Experiments in a single-phase natural circulation mini-loop

Misale, Mario; Garibaldi, P.; Passos, J.C.; Bitencourt, G. Ghisi de

doi:10.1016/j.expthermflusci.2006.11.004

Cited by 105 publications

(30 citation statements)

References 7 publications

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“…Both heater and cooler were thoroughly insulated. Experimental tests and CFD simulations [10] demonstrated that heat loss from the heater to the environment were lower than 5% of the total heat flux.…”

Section: Figurementioning

confidence: 99%

“…The internal temperature of the cryostat was also measured by thermocouple, and two thermocouples were positioned at the top and the bottom of the loop in order to check any changes in the room temperature. In addition, eighteen thermocouples were placed inside the heater insulation in order to investigate natural circulation phenomena in porous media [10]. Again, Fig.…”

Section: Figure 2 Thermocouples Sitingmentioning

confidence: 99%

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Assessment of a 2D CFD model for a single phase natural circulation loop

Borreani¹,

Chersola²,

Lomonaco³

et al. 2017

IJHT

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The use of passive safety systems are more and more diffused in many technological fields. Natural circulation is probably one of the main phenomenon applied in this kind of systems: indeed, as known, by means of gravity and buoyancy forces, the fluids can circulate without any external power sources. In this paper, a preliminary analysis (also by comparisons between experimental tests and numerical simulations) of a natural circulation based loop (namely a natural circulation based facility installed at University of Genova) is presented. Starting from some experimental results, the data deriving from CFD loop simulations (both in steady and in unsteady conditions) are used for a first preliminary validation, mainly in order to have a computational tool reliable and able to computationally simulate motion inversions related phenomena. The physical inversions phenomena are very well reproduced also by the a simplified numerical 2D model of the loop, and the physical considerations related to the temperature and velocity fluctuations during the transient simulations, are in agreement with the well-known observations formulated by Welander on the basis of a simple point source analysis scheme.

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Section: Figurementioning

confidence: 99%

Section: Figure 2 Thermocouples Sitingmentioning

confidence: 99%

Assessment of a 2D CFD model for a single phase natural circulation loop

Borreani¹,

Chersola²,

Lomonaco³

et al. 2017

IJHT

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“…The flow in the loop is namely caused by a difference of hydrostatic pressures between hot and cold branch [3]. By the subtracting of pipe losses from this difference we get the total pressure gradient available for overcoming of hydraulic losses in heat exchangers.…”

Section: Its Base Properties Are Followingmentioning

confidence: 99%

CFD Simulation of a Natural Circulation Helium Loop

Knížat¹,

Hlbocan²,

Mlkvik³

2015

Scientific Proceedings Faculty of Mechanical Engineering

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“…There have been a number of previous experimental and theoretical studies on the natural circulation loop [2][3][4][5][6]. Most of them have mainly reported the fundamental thermo-fluid problem using water as a working fluid.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on natural circulation using liquid nitrogen for superconducting applications

Choi¹

2013

Progress in Superconductivity and Cryogenics

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An experiment to investigate the natural circulation of a cryogen has been performed. The study is motivated mainly by our recent development of cryogenic cooling system for prototype superconducting cyclotron without any circulating pump. In the natural circulation loop system, a cooling channel is attached on the outer surface of the aluminium block and the liquid nitrogen passes through inside of the channel to cool the block indirectly. A cryocooler as a heat sink is located at the top to re-condense cryogenic vapor coming from the aluminium block in which electrical heater is installed as a heat source. The main dimensions are determined using the relevant analysis and the natural circulation loop is successfully fabricated. The temperature distributions in the loop are measured during initial cool-down process and in steady state, from which the modified Grashof numbers are calculated and compared with the existing correlation estimated with one-dimensional analysis for steady state flow.

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Experiments in a single-phase natural circulation mini-loop

Cited by 105 publications

References 7 publications

Assessment of a 2D CFD model for a single phase natural circulation loop

Assessment of a 2D CFD model for a single phase natural circulation loop

CFD Simulation of a Natural Circulation Helium Loop

Experimental study on natural circulation using liquid nitrogen for superconducting applications

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