Numerical Simulation of Thermal Transit-Time Flow Meter for High Temperature, Corrosive and Irradiation Environment

2013 ◽  
Author(s):  
Elaheh Alidoosti ◽  
Jian Ma ◽  
Yingtao Jiang ◽  
Taleb Moazzeni
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Transit Time ◽  
Flow Rate ◽  
Normal Operation ◽  
Flow Meter ◽  
Thermal Signal ◽  
Time Flow ◽  
In Series ◽  
Measured Flow

In the environments of high temperature (>300 °C – 1000 °C), corrosive and even irradiation application, the challenges of providing reliable and accurate flow rate measurement is significant. In comparing with many other existing technologies for normal operation environments, correlated thermal transit-time flow meter show its advantages of resolving the challenges encountered in those harsh conditions. The correlated thermal signals can be detected by two separated thermal sensors (for example, thermocouples) in series alignment along the pipe, and derive the flow rate. It was evaluated to have accurate measurement for small pipe at slow fluid speed. In the higher flow rate and big pipe size application, this technology shows its weakness due to the limitations associated with slow response time of thermal sensor, dimension, and low strength of thermal signal. In this paper, we present a sophisticated layout of thermal transit-time flow meter with numerical simulation and experiments. By numerical results, we observed that the obtained flow in the bypass route is linearly proportional to the main flow over higher range of flows showing that the measured flow is successfully extended to high range and with stable and accurate measurement results.

scholarly journals Evaluation for Characteristics of Measured Flow Rate by Clamp-on Type Ultrasonic Flow Meter under Wet Steam in SGP65A Piping

2020 ◽  
Vol 2020 (0) ◽  
pp. F08103
Author(s):  
Yuta UCHIYAMA ◽  
Ryo MORITA ◽  
Shuichi UMEZAWA ◽  
Masayuki IBI ◽  
Hirotoshi TAIRA ◽  
...  
Keyword(s):  
Flow Rate ◽  
Wet Steam ◽  
Flow Meter ◽  
Ultrasonic Flow Meter ◽  
Measured Flow

Numerical Simulation and Experiment of the Fire Protecting System of the Manipulator in High Temperature Environment

2019 ◽  
Author(s):  
Byeong Cheon Kim ◽  
Kyoungsik Chang
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Fire Protection ◽  
Cooling System ◽  
Normal Operation ◽  
Hydraulic Pressure ◽  
Flexible Pipe ◽  
Ansys Fluent ◽  
Temperature Environment ◽  
High Temperature Environment

Abstract In the present work, the strategy for cooling the manipulator in high temperature environment is studied using both numerical and experimental methods. Since the manipulator is designed to operate in the environment with the maximum 250 °C temperature, fire protection system and the cooling system should be installed for normal operation of the manipulator. The para-aramid-filament with the thickness of 0.5 mm and Graphite felt with the thickness of 5.5mm is considered for fire protection suit and air blowing technique is applied for cooling the electronic circuit and hydraulic pressure cylinders. For numerical simulation, ANSYS Fluent V18.2 is adopted to simulate the convective heat transfer flows and the radiation with the model, S2S (Surface to surface). Two types of blowing techniques are considered, global blowing and local one. Even though the global blowing at the inlet is most effective for cooling system, so much amount of compressed air is required, which means that extra big compression system should be added in the system. The local blowing is applied to the component with small holes of the flexible pipe and the magnitude of the local blowing mass flow rate is 0.0166kg/s. The technique of local blowing is more effective than the global blowing for cooling the system. To validate numerical simulation, the model is tested within the hot temperature chamber whose mean temperature is approximately 250 °C.

Prediction on Meter Factor of the Turbine Flowmeter With Unsteady Numerical Simulation

2008 ◽  
Author(s):  
Gang Chen ◽  
Yulin Wu ◽  
Guangjun Cao ◽  
Mingjie Li ◽  
Suhong Fu
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Flow Meter ◽  
Calibration Experiment ◽  
Unsteady Simulation ◽  
Good Repeatability ◽  
Unsteady Numerical Simulation ◽  
Rng Turbulence Model ◽  
Driving Torque ◽  
Turbine Flow Meter

The turbine flow meter is widely used in the flow rate measuring for its high accuracy and good repeatability. The flow rate will be calculated based on its meter factor, which is the most important factor of the turbine flow meter. The meter factor means pulses or revolution of the impeller per unit volume, and it can only be got from the calibration experiment. At the given flow rate, the driving torque on the impeller is equal to the drag torque, as many paper have pointed out. Based on the torque balancing equations, unsteady numerical simulation is carried out with RNG turbulence model and UDFs (User Defined Functions) in Fluent Code. The meter factor under different flow rate is calculated with the unsteady simulation. The prediction results based on the numerical simulation showed the same trends as the calibration experiment. At the most flow rate, the meter factor keeps constant, but at the lower flow rate, the meter factor higher than the constant. Because of neglecting the bearing friction drag in the process, the meter factor by numerical simulation is larger than experiment.

scholarly journals Analysis of Precooling Injection Transient of Steam Generator for High Temperature Gas Cooled Reactor

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Yan Wang ◽  
Lei Shi ◽  
Yanhua Zheng
Keyword(s):  
High Temperature ◽  
Mass Flow Rate ◽  
Steam Generator ◽  
Mass Flow ◽  
Flow Rate ◽  
System Analysis ◽  
Water Injection ◽  
Normal Operation ◽  
Coolant Temperature ◽  
High Temperature Gas

After a postulated design basis accident leads high temperature gas cooled reactor to emergency shutdown, steam generator still remains with high temperature level and needs to be cooled down by a precooling before reactor restarts with clearing of fault. For the large difference of coolant temperature between inlet and outlet of steam generator in normal operation, the temperature distribution on the components of steam generator is very complicated. Therefore, the temperature descending rate of the components in steam generator needs to be limited to avoid the potential damage during the precooling stage. In this paper, a pebble-bed high temperature gas cooled reactor is modeled by thermal-hydraulic system analysis code and several postulated precooling injection transients are simulated and compared to evaluate their effects, which will provide support for the precooling design. The analysis results show that enough precooling injection is necessary to satisfy the precooling requirements, and larger mass flow rate of precooling water injection will accelerate the precooling process. The temperature decrease of steam generator is related to the precooling injection scenarios, and the maximal mass flow rate of the precooling injection should be limited to avoid the excessively quick temperature change of the structures in steam generator.

scholarly journals A transit‐time flow meter for measuring milliliter per minute liquid flow

1988 ◽  
Vol 59 (2) ◽  
pp. 314-317 ◽  
Author(s):  
Canqian Yang ◽  
M. Kümmel ◽  
H. So/eberg
Keyword(s):  
Transit Time ◽  
Liquid Flow ◽  
Flow Meter ◽  
Time Flow
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