Numerical and experimental studies of the natural circulation mode during commissioning of Unit-1 Novovoronezh NPP-2

Kerntechnik ◽  
2020 ◽  
Vol 85 (4) ◽  
pp. 257-264
Author(s):  
Yu. V. Saunin ◽  
D. V. Markin ◽  
A. N. Dobrotvorski ◽  
A. V. Kotsarev ◽  
V. V. Egorov
Keyword(s):  
Natural Circulation ◽  
Experimental Studies ◽  
Circulation Mode

Performance Comparison of Flat Plate Collectors Fitted With Non Circular Risers With Integral Fins

2005 ◽  
Author(s):  
V. R. Bhore ◽  
S. B. Thombre
Keyword(s):  
Flat Plate ◽  
Unit Area ◽  
Natural Circulation ◽  
Performance Comparison ◽  
Test Results ◽  
Absorber Plate ◽  
Circulation Mode ◽  
Induced Flow ◽  
Flat Plate Collector ◽  
Buoyancy Induced Flow

The present study deals with comparison of experimentally determined performance characteristics of solar flat plate collectors fitted with novel designs of absorber plate involving non-circular risers with integral fins and operating under natural circulation mode. The main flow passages considered were square, triangular and semicircular in cross section. One standard solar flat plate collector with circular risers was also tested simultaneously for direct comparison. The test results indicate that the absorber fitted with the triangular sectioned risers yields the best performance in terms of the efficiency (63%), and the buoyancy induced flow per unit area (76 kg/hr-m2) from amongst the collectors investigated. It is followed by the absorbers fitted with the semicircular and square sectioned risers respectively. The standard solar flat plate collector is found to yield the lowest values i.e. 46 % and 40 kg/hr-m2 respectively.

Experimental studies in a single-phase parallel channel natural circulation system: preliminary results

Kerntechnik ◽  
2016 ◽  
Vol 81 (1) ◽  
pp. 67-73 ◽  
Author(s):  
K. Bodkha ◽  
D. S. Pilkhwal ◽  
S. S. Jana ◽  
P. K. Vijayan
Keyword(s):  
Single Phase ◽  
Natural Circulation ◽  
Experimental Studies ◽  
Circulation System ◽  
Parallel Channel ◽  
Preliminary Results

scholarly journals E203 Experimental Studies of Natural Circulation Decay Heat Removal in Japan Sodium Cooled Fast Reactor (JSFR)

2009 ◽  
Vol 2009.14 (0) ◽  
pp. 427-428
Author(s):  
Hideki KAMIDE ◽  
Hiroyuki MIYAKOSHI ◽  
Osamu WATANABE ◽  
Yuzuru EGUCHI ◽  
Tomonari KOGA
Keyword(s):  
Fast Reactor ◽  
Natural Circulation ◽  
Experimental Studies ◽  
Heat Removal ◽  
Decay Heat

scholarly journals Possibility of simulating natural circulation in fast neutron reactors using a light water test facility

2021 ◽  
Vol 7 (4) ◽  
pp. 349-355
Author(s):  
Viktor I. Slobodchuk ◽  
Dmitry A. Uralov ◽  
Ekaterina A. Avramova
Keyword(s):  
Fast Neutron ◽  
Natural Circulation ◽  
Thermal Power ◽  
Experimental Studies ◽  
Test Facility ◽  
Model Parameters ◽  
Reactor Facility ◽  
Light Water ◽  
Water Test ◽  
Neutron Reactor

The paper evaluates the possibility of modeling the heat transfer phenomena in a liquid-metal coolant using a light water test facility. It considers the natural circulation of the coolant in the upper plenum of the fast-neutron reactor. The sodium-cooled BN-1200 reactor was selected as the reactor installation to be modeled. The development of novel reactor designs must be based on the results of experimental studies. Some problems of modeling thermohydraulic processes in BN type reactors are studied by using sodium test facilities. Experimental studies of natural convection processes using light water test facilities can be considered as a good alternative to those using sodium test facilities. To validate the model, the similarity theory and the “black box” method were used and their principles and applicability were analyzed. Using the “black box” method makes it possible to avoid detailed modeling of such components as the reactor core and heat exchangers, replacing them by a simplified representation of these components to simulate the integral characteristics of the existing real life equipment. The paper considers the basic criteria which determine the similarity of the thermohydraulic processes under study. The governing criteria of similarity were estimated based on the fundamental differential equations of natural convection heat transfer. Based on these criteria, a set of dimensionless values was obtained which show the correlation between the model parameters and the characteristics of the reactor facility. Besides, generalized relationships were derived which can be used to estimate the scaling factors for calculating the key values of the reactor facility based on the model parameters. These relationships depend on the thermal-physics parameters of the working fluids, the geometrical scale value and the ratio of the thermal power of the model to that of the reactor facility, i.e., model-to-reactor thermal power ratio. The conditions under which it is possible to model sodium coolant by light water with adequate accuracy were analyzed. An example is given of the numerical values of the scaling factors for one of the reference light water test facilities. The paper uses the experience of a number of foreign researchers in this field, in particular, the accepted assumptions which do not result in serious loss in modeling accuracy. According to the available estimates, the assumptions used do not result in considerable losses in accuracy. Thus, the natural circulation of the sodium coolant in the upper plenum of the fast-neutron reactor can be simulated with adequate accuracy by using light water test facilities.

An experimental study of a single-slope solar still with innovative side-troughs under natural circulation mode

Desalination ◽  
2017 ◽  
Vol 422 ◽  
pp. 174-181 ◽  
Author(s):  
Mohammad Ali Pakdel ◽  
Mahdi Hedayatizadeh ◽  
Seyed Mahmoud Tabatabaei ◽  
Naser Niknia
Keyword(s):  
Experimental Study ◽  
Natural Circulation ◽  
Solar Still ◽  
Circulation Mode
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