Experimental investigation of Multi-Mode heat transfer to a Free-Falling dilute particle cloud in a heated vertical tube

Umer, Muhammad; Siefering, Bryan J.; Fronk, Brian M.

doi:10.1016/j.expthermflusci.2024.111278

Experimental investigation of Multi-Mode heat transfer to a Free-Falling dilute particle cloud in a heated vertical tube

Journal Article · Fri Aug 02 00:00:00 EDT 2024 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/j.expthermflusci.2024.111278· OSTI ID:2479461

Umer, Muhammad ^[1]; Siefering, Bryan J. ^[2]; Fronk, Brian M. ^[2]

The Pennsylvania State University, University Park, PA (United States); The Pennsylvania State University
The Pennsylvania State University, University Park, PA (United States)

The development of dilute particle heat exchangers and reactors for advanced energy systems requires an understanding of the multi-mode heat transfer from a heated wall to falling particles. This study presents experimental results of the overall heat transfer coefficient for a free-falling, dilute flow of particles with solid volume fraction from 0.0005 to 0.006 corresponding to feed rates from 3.7 kg s^-1 m^-2 to 44 kg s^-1 m^-2 in a vertical, heated tube containing quiescent air at atmospheric pressure. Tube wall temperatures are varied between 300°C to 900°C while keeping the particle inlet temperature constant. The experimental results show that the overall heat transfer coefficient is a strong function of particle feed rate and surface temperature. Good agreement was obtained with prior studies conducted at comparable temperatures but lower particle feed rates (< 4 kg m^-2 s^-1). The established correlations for particle-to-wall radiation and particle-to-gas convection were used to estimate the wall-to-gas convective contribution from the measured overall heat transfer coefficient. The experimental results indicated a 4 to 6 times improvement in the wall convection in the solid-gas mixture compared to that expected from natural convection in a single-phase gas. Furthermore, the data presented here are applicable to characterize heat transfer in dilute particle heat exchangers, furnaces, and solar receivers.

View Accepted Manuscript (DOE)

Research Organization:: Arizona State University, Tempe, AZ (United States); The Pennsylvania State University, University Park, PA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008991

OSTI ID:: 2479461

Alternate ID(s):: OSTI ID: 2426410

Journal Information:: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Vol. 159; ISSN 0894-1777

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
25 ENERGY STORAGE
42 ENGINEERING
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Experimental investigation of Multi-Mode heat transfer to a Free-Falling dilute particle cloud in a heated vertical tube

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