scholarly journals Measurement of Averaged Heat Transfer Coefficients in High-Pressure Vessel during Charging with Hydrogen, Nitrogen or Argon Gas

2007 ◽  
Vol 2 (2) ◽  
pp. 180-191 ◽  
Author(s):  
Peter Lloyd WOODFIELD ◽  
Masanori MONDE ◽  
Yuichi MITSUTAKE
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Pressure Vessel ◽  
Transfer Coefficients ◽  
Argon Gas ◽  
High Pressure Vessel ◽  
Heat Transfer Coefficients

Application of Artificial Neural Network for the Heat Transfer Investigation Around a High-Pressure Gas Turbine Rotor Blade

2011 ◽  
Author(s):  
Ibrahim Eryilmaz ◽  
Sinan Inanli ◽  
Baris Gumusel ◽  
Suha Toprak ◽  
Cengiz Camci
Keyword(s):  
Neural Network ◽  
Heat Transfer ◽  
Artificial Neural Network ◽  
High Pressure ◽  
Rotor Blade ◽  
Incidence Angle ◽  
Transfer Coefficients ◽  
Experimental Conditions ◽  
Heat Transfer Coefficients ◽  
Artificial Neural

This paper presents the preliminary results of using artificial neural networks in the prediction of gas side convective heat transfer coefficients on a high pressure turbine blade. The artificial neural network approach which has three hidden layers was developed and trained by nine inputs and it generates one output. Input and output data were taken from an experimental research program performed at the von Karman Institute for Fluid Dynamics by Camci and Arts [5,6] and Camci [7]. Inlet total pressure, inlet total temperature, inlet turbulence intensity, inlet and exit Mach numbers, blade wall temperature, incidence angle, specific location of measurement and suction/pressure side specification of the blade were used as input parameters and calculated heat transfer coefficient around a rotor blade used as output. After the network is trained with experimental data, heat transfer coefficients are interpolated for similar experimental conditions and compared with both experimental measurements and CFD solutions. CFD analysis was carried out to validate the algorithm and to determine heat transfer coefficients for a closely related test case. Good agreement was obtained between CFD results and neural network predictions.

Heat Transfer to Supercritical Water in Advanced Power Engineering Applications: An Industrial Scale Test Rig

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Gerrit A. Schatte ◽  
Andreas Kohlhepp ◽  
Tobias Gschnaidtner ◽  
Christoph Wieland ◽  
Hartmut Spliethoff
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Supercritical Water ◽  
Test Section ◽  
Power Plants ◽  
Thermal Power ◽  
Internal Diameter ◽  
Test Rig ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

Heat transfer to supercritical water in heated tubes and channels is relevant for steam generators in conventional power plants and future concepts for supercritical nuclear and solar-thermal power plants. A new experimental facility, the high pressure evaporation rig, setup at the Institute for Energy Systems (Technische Universität München) aims to provide heat transfer data to fill the existing knowledge gaps at these conditions. The test rig consists of a closed-loop high pressure cycle, in which de-ionized water is fed to an instrumented test section heated by the application of direct electrical current. It is designed to withstand a maximum pressure of 380 bar at 580 °C in the test section. The maximum power rating of the system is 1 MW. The test section is a vertical tube (material: AISI A213/P91) with a 7000 mm heated length, a 15.7 mm internal diameter, and a wall thickness of 5.6 mm. It is equipped with 70 thermocouples distributed evenly along its length. It enables the determination of heat transfer coefficients in the supercritical region at various steady-state or transient conditions. In a first series of tests, experiments are conducted to investigate normal and deteriorated heat transfer (DHT) under vertical upward flow conditions. The newly generated data and literature data are used to evaluate different correlations available for modeling heat transfer coefficients at supercritical pressures.

Heat transfer coefficients in a high-pressure bubble column

2007 ◽  
Vol 62 (1-2) ◽  
pp. 140-147 ◽  
Author(s):  
Chengtian Wu ◽  
Muthanna H. Al-Dahhan ◽  
Anand Prakash
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Bubble Column ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

Heat-transfer analysis of flat steel ribbon-wound cryogenic high-pressure vessel

2008 ◽  
Vol 222 (9) ◽  
pp. 1745-1751
Author(s):  
Z P Chen ◽  
C L Yu ◽  
J Y Zheng ◽  
G H Zhu
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Pressure Vessel ◽  
Heat Transfer Process ◽  
Heat Transfer Analysis ◽  
Experimental Investigations ◽  
Transfer Model ◽  
High Pressure Vessel ◽  
Flat Steel ◽  
Steel Ribbon

In the past 40 years, more than 7000 layered vessels using flat ribbon-wound cylindrical shells have been manufactured in China. Theoretical as well as experimental investigations show that there are distinct economical and engineering advantages in using such vessels. In this paper, based on the analysis of the heat transfer process in a flat steel ribbon-wound liquid hydrogen high-pressure vessel, a heat transfer model of the walls of the shell and head has been set up. The temperature difference among the interfaces, the heat transfer through the shell and head, and the evaporation rate of the vessel under a steady heat-flow condition has been calculated. The numerical calculations show that such a structure meets the design requirements.

Evaluation of the External Heat Transfer Coefficients in the High-Pressure Turbine of a Full-Scale Core Engine

1996 ◽  
Author(s):  
A. R. Narcus ◽  
H. R. Przirembel ◽  
F. O. Soechting
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
High Pressure ◽  
Data Reduction ◽  
Turbine Blades ◽  
External Heat ◽  
Transfer Coefficients ◽  
High Pressure Turbine ◽  
External Heat Transfer ◽  
Heat Transfer Coefficients

The external heat transfer coefficients, necessary for efficient and accurate turbine blade design, have been quantified using three independent methods of data reduction for the high-pressure turbine blades tested in a core engine. Two of the methods utilized external and internal thermocouple data to determine the heat transfer coefficient levels while the third method required the applied heat-flux levels to determine the coefficients. The heat-flux was calculated from the measured potential difference between thermocouple pairs embedded in the external and internal walls of the turbine blades. The instrumented airfoils were calibrated in a laboratory prior to engine testing. The results of the experimental test showed external heat transfer coefficients could be obtained in an engine environment with a ±3.2% minimum absolute uncertainty. All three data reduction methods produced external heat transfer coefficients within a high degree of accuracy and precision for all data locations on the instrumented airfoils. The three data reduction approaches are presented as well as the data for a specific location on a turbine blade for each method of data reduction. In addition, pre-test calibration procedures and data are discussed along with supporting engine instrumentation used to verify the data acquired during the experimental evaluation.

Characteristics of Heat Transfer for Hydrogen and Wall During Filling Hydrogen Into Actual Tank at High Pressure

2007 ◽  
Author(s):  
Peter L. Woodfield ◽  
Toshio Takano ◽  
Masanori Monde
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Governing Equation ◽  
Hydrogen Gas ◽  
Tank Wall ◽  
Filling Process ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Filling Time ◽  
Good Agreement

An experiment has been made to measure the rise in temperature of hydrogen and tank wall during filling of actual tanks to 35 and 70 MPa. Three different tank configurations are used, having volumes of 205, 130 and 39 liters. The filling time is 5 to 20 minutes. A governing equation for the filling process is proposed, which includes unknown values for heat transfer coefficients between the hydrogen and the wall and the wall and surrounding air. The values are tentatively assumed to be 500 W/(m2K) during filling and 250 W/(m2K) after filling for the inside tank wall and 4.5 W/(m2K) for the outside tank wall. The measured temperatures of the hydrogen gas and the wall are in good agreement with the calculated ones.

Choosing Working Fluid for Two-Phase Thermosyphon Systems for Cooling of Electronics

2003 ◽  
Vol 125 (2) ◽  
pp. 276-281 ◽  
Author(s):  
Bjo¨rn Palm ◽  
Rahmatollah Khodabandeh
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Heat Fluxes ◽  
Working Fluid ◽  
Air Cooling ◽  
Transfer Coefficients ◽  
Two Phase ◽  
Heat Transfer Coefficients ◽  
And Performance ◽  
Cooling Of Electronics

The heat fluxes from electronic components are steadily increasing and have now, in some applications, reached levels where air-cooling is no longer sufficient. One alternative solution, which has received much attention during the last decade, is to use heat pipes or thermosyphons for transferring or spreading the dissipated heat. In this paper two-phase thermosyphon loops are discussed. Especially, the choice of fluid and its influence on the design and performance is treated. The discussion is supported by results from simulations concerning heat transfer and pressure drop. In general it is found that high-pressure fluids will give better performance and more compact designs as high-pressure results in higher boiling heat transfer coefficients and smaller necessary tube diameter.

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