Research Papers

Particle Deposition by Thermophoresis Under High-Temperature Conditions in a Helium Flow

[+] Author and Article Information
Felix Fischer

Chair of Hydrogen and Nuclear Energy,
Institute of Power Engineering,
Technische Universität Dresden,
Dresden 01062, Germany
e-mail: felix.fischer@tu-dresden.de

Andreas Andris

Chair of Hydrogen and Nuclear Energy,
Institute of Power Engineering,
Technische Universität Dresden,
Dresden 01062, Germany
e-mail: andreas.andris@tu-dresden.de

Wolfgang Lippmann

Chair of Hydrogen and Nuclear Energy,
Institute of Power Engineering,
Technische Universität Dresden,
Dresden 01062, Germany
e-mail: wolfgang.lippmann@tu-dresden.de

Antonio Hurtado

Chair of Hydrogen and Nuclear Energy,
Institute of Power Engineering,
Technische Universität Dresden,
Dresden 01062, Germany
e-mail: antonio.hurtado@tu-dresden.de

1Corresponding author.

Manuscript received November 6, 2017; final manuscript received July 16, 2018; published online September 10, 2018. Assoc. Editor: Juan-Luis Francois.

ASME J of Nuclear Rad Sci 4(4), 041020 (Sep 10, 2018) (7 pages) Paper No: NERS-17-1289; doi: 10.1115/1.4040936 History: Received November 06, 2017; Revised July 16, 2018

The continuous generation of graphite dust particles in the core of a high-temperature reactor (HTR) is one of the key challenges of safety during its operation. The graphite dust particles emerge from relative movements between the fuel elements or from contact to the graphitic reflector structure and could be contaminated by diffused fission products from the fuel elements. They are distributed from the reactor core to the entire reactor coolant system. In case of a depressurization accident, a release of the contaminated dust into the confinement is possible. In addition, the contaminated graphite dust can decrease the life cycle of the coolant system due to chemical interactions. On one hand, the knowledge of the behavior of graphite dust particles under HTR conditions using helium as the flow medium is a key factor to develop an effective filter system for the discussed issue. On the other hand, it also provides a possibility to access the activity distribution in the reactor. The behavior can be subdivided into short-term effects like transport, deposition, remobilization and long-term effects like reactions with material surfaces. The Technische Universität Dresden has installed a new high-temperature test facility to study the short-term effects of deposition of graphite dust particles. The flow channel has a length of 5 m and a tube diameter of 0.05 m. With helium as the flow medium, the temperature can be up to 950 °C in the channel center and 120 °C on the sample surface, the Reynolds number can be varied from 150 up to 1000. The particles get dispersed into the accelerated and heated flow medium in the flow channel. Next, the aerosol is passing a 3 m long adiabatic section to ensure homogenous flow conditions. After passing the flow straightener, it enters the optically accessible measurement path made from quartz glass. In particular, this test facility offers the possibility to analyze the influence of the thermophoretic effect separately. For this, an optionally cooled sample can be placed in the measuring area. The thickness of the particle layer on the sample is estimated with a three-dimensional laser scanning microscope. The particle concentration above the sample is measured with an aerosol particle sizer (APS). Particle image velocimetry (PIV) detects the flow-velocity field and provides data to estimate the shear velocity. In combination with the measured temperature-field, all necessary information for the calculation of the particle deposition and particle relaxation times are available. The measurements are compared to results of theoretical works from the literature. The experimental database is relevant especially for computational fluid dynamics (CFD)-developers, for model development, and model verification. A wide range of phenomena like particle separation, local agglomeration of particles with a specific particle mass, and selective remobilization can be explained in this way. Thus, this work contributes to a realistic analysis of nuclear safety.

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Fig. 1

Particle deposition models with and without thermophoresis [15,16] along with collected experimental data from Papavergos and Hedley [17] using the nondimensional particle relaxation time and the nondimensional particle deposition velocity

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Fig. 2

Schematic drawing of test facility DD-TUBE

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Fig. 3

(a) Sample area with two samples, the quartz glass plate on the left, the thermocouple holder on the right and the sample holder on the bottom and (b) sketch of the sample area including the flow direction and the cooling concept

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Fig. 4

Cumulative particle size distribution of dust found in the AVR [25] and in the THTR [26] opposed to the graphite particles used in the helium loop DD-TUBE

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Fig. 5

Temperature field above the sample with data from seven thermocouples and Tw (h0 = 0) = 117.5 °C calculated from the thermocouple 2 mm beneath the sample

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Fig. 6

Flow field estimated via cross correlation from the PIV double frame images and fit on the lower angle of the flow pattern

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Fig. 7

(a) edited image of the combined light microscope picture and the elevation profile and (b) all particles counted are presented in black after analysis via imagej [29]

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Fig. 8

Cumulative particle size distribution of graphite particle found on the sample and measured before dispersing in the helium loop

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Fig. 9

Particle deposition with and without thermophoresis [16] edited with operating point of the presented helium loop



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