Experimental study on heat transfer characteristics between spherical solid particles and cylindrical surfaces
This study experimentally investigates heat transfer between corundum particles (1–3 mm) and cylindrical surfaces. Results show that reducing particle diameter from 3 mm to 1 mm increases the heat transfer coefficient by 50–100 W m−2 K−1. A 100 °C rise in wall temperature enhances the coefficient by...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-08-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25007014 |
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| Summary: | This study experimentally investigates heat transfer between corundum particles (1–3 mm) and cylindrical surfaces. Results show that reducing particle diameter from 3 mm to 1 mm increases the heat transfer coefficient by 50–100 W m−2 K−1. A 100 °C rise in wall temperature enhances the coefficient by ∼26 W m−2 K−1. Critical relative motion velocities (Vcr) are identified as 0.09 m/s (1 mm), 0.06 m/s (2 mm), and 0.03 m/s (3 mm). Below Vcr velocity boosts coefficients by up to 35 %, while effects diminish above Vcr (<5 % variation). Two dimensionless correlations are proposed: Nu=2.02×10−2+1.25×10−3T∗ (82.4 % data within ±20 % error for V > Vcr) and Nu=2.30×10−2+7.49×10−4T∗−3.11×10−2∗Fr2∗Ln(Fr) (94 % accuracy for V < Vcr), providing reliable tools for industrial waste heat recovery design. |
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| ISSN: | 2214-157X |