experimental correlations between the total heat transfer coefficient of a granular bed and the cooling water flow rate and inlet temperature of dusty gas were proposed. The CFD method was used to simulate the heat transfer in the granular bed, and the effect of gas temperature on the heat transfer coefficient of granular bed was studied. Results showed that the relative error was less than 2%.

Condensation Measurement of Horizontal Cocurrent Steam/Water Flow

1984 ◽  
Vol 106 (2) ◽  
pp. 425-432 ◽  
Author(s):  
I. S. Lim ◽  
R. S. Tankin ◽  
M. C. Yuen
Keyword(s):  
Heat Transfer ◽  
Water Flow ◽  
Water Layer ◽  
Transfer Coefficients ◽  
Flow Rates ◽  
Heat Transfer Coefficients ◽  
Nusselt Numbers ◽  
Wavy Interface ◽  
Prandtl Numbers ◽  
Inlet Conditions

Condensation of steam on a subcooled water layer was studied in a cocurrent horizontal channel at atmospheric pressure. The heat transfer coefficients were found to vary from 1.3 kW/m2°C to 20 kW/m2°C, depending on whether the liquid interface was smooth or wavy, increased with increasing steam flow rates and water flow rates. For all cases, 50 to 90 percent of the steam condensed within 1.2 m from the entrance. The average Nusselt numbers were correlated with average steam and water Reynolds numbers and average liquid Prandtl numbers, for both smooth and wavy interface flows. Finally, a correlation of the average heat transfer coefficient and condensation rate for wavy interface flow was obtained as a function of inlet conditions and distance downstream.

scholarly journals Theoretical and Numerical Study of Heat Transfer Deterioration in High Performance Light Water Reactor

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
David Palko ◽  
Henryk Anglart
Keyword(s):  
Heat Transfer ◽  
Water Flow ◽  
Mass Flow ◽  
High Performance ◽  
Stokes Equations ◽  
Numerical Study ◽  
International Association ◽  
Flow Rates ◽  
Heat Transfer Deterioration ◽  
Mass Flow Rates

A numerical investigation of the heat transfer deterioration (HTD) phenomena is performed using the low-Re k-ωturbulence model. Steady-state Reynolds-averaged Navier-Stokes equations are solved together with equations for the transport of enthalpy and turbulence. Equations are solved for the supercritical water flow at different pressures, using water properties from the standard IAPWS (International Association for the Properties of Water and Steam) tables. All cases are extensively validated against experimental data. The influence of buoyancy on the HTD is demonstrated for different mass flow rates in the heated pipes. Numerical results prove that the RANS low-Re turbulence modeling approach is fully capable of simulating the heat transfer in pipes with the water flow at supercritical pressures. A study of buoyancy influence shows that for the low-mass flow rates of coolant, the influence of buoyancy forces on the heat transfer in heated pipes is significant. For the high flow rates, buoyancy influence could be neglected and there are clearly other mechanisms causing the decrease in heat transfer at high coolant flow rates.

scholarly journals Design and verification of ultra-high temperature lithium heat pipe based experimental facility

2021 ◽  
pp. 263-263
Author(s):  
Chongju Hu ◽  
Dali Yu ◽  
Meisheng He ◽  
Taosheng Li ◽  
Jie Yu
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Water Flow ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Heating Power ◽  
Normal Operation ◽  
Experimental Facility ◽  
Cooling Water Flow Rate

Lithium heat pipe has broad applications in heat pipe cooled reactors and hypersonic vehicles due to its ultra-high working temperature which is around 1700 K. In this paper, a lithium heat pipe based experimental facility has been designed to test the heat transfer performance of the lithium heat pipe. A simplified mathematical model of heat pipe has been implemented into a CFD approach, which is used to verify the design of lithium heat pipe and its experimental facility. Results showed that the CFD approach is in good agreements with some well-known existing models and experimental data, and deviation between the results is within 5% range. The adjustment range of mixed gas thermal resistance and cooling water flow rate was obtained by analyzing the effects of different cooling conditions on the performance of the experimental facility. It is necessary to ensure the cooling water flow rate is above 0.11l/h to prevent water boiling when the heating power is10kW around, and the optimal proportion of helium is 70% -90%.The operation characteristics of the lithium heat pipe under unsteady state with varying heating power were simulated numerically. The results show that the proportion of helium must be less than 60% for normal operation of the lithium heat pipe. This work provides a reference and numerical verification for the design of lithium heat pipe based experimental facility, which can be used to reveal the heat transfer mechanisms of the lithium heat pipe during the experiment.

Study on the Thermal Characteristics of a Motorized Spindle Unit

2012 ◽  
Vol 479-481 ◽  
pp. 2546-2550
Author(s):  
Teng Qing Wu ◽  
Heng Liu ◽  
Min Qing Jing ◽  
Hong Wei Fan
Keyword(s):  
Water Flow ◽  
Heat Generation ◽  
High Performance ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Thermal Characteristics ◽  
Motorized Spindle ◽  
Flow Rates ◽  
Cooling Water Flow Rate ◽  
Spindle Unit

Heat generation and heat transfer of motorized spindle unit are studied in this paper, including heat generation of built-in motor and rolling bearings, heat conduction, convection and radiation between spindle components. By modeling a FEM model of a high performance motorized grinding spindle, thermal characteristics simulation of the spindle unit is completed. The thermal characteristics under different spindle speeds, different cooling water flow rates and different forced air flow rates are simulated. The numerical results show that spindle speed and cooling water flow rate have significant influences on thermal characteristics of motorized spindle unit. These results are useful to guide the design and verification of motorized spindle unit.

Heat Transfer Performance of Porous Copper Fabricated by Lost Carbonate Sintering Process

2009 ◽  
Vol 1188 ◽  
Author(s):  
Liping Zhang ◽  
David Mullen ◽  
Kevin Lynn ◽  
Yuyuan Zhao
Keyword(s):  
Heat Transfer ◽  
Pore Size ◽  
Water Flow ◽  
Heat Transfer Performance ◽  
Water System ◽  
Heat Removal ◽  
Transfer Performance ◽  
Transfer Coefficients ◽  
Flow Rates ◽  
Porous Copper

AbstractThe heat transfer coefficients of porous copper fabricated by the lost carbonate sintering (LCS) process with porosity range from 57% to 82% and pore size from 150 to 1500 μm have been experimentally determined in this study. The sample was attached to the heat plate and assembled into a forced convection system using water as the coolant. The effectiveness of the heat removal from the heat plate through the porous copper-water system was tested under different water flow rates from 0.3 to 2.0 L/min and an input heat flux of 1.3 MW/m2. Porosity has a large effect on the heat transfer performance and the optimum porosity was found to be around 62%. Pore size has a much less effect on the heat transfer performance compared to porosity. High water flow rates enhanced the heat transfer performance for all the samples.

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