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International Heat Transfer Conference 8

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Experimental Study of Mixed Convection in Horizontal Annuli for Low Reynolds Numbers

M. Ciampi
Dipartimento di Energetica, Universita di Pisa, Italy

Sergio Faggiani
Dipartimento di Energetica, Universita degli Studi di Pisa

Walter Grassi
Lo.Th.A.R. (Low gravity and Thermal Advanced Research Laboratory), DESTEC (Department of Energy, Systems, Territory and Constructions Engineering), University of Pisa−Largo Lucio Lazzarino, 56122 Pisa, Italy

Frank P. Incropera
School of Mechanical Engineering, Purdue University, Indiana, U.S.A.; University of Notre Dame

G. Tuoni
Dipartimento di Energetica, Universita di Pisa, Italy


An experimental study has been conducted to determine thermal conditions in laminar, water flow between co-axial cylinders with heat flux from the inner surface. Temperature measurements reveal strong enhancement of the heat transfer coefficient due to a buoyancy driven secondary flow. A mix ed convection correlation is developed for 200≤Re≤2200 and 4.4×106≤Ra*≤1.6×l09. Emphasis is placed on determining the angular dependence of the Nusselt number.

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