The working principle of particle-based solar receivers is to utilize the absorptivity of a dispersed particle phase in an otherwise optically transparent carrier fluid. In comparison to their traditional counterparts, which use a solid surface for radiation absorption, particle-based receivers offer a number of opportunities for improved efficiency and heat transfer uniformity. The physical phenomena at the core of such receivers involve coupling between particle transport, fluid turbulence, and radiative heat transfer. Previous analyses of particle-based solar receivers ignored delicate aspects associated with this three-way coupling. Namely, these investigations considered the flow fields only in the mean sense and ignored turbulent fluctuations and the consequent particle preferential concentration. In the present work, we have performed three-dimensional direct numerical simulations of turbulent flows coupled with radiative heating and particle transport over a range of particle Stokes numbers. Our study demonstrates that the particle preferential concentration has strong implications on the heat transfer statistics. We demonstrate that “for a typical setting” the preferential concentration of particles reduces the effective heat transfer between particles and the gas by as much as 25%. Therefore, we conclude that a regime with Stokes number of order unity is the least preferred for heat transfer to the carrier fluid. We also provide a 1D model to capture the effect of particle spatial distribution in heat transfer.

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Center for Turbulence Research,

Department of Mechanical Engineering,

Stanford University,

Stanford, CA 94305

e-mail: hadip@stanford.edu
Center for Turbulence Research,

Department of Mechanical Engineering,

Stanford University,

Stanford, CA 94305

e-mail: alimani@stanford.edu
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 July 21, 2016; final manuscript received November 2, 2016; published online November 29, 2016. Assoc. Editor: Nesrin Ozalp.

Theoretical Analysis and Photothermal Experimental Study of a Segmented Specular Reflection Solar Concentrator

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April 2017

Research-Article

# Effects of Preferential Concentration on Heat Transfer in Particle-Based Solar Receivers

Hadi Pouransari,

Hadi Pouransari

Center for Turbulence Research,

Department of Mechanical Engineering,

Stanford University,

Stanford, CA 94305

e-mail: hadip@stanford.edu

Department of Mechanical Engineering,

Stanford University,

Stanford, CA 94305

e-mail: hadip@stanford.edu

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Ali Mani

Ali Mani

Center for Turbulence Research,

Department of Mechanical Engineering,

Stanford University,

Stanford, CA 94305

e-mail: alimani@stanford.edu

Department of Mechanical Engineering,

Stanford University,

Stanford, CA 94305

e-mail: alimani@stanford.edu

Search for other works by this author on:

Hadi Pouransari

Department of Mechanical Engineering,

Stanford University,

Stanford, CA 94305

e-mail: hadip@stanford.edu

Ali Mani

Department of Mechanical Engineering,

Stanford University,

Stanford, CA 94305

e-mail: alimani@stanford.edu

*J. Sol. Energy Eng*. Apr 2017, 139(2): 021008 (11 pages)

**Published Online:**November 29, 2016

Article history

Received:

July 21, 2016

Revised:

November 2, 2016

Citation

Pouransari, H., and Mani, A. (November 29, 2016). "Effects of Preferential Concentration on Heat Transfer in Particle-Based Solar Receivers." ASME. *J. Sol. Energy Eng*. April 2017; 139(2): 021008. https://doi.org/10.1115/1.4035163

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