Heat Exchange Characteristics in Heat Supply and Heat Removal Parts of a Nonisothermal Circuit, Including Temperature and Velocity Fields in a HLMC Flow, for Controlled Impurity Content

2009 ◽  
Author(s):  
O. O. Novozhilova ◽  
A. V. Beznosov ◽  
S. Yu. Savinov ◽  
M. A. Antonenkov
Keyword(s):  
Heat Exchange ◽  
Oxygen Content ◽  
Velocity Structure ◽  
Experimental Studies ◽  
Heat Removal ◽  
Impurity Content ◽  
Stream Velocity ◽  
Carrier Stream ◽  
Temperature And Velocity Fields ◽  
Annular Clearance

Results of the experimental studies of the heat exchange to the lead heat-transfer agent in the annular clearance in the circulation contour with the controlled and operated processes of mass exchange and mass transfer of the oxygen content are presented. And results of experimental research of lead-bismuth heat-carrier stream velocity structure at a varied content of oxygen content are presented.

Combined Characteristics of MHD Resistance and Heat Exchange in a HLMC Flow in a Transverse Magnetic Field

2009 ◽  
Author(s):  
S. Yu. Savinov ◽  
A. V. Beznosov ◽  
O. O. Novozhilova ◽  
M. A. Antonenkov
Keyword(s):  
Magnetic Field ◽  
Velocity Structure ◽  
Experimental Studies ◽  
Transverse Magnetic ◽  
Thermodynamic Activity ◽  
Stream Velocity ◽  
Experimental Part ◽  
Carrier Stream ◽  
Coolant Velocity ◽  
Content Of Oxygen

Results of experimental research of lead-bismuth heat-carrier stream velocity structure in the cross-section magnetic field at a varied content of oxygen admixture and characteristics of oxide electroinsulating covers are presented. Experimental studies were carried out for the following operation parameters: the lead-bismuth eutectics temperature T = 400–420 °C; thermodynamic activity of oxygen in the coolant a = 10−4–100; the eutectics flow rate through the experimental part Q = 1.8–3.0 m3/h, the coolant velocity in the experimental part w = 1.0–1.7 m/s; the magnetic induction value B = 0–0.85 T; the Reynolds number Re = (1,6–2,7)·105; the Peclet number Pe = 320–4600, and the Hartmann number Ha = 0–365.

Experimental Studies of Thermal Hydraulics of a HLMC Flow Around Heat Exchange Surfaces

2013 ◽  
Author(s):  
Mikhail Iarmonov ◽  
Olga Novozhilova ◽  
Pavel Bokov ◽  
A. V. Beznosov
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Exchange ◽  
Experimental Studies ◽  
Velocity Fields ◽  
Operating Conditions ◽  
Coolant Flow ◽  
Oxygen Impurity ◽  
Lead Coolant ◽  
Temperature And Velocity Fields

Temperature and velocity fields in high-temperature lead coolant flows in a circular clearance for controlled oxygen impurity content in a flow were experimentally studied at the Nizhny Novgorod State Technical University by R.E. Alekseev (NNSTU). Temperature and velocity fields were simultaneously studied in “cold” and “hot” parts of the circuit in the following operating conditions: the lead temperature is t = 400–550 °C, the thermodynamic activity of oxygen is a = 10−5–100; the Peclet number is Pe = 500–7000, the coolant flow velocity is w = 0.1–1.5 m/s, and the average heat flux is q = 50–160 kW/m2. It has been found that the oxygen impurity content and characteristics of protective oxide coatings affect temperature and velocity fields in round and circular channels. This is due to the fact that oxygen in a coolant and oxide coatings on the surfaces limiting a liquid metal flow influence characteristics of the wall boundary region. The heat transfer process that occurs when HLMC transversely flows around heat exchange pipes is investigated now at the NNSTU. The experimental facility is a combination of two high-temperature liquid-metal stands, i.e., FT-2 with the lead coolant and FT-1 with the lead-bismuth coolant combined with an experimental section. The temperature of a heat-exchange surface is measured by thermocouples of diameter 1 mm mounted in walls of heat-exchange pipes. Velocity and temperature fields in a high-temperature HLMC flow are measured by special sensors placed in the flow cross section between rows of heat-exchange pipes. Heat transfer characteristics and temperature and velocity fields in a high-temperature lead coolant flow are studied in the following operating conditions: the lead temperature is t = 450–500 °C, the thermodynamic activity of oxygen is a = 10−5–100, and the coolant flow rate through the experimental setup is Q = 3–6 m3/h, which corresponds to coolant flow velocities of V = 0.4–0.8 m/s. Integrated experimental studies of characteristics of the heat transfer that occurs when the lead coolant transversely or obliquely flows around pipes have been carried out for the first time and the dependences Nu = f(Pe) for controlled content of thermodynamically active oxygen impurity and sediments of impurities have been obtained. It is assumed that the obtained experimental data on distribution of velocity and temperature fields in a HLMC flow will permit to study heat transfer processes and to use them for developing program codes for engineering calculations of heat exchange surfaces (steam generators) with a HLMC flow around them.

Novel Lightweight Metal Foam Heat Exchangers

2001 ◽  
Author(s):  
David P. Haack ◽  
Kenneth R. Butcher ◽  
T. Kim ◽  
T. J. Lu
Keyword(s):  
Heat Exchange ◽  
Pore Size ◽  
Heat Exchangers ◽  
Metal Foam ◽  
Heat Removal ◽  
Random Orientation ◽  
Flow Rates ◽  
Small Pore ◽  
Complex Heat Exchange ◽  
Flow Through

Abstract An overview of open cell metal foam materials with application to advanced heat exchange devices is presented. The metal foam materials considered consist of interconnected cells in a random orientation. Metal foam materials, manufacture and fabrication into complex heat exchange components are described. Experiments with flat foam panels brazed to copper sheets shows increasing heat removal effectiveness with decreasing product pore size at equivalent coolant flow rates. However, the high-pressure drop associated with flow through small pore-size material makes the use of larger pore size material more attractive.

scholarly journals Analytical and experimental studies into the processes of hydrodynamics and heat exchange in the channels of disk pulse devices

2019 ◽  
Vol 4 (8 (100)) ◽  
pp. 15-23
Author(s):  
Valeriy Nikolsky ◽  
Ivan Kuzyayev ◽  
Oleksandr Alieksandrov ◽  
Viktor Ved ◽  
Andrii Pugach ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Experimental Studies

scholarly journals Hydrodynamics and heat exchange of crystal pulling from melts. Part I: Experimental studies of free convection mode

2019 ◽  
Vol 5 (3) ◽  
pp. 91-100
Author(s):  
Vladimir S. Berdnikov
Keyword(s):  
Heat Exchange ◽  
Convective Heat ◽  
Capillary Flow ◽  
Crystallization Front ◽  
Experimental Studies ◽  
Convective Heat Exchange ◽  
Czochralski Technique ◽  
Study Results ◽  
Front Shape ◽  
Prandtl Numbers

This work is a brief overview of experimental study results for hydrodynamics and convective heat exchange in thermal gravity capillary convection modes for the classic Czochralski technique setup obtained at the Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences. The experiments have been carried out at test benches which simulated the physics of the Czochralski technique for 80 and 295 mm diameter crucibles. Melt simulating fluids with Prandtl numbers Pr = 0.05, 16, 45.6 and 2700 have been used. Experiments with transparent fluids have been used for comparing the evolution of flow structure from laminar mode to well-developed turbulent mode. Advanced visualization and measurement methods have been used. The regularities of local and integral convective heat exchange in the crucible/melt/crystal system have been studied. The experiments have shown that there are threshold Grashof and Marangoni numbers at which the structure of the thermal gravity capillary flow undergoes qualitative changes and hence the regularities of heat exchange in the melt change. The effect of melt hydrodynamics on the crystallization front shape has been studied for Pr = 45.6. Crystallization front shapes have been determined for the 1 × 105 to 1.9 × 105 range of Grashof numbers. We show that the crystallization front shape depends largely on the spatial flow pattern and the temperature distribution in the melt.

Key Results of Computational and Experimental Studies of Passive Systems of Emergency Heat Removal

Atomic Energy ◽  
2019 ◽  
Vol 125 (3) ◽  
pp. 165-171
Author(s):  
A. M. Bakhmet’ev ◽  
M. A. Bol’shukhin ◽  
M. A. Kamnev ◽  
A. M. Khizbullin ◽  
A. N. Sokolov
Keyword(s):  
Experimental Studies ◽  
Heat Removal ◽  
Passive Systems

Experimental studies of heat exchange for sodium boiling in the fuel assembly model: Safety substantiation of a promising fast reactor

2017 ◽  
Vol 64 (1) ◽  
pp. 6-14 ◽  
Author(s):  
R. R. Khafizov ◽  
V. M. Poplavskii ◽  
V. I. Rachkov ◽  
A. P. Sorokin ◽  
A. A. Trufanov ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Fuel Assembly ◽  
Fast Reactor ◽  
Experimental Studies ◽  
Assembly Model
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