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Research Papers

Single-Phase Flow Analysis: An Attempt to Mitigate Particle Deposition on the Glass Window of a Fluidized Bed Solar Receiver

[+] Author and Article Information
M. Shahabuddin

The School of Mechanical Engineering,
The University of Adelaide,
Adelaide, SA 5005, Australia
e-mail: shahabuddin.suzan1@gmail.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received August 5, 2015; final manuscript received March 9, 2016; published online April 19, 2016. Assoc. Editor: Nesrin Ozalp.

J. Sol. Energy Eng 138(4), 041004 (Apr 19, 2016) (9 pages) Paper No: SOL-15-1250; doi: 10.1115/1.4033068 History: Received August 05, 2015; Revised March 09, 2016

The problem of particle deposition on the glass window of a solar receiver has restricted its continuous operation by reducing solar radiation transmission. A rigorous attempt has been made in this analysis by exploring the understanding of particle deposition mechanisms and their mitigating strategies. A simplified form of a fluidized bed solar receiver (FBSR) having the same flow phenomena of FBSR is chosen for the numerical analysis. In the numerical analysis, the turbulent flow in the receiver is investigated by renormalized group (RNG) theory based k–ε models. The validation of the numerical model is carried out by measuring the turbulent flow properties using a turbulent flow instrumentation (TFI) Cobra probe. The results of this analysis revealed that mass flow into the secondary concentrator of the receiver was reduced significantly when the ratio between the outlets and inlet areas was 0.5, and the ratio between the aperture and receiver diameter was 0.41. When using window shielding jets, only 5% of the inlet mass as a window jet was sufficient to prevent any particle deposition on the glass window, however, the number of jets was found to be an important factor. At a constant mass flow rate, increasing the number of window shielding jets reduced the suction pressure from the core to the aperture, which helped to restrict the inlet flow in the secondary concentrator.

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Figures

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Fig. 1

Cross section of the modeled geometry (dimensions are in millimeter)

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Fig. 2

Mesh distribution for the upper part of the receiver

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Fig. 3

Solution procedures for numerical simulation

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Fig. 4

Experimental arrangement for measuring flow properties

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Fig. 5

Typical total velocity measurement using Cobra probe

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Fig. 6

Axial velocity versus radial position at axial location y = 1766 mm

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Fig. 7

Axial velocity versus radial position at axial location y = 1886 mm

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Fig. 8

Mean velocity versus radial position using different Reynolds numbers: (a) 18,000 and (b) 26,000

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Fig. 9

Axial velocity versus radial position at axial location y = 1826 mm, using the window shielding jets for Re = 26,000

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Fig. 10

Color map of the axial velocity at aperture section: (a) Re = 18,000, (b) Re = 22,000, and (c) Re = 26,000

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Fig. 11

Effect of outlet diameters on the normalized mass flow rate at the aperture section when the outlets are placed at y/d = 13, 14, and 15

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Fig. 12

Normalized mass flow rate at the aperture section when the outlets are placed at y/d = 15

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Fig. 13

Normalized mass flow rate in the CPC with respect to different Aout/Ain ratios and the number of jets

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Fig. 14

Normalized mass flow in the CPC and the mean velocity at the aperture with respect to aperture diameter

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Fig. 15

The mean velocity vector without jet condition: (a) the bottom part, (b) the middle part, and (c) the CPC

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Fig. 16

The total velocity vector using outlet diameter of 30 mm: (a) 5% of the inlet mass using two jets and (b) 5% of the inlet mass using four jets

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