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Experimental and numerical study of free convective heat transfer in air performed simultaneously from the upper and lower surfaces of a horizontal plate heated on both sides
Abstrakt
This paper presents an experimental study, supported by numerical analysis, on convective heat transfer in air from a newly designed, horizontal, double-sided heated Type II plate. Unlike the single-sided heated Type I plate, where the heating surface faces either upwards or downwards, the Type II plate heats both surfaces simultaneously. The tested plate was constructed from three glued laminates, each 0.6 mm thick, resulting in a total thickness of 2.1 mm. Minimal lateral-surface heat loss (<4.2%) ensured high measurement accuracy. Surface resistance thermometers (Tlow/up) were etched into the copper layer on one side, while two resistance heaters (Nlow/up) were embedded in the copper-coated middle laminate. Numerical calculations (Num.II and Num.I) for Type II and I plates revealed discrepancies under the UWT (Uniform Wall Temperature) condition: CExp.II/CNum.II = 33.8% (upper) and -8.4% (lower), and for UHF (Uniform Heat Flux): 17.8% (upper) and 6.1% (lower). Similar discrepancies in CNum.II/ CNum.I (-36.1% UWTup, 0.5% UWTlow, -26.9% UHFup, 0.7% UHFlow) confirmed different heat transfer mechanisms on the upper heating surfaces of Type II and I plates. In the absence of the mean literature correlation (MLC.II) for Type II plates, numerical verification (CNum.II) was conducted, yielding CExp./CNum.II = 1.338 (upper) and 0.916 (lower) for UWT, and 1.178 (upper) and 1.061 (lower) for UHF. Indirect verification using Type I plate data (MLC.I) required numerical transformation, yielding CExp.II/CMLC.I = 1.426 (upper) and 0.748 (lower) for UWT, and 1.017 (upper) and 0.896 (lower) for UHF. These results confirm the reliability of the Type II plate tests.
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- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuły w czasopismach
- Opublikowano w:
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INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
nr 245,
ISSN: 0017-9310 - Język:
- angielski
- Rok wydania:
- 2025
- Opis bibliograficzny:
- Ryms M., Tesch K., Lewandowski W.: Experimental and numerical study of free convective heat transfer in air performed simultaneously from the upper and lower surfaces of a horizontal plate heated on both sides// INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER -Vol. 245, (2025), s.126973-
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.ijheatmasstransfer.2025.126973
- Źródła finansowania:
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- Publikacja bezkosztowa
- Weryfikacja:
- Politechnika Gdańska
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