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Natural convection heat transfer from complex surface

✍ Scribed by Witold M. Lewandowski; Jawad M. Khubeiz; Piotr Kubski; Henryk Bieszk; Tadeusz Wilczewski; Sławomir Szymański

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
946 KB
Volume
41
Category
Article
ISSN
0017-9310

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✦ Synopsis

The analytical solution of convective heat transfer from an isothermal complex surface in an unlimited space has been presented. The complex surface is represented by a horizontal ring of diameters D and d with hemispherical segment of diameter d in the centre. The shape of the complex surface was expressed by factor p = d/D. The presented solution has been verified experimentally on a set-up of diameter of 0.4 m and height of 0.5 m with surfaces of constant external diameter D = 0.06 m and various shape factor p = &round plate, 0.183, 0.233, 0.40, 0.483, 0.554, 0.650, 0.817 and l&-hemisphere.

The tested flmd was glycerine. The comparison of theoretical and experimental results gives good agreement.

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✍ Devanahalli G. Prabhanjan; Timothy J. Rennie; G.S. Vijaya Raghavan 📂 Article 📅 2004 🏛 Elsevier Science 🌐 French ⚖ 213 KB

An experimental investigation of the natural convection heat transfer from helical coiled tubes in water was performed. The outside Nusselt number was correlated to the Rayleigh number using different characteristic lengths. The relationship was based on a power law equation. The constants in the eq